Characteristic differences in meristem organization have been related to taxonomic groups. Terms for developmental zones formation are available in the obsolete node, and they will be reintroduced in the ontology when there is a specific user request for them.

has super-classes: root development stage^c

2.00 main shoot only^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007061

2.01 main shoot and axillary shoots visible at one node stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007087

has super-classes: 2 formation of axillary shoot stage^c

2.02 main shoot and axillary shoots visible at two nodes stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007071

The axillary shoot can be a single shoot or a pair of axillary shoots at each node.

has super-classes: 2 formation of axillary shoot stage^c

2.03 main shoot and axillary shoots visible at three nodes stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007080

The axillary shoot can be a single shoot or a pair of axillary shoots at each node.

has super-classes: 2 formation of axillary shoot stage^c

2.04 main shoot and axillary shoots visible at four nodes stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007088

The axillary shoot can be a single shoot or a pair of axillary shoots at each node.

has super-classes: 2 formation of axillary shoot stage^c

2.05 main shoot and axillary shoots visible at five nodes stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007093

The axillary shoot can be a single shoot or a pair of axillary shoots at each node.

has super-classes: 2 formation of axillary shoot stage^c

2.06 main shoot and axillary shoots visible at six nodes stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007118

The axillary shoot can be a single shoot or a pair of axillary shoots at each node.

has super-classes: 2 formation of axillary shoot stage^c

2.07 main shoot and axillary shoots visible at seven nodes stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007122

The axillary shoot can be a single shoot or a pair of axillary shoots at each node.

has super-classes: 2 formation of axillary shoot stage^c

2.08 main shoot and axillary shoots visible at eight nodes stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007077

The axillary shoot can be a single shoot or a pair of axillary shoots at each node.

has super-classes: 2 formation of axillary shoot stage^c

2.09 main shoot and axillary shoots visible at nine or more nodes stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007110

The axillary shoot can be a single shoot or a pair of axillary shoots at each node.

has super-classes: 2 formation of axillary shoot stage^c

3 branch formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007059

has super-classes: leaf trichome development stage^c

3 establishment of tissue systems stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007525

has super-classes: root development stage^c
has sub-classes: root cap formation stage^c, root cortex differentiation stage^c, root epidermal differentiation stage^c, root vascular cylinder differentiation stage^c

3 rapid growth stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007004

Many stages like leaf production PO:0007112, axillary shoot formation PO:0007073, inflorescence PO:0007047 often overlap with this stage

4 growth directionality stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007135

has super-classes: leaf trichome development stage^c

4 root elongation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001031

In some plant species this stage is subdivided into distal and proximal elongating zones.

has super-classes: root development stage^c
has sub-classes: root emergence stage^c

5 root hair formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007519

has super-classes: root development stage^c

5.02 20% of inflorescence emerged.^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007075

5.04 40% of inflorescence emerged^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007102

5.06 60% of inflorescence emerged^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007105

5.08 80% of inflorescence emerged^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007107

6.01 10% of flowers open^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007121

6.03 30% of flowers open^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007124

6.04 40% of flowers open^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007125

7-8 fruit formation and maturation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007035

We have chosen to use fruit size as a marker of these physiological processes to represent the whole plant growth stage.

7.02 fruit size 20%^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007126

7.04 fruit size 40%^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007127

7.06 fruit size 60%^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007128

7.08 fruit size 80%^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007129

A archesporial cells visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001005

has super-classes: anther development stage^c

A megaspore mother cell enlarges stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007623

has super-classes: megagametophyte development stage^c

A microsporogenous mass stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001011

has super-classes: pollen development stage^c

A1 root initials formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007535

Endogenously formed embryonic roots are exclusive to Poaceae. This term has been obsoleted to keep the structure simple.

A2 root initials differentiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007512

Crown root stages are based on rice plant. This term has been obsoleted to keep the structure simple.

A2.1 root intials differntiation of primary roots^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007503

This term has been obsoleted to keep the structure simple.

A2.2 root initials differentiation of lateral roots^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007528

This term has been obsoleted to keep the structure simple.

A2.3 founder cell derivatives of lateral root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007530

This term has been obsoleted to keep the structure simple.

A2.4 root initials differentiation of crown roots^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007534

Crown root stages are based on rice plant. This term has been obsoleted to keep the structure simple.

abaxial nucellar projection^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008009

has super-classes: portion of plant tissue^c; part_of^op some nucellar projection^c

abaxial petiole canal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025238

has super-classes: petiole canal^c

abaxial protoderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006082

has super-classes: protoderm^c

abscission zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000146

has super-classes: portion of plant tissue^c
has sub-classes: floral organ abscission zone^c, flower pedicel abscission zone^c, fruit abscission zone^c, fruit pedicel abscission zone^c, leaf abscission zone^c

accessory paraclade^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025546

has super-classes: second order inflorescence axis^c

accessory transfusion tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006086

Not in current literature.

achene fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030107

Plant structures commonly referred to as ‘accessory’ (such as strawberry) or multiple fruits (such as figs..) which are comprised of accrescent receptacle (PO:0009064) or infructescence (PO:0006342) tissue, contain as parts achene fruits (PO:0030107). For example, when annotating for a gene involved in strawberry development, any gene of interest that is involved in the development of the receptacle tissue would be mapped to receptacle (PO:0009064); genes involved in sepal (PO:0009031) persistence or accrescence would map to sepal (PO:0009031), and those involved in fruit characteristics would be mapped to achene (PO:0030107). Examples: sunflower (Helianthus annuus), strawberry (Fragaria spp.), fig (Ficus sp.), and marijuana (Cannabis sativa).

has super-classes: fruit^c

adaxial nucellar projection^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008010

has super-classes: portion of plant tissue^c; part_of^op some nucellar projection^c

adaxial petiole canal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025239

has super-classes: petiole canal^c

adaxial protoderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006083

has super-classes: protoderm^c

adult vascular leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006340

Many species have juvenile leaves at the base of the stem, adult leaves at the apex, and transition leaves in between. In maize, juvenile leaves are at the tip of the stalk (stem), which differentiates first, with adult leaves at the base, while other grasses may have other arrangements. In some plants the juvenile leaves may go on to establish as adult leaves.

has super-classes: vascular leaf^c
has sub-classes: flag leaf^c, phyllode leaf^c

adventitious root nodule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000040

Unlike the root nodules, these contain functioning chloroplasts in the nodule cortex and are therefore capable of carbon fixation. Note: stem nodule is commonly used term for this structure, although the nodules are formed at positions of dormant adventitious root primordia.

has super-classes: root nodule^c; part_of^op some shoot-borne root^c

adventitious root primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008038

This term was made obsolete because the PO does not have a distinct term for adventitious root. It is replaced by basal root primordium (PO:0025479) and shoot-borne root primordium (PO:0025480).

adventitious shoot axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025534

has super-classes: b f o 0000004; shoot axis^c; develops_from^op some bud^c

aerenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005702

As applied to an intercellular space, originating by one or a combination of two processes, separation and degradation of cell walls.

has super-classes: parenchyma^c
has sub-classes: leaf aerenchyma^c, root aerenchyma^c, stem aerenchyma^c

aerial tuber^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004548

has super-classes: shoot axis tuber^c

aerial tuber axillary bud meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025069

has super-classes: shoot axis tuber axillary bud meristem^c; part_of^op some aerial tuber^c

aerial tuber axillary shoot^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025079

has super-classes: tuber axillary shoot^c; part_of^op some aerial tuber^c

aerial tuber axillary vegetative bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025041

has super-classes: shoot axis tuber axillary vegetative bud^c; part_of^op some aerial tuber^c

aerial tuber cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025056

is equivalent to: tuber cortex^c and (part_of^op some aerial tuber storage parenchyma^c)
has super-classes: tuber cortex^c; part_of^op some aerial tuber storage parenchyma^c

aerial tuber epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025047

has super-classes: shoot axis tuber epidermis^c; part_of^op some aerial tuber^c

aerial tuber interfascicular region^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025051

has super-classes: tuber interfascicular region^c; part_of^op some aerial tuber storage parenchyma^c

aerial tuber periderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025044

has super-classes: shoot axis tuber periderm^c

aerial tuber perimedullary zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025062

has super-classes: tuber perimedullary zone^c; part_of^op some aerial tuber pith^c

aerial tuber pith^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025054

has super-classes: tuber pith^c; part_of^op some aerial tuber storage parenchyma^c

aerial tuber storage parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025039

See part_of children for individual components of aerial tuber flesh.

has super-classes: tuber storage parenchyma^c; part_of^op some aerial tuber^c

alar cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030057

Found in mosses. Alar cells occur in an area at the base of a leaf that may be triangular, ovate or rectangular and is sometimes called the alar region. They are different in size, shape, color, thickness, or ornamentation from other cells in the leaf.

has super-classes: native plant cell^c; part_of^op some non-vascular leaf^c; part_of^op some leaf base^c

albuminous cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025412

May be found in the ray system (PO:0025411) and sometimes the axial system (PO:0025410) of gymnosperms. Compare to companion cells (PO:0000071), which are found in angiosperms.

has super-classes: b f o 0000004; parenchyma cell^c; part_of^op some phloem^c; adjacent_to^op some sieve cell^c

aleurone layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005360

Occurs in cereals and many other taxa. The protein bodies (GO:0042735) contain seed storage proteins and enzymes involved with endosperm digestion (Esau, 1977).

has super-classes: portion of plant tissue^c; part_of^op some endosperm^c
has sub-classes: modified aleurone^c

amphithecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030084

Term used for bryophytes. May have one or more layers. An amphithecium may give rise to an exothecium and other layers of a sporangium wall (jacket layer or layers). In true mosses, the amphithecium gives rise to the sporangium wall and the peristome. In hornworts and peat mosses, it gives rise to the sporangium wall and sporogenous tissue.

has super-classes: portion of plant tissue^c

androecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009061

The androecium also has as parts any staminodes (PO:0009077) that may be present in a flower. If annotating gene expression to an androecium with a single stamen (PO:0009029), the annotation should go on stamen. If you are annotating to this structure for Zea mays, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), lower floret of pedicellate spikelet of ear (PO:0006353), lower floret of sessile spikelet of ear (PO:0006351), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316). The development of an androecium in an ear floret of a normal maize plant is aborted and is present in a rudimentary state, while the development of an androecium in a tassel floret leads to a functional androecium.

has super-classes: b f o 0000004; collective phyllome structure^c; part_of^op some flower^c; develops_from^op some androecium primordium^c

androecium development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007605

has super-classes: collective phyllome structure development stage^c; part_of^op some floral organ differentiation stage^c
has sub-classes: anther development stage^c, stamen primordium visible stage^c

androecium primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025478

Use stamen primordium (PO:0004705) for the primordium (PO:0025127) of an individual stamen (PO:0009029).

has super-classes: floral organ primordium^c

angular collenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005621

The term was made obsolete because angular form is a common attribute of ordinary collenchyma.

anthela inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030125

Examples include species of Filipendula (Rosaceae).

has super-classes: inflorescence^c

anther^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009066

Generally consists of four pollen sacs (microsporangia) in two anther thecas. If you are annotating to anther or one of its parts for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: b f o 0000004; collective plant organ structure^c; develops_from^op some anther primordium^c; has_part^op some pollen sac^c; part_of^op some stamen^c

anther dehiscence zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005011

Extends along the entire length of the anther and is observed as an indentation between the locules of each theca. Upon anther maturation, cell separation within the dehiscence zone allows the anther wall to break open and pollen to be released.

has super-classes: dehiscence zone^c; part_of^op some anther^c

anther development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001004

has super-classes: androecium development stage^c
has sub-classes: A archesporial cells visible stage^c, B formation of primary parietal and sporogenous cells stage^c, C four anther lobes formed stage^c, D locules established stage^c, E anther wall tapetum degeneration initiated stage^c, F bilocular anther stage^c, G anther dehiscence stage^c, H anther senescence stage^c

anther locule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025264

has super-classes: sporangium locule^c; part_of^op some anther^c

anther pore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025118

Pollen may be released through the anther pore.

has super-classes: plant anatomical space^c; part_of^op some anther^c

anther primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006089

has super-classes: floral organ primordium^c

anther septum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005010

has super-classes: septum^c; part_of^op some anther dehiscence zone^c

anther theca^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009069

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: collective plant organ structure^c; has_part^op some pollen sac^c; part_of^op some anther^c

anther vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008013

has super-classes: phyllome vascular system^c; part_of^op some anther^c; part_of^op some stamen vascular system^c

anther wall^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000002

Has an outer epidermis (exothecium) and an endothecium and may have additional layers. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: microsporangium wall^c; part_of^op some anther^c

anther wall endothecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020002

May have secondary thickening of walls of cells that are involved in anther dehiscence. There can be more than one layer in an anther endothecium. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: microsporangium endothecium^c; adjacent_to^op some anther wall exothecium^c; part_of^op some anther wall^c

anther wall exothecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020004

Often with thickened cell walls. Involved in anther dehiscence. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: stamen epidermis^c; microsporangium exothecium^c; part_of^op some anther wall^c

anther wall inner secondary parietal cell layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006008

In many angiosperms, including Arabidopsis, it divides periclinally to form an anther wall middle layer externally and an anther wall tapetum internally. Alternatively, it may differentiate into a tapetum.

has super-classes: anther wall secondary parietal cell layer^c

anther wall middle layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004700

May be a single or double layer. Usually crushed by the endothecium and therefore almost invariably degenerates early during anther development. In some angiosperms, including Arabidopsis, it develops from an anther wall outer secondary parietal cell layer. In other angiosperms, it develops directly from an anther wall primary parietal cell layer, while in still others, two layers of the middle layer may develop from both an anther wall outer secondary parietal cell layer and an anther wall inner secondary parietal cell layer.

has super-classes: portion of ground tissue^c; develops_from^op some anther wall secondary parietal cell layer^c; adjacent_to^op some anther wall endothecium^c; part_of^op some anther wall^c

anther wall outer secondary parietal cell layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006009

In many angiosperms, including Arabidopsis, it differentiates into the anther wall endothecium. Alternatively, it may divide periclinally to form an anther wall endothecium externally and an anther wall middle layer internally.

has super-classes: anther wall secondary parietal cell layer^c

anther wall primary parietal cell layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006006

has super-classes: portion of ground tissue^c; part_of^op some anther wall^c

anther wall secondary parietal cell layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006007

In many angiosperms, the cells of the anther wall primary parietal cell layer undergo a periclinal division, resulting in the formation of two anther wall secondary parietal layers.

has super-classes: portion of ground tissue^c; part_of^op some anther wall^c; develops_from^op some anther wall primary parietal cell layer^c
has sub-classes: anther wall inner secondary parietal cell layer^c, anther wall outer secondary parietal cell layer^c

anther wall tapetum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009071

Develops from a primary or secondary parietal cell layer. Innermost part of the anther wall, involved in the nutrition of the pollen. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: microsporangium tapetum^c; part_of^op some anther wall^c

anther wall tapetum cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025545

has super-classes: microsporangium tapetum cell^c; part_of^op some anther wall tapetum^c

antheridiophore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030033

Found in mosses and other bryophytes such as the liverwort Marchantiales.

has super-classes: b f o 0000002; stalk^c; has_part^op some antheridium head^c; participates_in^op some gametophyte development stage^c

antheridium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025125

The antheridium (PO:0025125) occurs in bryophytes and pteridophytes, but never in gymnosperms or angiosperms, where male gametes are produced in the pollen (PO:0025281), a specialized (reduced) gametangium.

has super-classes: multicellular plant gametangium^c

antheridium head^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030075

Found in mosses and other bryophytes such as the liverwort Marchantiales.

has super-classes: cardinal organ part^c; has_part^op some antheridium^c

antheridium jacket layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030053

Cells in the antheridium jacket layer surround the spermatogenous cells (PO:0025525) and do not give rise to antheridium sperm cells (PO:0025120).

has super-classes: portion of plant tissue^c; part_of^op some antheridium^c

antheridium jacket layer cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030052

has super-classes: native plant cell^c; part_of^op some antheridium jacket layer^c

antheridium microgametophyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025283

Microgametophytes in bryophytes only produce sperm cells, but do not develop from microspores, because there is no heterospory in bryophytes. In some pteridophytes, microgametophytes develop from microspores.

has super-classes: microgametophyte^c; has_part^op some antheridium^c

antheridium sperm cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025120

Antheridial sperm cells are motile and lack a cell wall.

has super-classes: plant sperm cell^c; located_in^op some antheridium^c

antheridium stalk^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030035

The antheridium stalk raises the antheridium (PO:0025125) from the antheridium head (PO:0030075).

has super-classes: stalk^c; part_of^op some antheridium^c

antipodal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020093

More or less persistent, multiplicative or not.

has super-classes: embryo sac cell^c

antiraphe^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020028

has super-classes: cardinal organ part^c; part_of^op some plant ovule^c

apical hook^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000012

has super-classes: b f o 0000004; cardinal organ part^c; part_of^op some primary shoot system^c; develops_from^op some hypocotyl^c

apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020144

has super-classes: portion of meristem tissue^c; has_part^op some protoderm^c
has sub-classes: root apical meristem^c, shoot apical meristem^c

archegoniophore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030034

Found in Marchantiales.

has super-classes: c a r o 0000000; stalk^c; has_part^op some archegonium head^c; participates_in^op some gametophyte development stage^c

archegonium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025126

At maturity, the archegonium produces an archegonium egg cell (PO:0025122). In mosses, the archegonium also has part an archegonium stalk (PO:0030036). The archegonium (PO:0025126) occurs in bryophytes and pteridophytes, but never in angiosperms, where the female gamete (plant egg cell; PO:0020094) is produced by the embryo sac (PO:0025074), a specialized (reduced) gametangium.

has super-classes: b f o 0000004; multicellular plant gametangium^c; develops_from^op some archegonium initial cell^c

archegonium central cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025509

The archegonium central cell divides asymmetrically to form a smaller ventral canal cell (PO:0025524) and a larger archegonium egg cell (PO:0025122). It is larger than the archegonium neck canal cell (PO:0030065), which also develops from the archegonium initial cell (PO:0025510). The archegonium central cell only occurs in gymnosperms.

has super-classes: b f o 0000004; native plant cell^c; develops_from^op some archegonium initial cell^c

archegonium egg cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025122

The archegonium egg cell has a common origin with the ventral canal cell.

has super-classes: b f o 0000040; plant egg cell^c; located_in^op some venter^c; develops_from^op some archegonium central cell^c

archegonium head^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030076

Found in Marchantiales.

has super-classes: c a r o 0000000; cardinal organ part^c; has_part^op some archegonium^c

archegonium initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025510

has super-classes: initial cell^c

archegonium megagametophyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025282

has super-classes: c a r o 0000000; megagametophyte^c; has_part^op some archegonium^c

archegonium neck^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030039

Early in development, the archegonium neck is occluded by a single row of neck canal cells (PO:0030065). At maturity, the neck canal cells (PO:0030065) and the ventral canal cell (PO:0025524) disintegrate, creating a archegonium neck canal (PO:0030066) for the plant sperm cells (PO:0000084) to enter the archegonium (PO:0025126).

has super-classes: cardinal organ part^c; part_of^op some archegonium^c

archegonium neck canal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030066

During archegonium development, the archegonium neck canal cells (PO:0030065) and the ventral canal cell (PO:0025524) disintegrate, creating a archegonium neck canal for the plant sperm cells (PO:0000084) to enter the archegonium (PO:0025126).

has super-classes: canal^c; part_of^op some archegonium neck^c

archegonium neck canal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030065

has super-classes: b f o 0000004; native plant cell^c; develops_from^op some archegonium initial cell^c; part_of^op some archegonium neck^c

archegonium stalk^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030036

Raises the venter above the rest of the gametophyte.

has super-classes: stalk^c; part_of^op some archegonium^c

archesporial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030056

May also give rise to sterile cells such as elators (in liverworts) or tapetal cells. In most species outside seed plants, multiple archesporial cells are part of an archesporium or sporogenous tissue.

has super-classes: native plant cell^c; part_of^op some sporangium^c
has sub-classes: female archesporial cell^c, male archesporial cell^c

archesporium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030074

Gives rise to sporocytes and may give rise to other sterile cells such as elators.

has super-classes: portion of plant tissue^c; has_part^op some archesporial cell^c; part_of^op some sporangium^c

areole bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025353

Found in Cactaceae. Appears as a cluster of spine leaves (PO:0025173). May be covered in trichomes (PO:0000282). In species with tubercles (PO:0025352), the areole bud is often found at the distal end of the tubercle. The areole bud originates in a leaf axil (PO:0009023) of a leaf that becomes a tubercle but is displaced to the tip of a tubercle through elongation of the tubercle.

has super-classes: axillary vegetative bud^c

aril^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009090

Usually envelopes most of the seed and is fleshy. If the ovule is pressed against the funicle to form a raphe, it may appear that the aril is growing from the raphe.

has super-classes: b f o 0000004; arilloid^c; develops_from^op some funicle^c

arillode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025378

Generally larger than a caruncle and not hard.

has super-classes: arilloid^c

arilloid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0019022

Often conspicuous and found on seeds with a hard testa that are dispersed by animals. There is some variation in how different sources define the subtypes of arilloids.

has super-classes: cardinal part of multi-tissue plant structure^c; part_of^op some seed^c
has sub-classes: aril^c, arillode^c, caruncle^c, strophiole^c

articulated laticifer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005006

The articulated laticifer cells are joined longitudinally to form a tube, with cross-walls that may be partially to fully perforated.

has super-classes: portion of secretory tissue^c

articulated laticifer cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006221

The walls between contiguous cells may be perforated or may disappear completely. This terms should be used for individual cells. For multiple cells joined together, use articulated laticifer (PO:0005006).

has super-classes: laticifer cell^c; part_of^op some articulated laticifer^c

awn^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025349

Found in a spikelet of Poaceae. Sometimes the awn is a continuation of the bearing structure's central primary vein.

has super-classes: cardinal organ part^c; part_of^op some spikelet^c
has sub-classes: glume awn^c, lemma awn^c, palea awn^c

axial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000081

This term was made obsolete because it is not appropriate. It is replaced by sieve element, tracheary element, and fiber cell.

axial secondary xylem parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004533

is equivalent to: secondary xylem parenchyma^c and (part_of^op some axial system^c)
has super-classes: secondary xylem parenchyma^c; part_of^op some axial system^c

axial secondary xylem parenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004526

is equivalent to: secondary xylem parenchyma cell^c and (part_of^op some axial secondary xylem parenchyma^c)
has super-classes: b f o 0000004; secondary xylem parenchyma cell^c; part_of^op some axial secondary xylem parenchyma^c; develops_from^op some fusiform initial cell^c

axial system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025410

Includes portions of secondary xylem (PO:0005848) and axial wood parenchyma (PO:0004533).

has super-classes: secondary vascular tissue^c

axil^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025224

has super-classes: plant anatomical space^c
has sub-classes: bract axil^c, branch axil^c, leaf axil^c

axillary bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004709

has super-classes: bud^c
has sub-classes: axillary reproductive bud^c, axillary vegetative bud^c

axillary bud meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000232

has super-classes: shoot system meristem^c
has sub-classes: shoot axis tuber axillary bud meristem^c

axillary flower bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004710

has super-classes: flower bud^c; axillary reproductive bud^c

axillary hair^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025316

Found in monocots and mosses. The basal stalk may contain one or more cells.

has super-classes: multicellular trichome^c
has sub-classes: gametophore axillary hair^c

axillary hair basal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025319

has super-classes: trichome cell^c; part_of^op some axillary hair base^c
has sub-classes: gametophore axillary hair basal cell^c

axillary hair base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025318

Consists of two or more plant cells.

has super-classes: portion of plant tissue^c; part_of^op some axillary hair^c
has sub-classes: gametophore axillary hair base^c

axillary hair terminal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025317

has super-classes: trichome cell^c; part_of^op some axillary hair^c
has sub-classes: gametophore axillary hair terminal cell^c

axillary inflorescence bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004711

has super-classes: inflorescence bud^c; axillary reproductive bud^c

axillary reproductive bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025072

has super-classes: axillary bud^c; reproductive bud^c
has sub-classes: axillary flower bud^c, axillary inflorescence bud^c, axillary strobilus bud^c

axillary shoot system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006343

has super-classes: b f o 0000004; shoot-borne shoot system^c; develops_from^op some axillary bud^c
has sub-classes: basal axillary shoot system^c, cauline axillary shoot^c, long shoot^c, short shoot^c, tuber axillary shoot^c

axillary strobilus bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025076

has super-classes: axillary reproductive bud^c; strobilus bud^c

axillary vegetative bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004712

has super-classes: vegetative bud^c; axillary bud^c
has sub-classes: areole bud^c, shoot axis tuber axillary vegetative bud^c

B enlarged microsporocyte stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001006

has super-classes: pollen development stage^c

B formation of primary parietal and sporogenous cells stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001018

has super-classes: anther development stage^c

B meiosis of megaspore mother cell stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007624

has super-classes: megagametophyte development stage^c

B1 primary root meristem formation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007524

B2 lateral root meristem formation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007539

B3 crown root meristem formation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007514

banner petal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025324

Usually larger than the adjacent wing petals. Found in the flowers of some Fabaceae.

has super-classes: petal^c

bark^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004518

has super-classes: b f o 0000004; portion of plant tissue^c; develops_from^op some secondary phloem^c

basal axillary shoot system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005001

Called a tiller in the Poaceae.

has super-classes: axillary shoot system^c

basal endosperm transfer cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009018

Responsible for transferring nutrients to an embryo by symplastic or apoplastic methods.

has super-classes: transfer cell^c; part_of^op some basal endosperm transfer layer^c

basal endosperm transfer layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025196

Involved in transferring nutrients to a plant embryo (PO:0009009).

has super-classes: portion of plant tissue^c; part_of^op some endosperm^c

basal root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025002

has super-classes: shoot-borne internode root^c; develops_from^op some basal root primordium^c

basal root primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025479

Transition from basal root primordium to basal root occurs with the formation of a root cap (PO:0020123), shortly after the development of a root apical meristem (PO:0020147).

has super-classes: root primordium^c

beginning of whole plant fruit ripening stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007036

has super-classes: whole plant fruit ripening stage^c

berry fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030108

Examples: pepper (Capsicum annuum), papaya (Carica papaya), avocado (Persea americana), may apple (Podophyllum peltatum), date palm (Phoenix dactylifera), tomato (Solanum lycopersicum), potato (Solanum tuberosum), chocolate (Theobroma cacao), blueberry (Vaccinium spp.), and grape (Vitis vinifera).

has super-classes: fruit^c
has sub-classes: hesperidium fruit^c, pepo fruit^c, pome fruit^c

BO.00 booting begins stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007051

Booting is a term used specifically for grasses (Poaceae).

has super-classes: booting stage^c

BO.01 early boot stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007018

In rice the flag leaf sheath is 5cm out of the penultimate leaf sheath. Upper part of the stem is slightly thickened. Booting is a term used specifically for grasses (Poaceae).

has super-classes: booting stage^c

BO.02 mid boot stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007044

In rice the flag leaf sheath is 5-10cm out of the penultimate leaf sheath. Booting is a term used specifically for grasses (Poaceae).

has super-classes: booting stage^c

BO.03 late boot stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007013

In rice the flag leaf sheath is more than 10cm out of the penultimate leaf sheath. Booting is a term used specifically for grasses (Poaceae).

has super-classes: booting stage^c

BO.04 flag leaf sheath opening stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007028

Booting is a term used specifically for grasses (Poaceae).

has super-classes: booting stage^c

BO.05 flag leaf sheath opened stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007019

Awns will be visible only in those species and varieties where they are known to be present. Booting is a term used specifically for grasses (Poaceae).

has super-classes: booting stage^c

body cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025526

Occurs in gymnosperms.

has super-classes: spermatogenous cell^c

booting stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007014

Booting is a term used specifically for grasses (Poaceae).

has super-classes: IL.00 inflorescence just visible stage^c
has sub-classes: BO.00 booting begins stage^c, BO.01 early boot stage^c, BO.02 mid boot stage^c, BO.03 late boot stage^c, BO.04 flag leaf sheath opening stage^c, BO.05 flag leaf sheath opened stage^c

bostryx inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030134

Examples include some species of the Forget-me-not family (Boraginaceae).

has super-classes: inflorescence^c

brachycyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030058

Found in mosses. A brachycyte is a drought tolerant cell that can act as a gemma (PO:0025614) and may give rise to a new plant. Cells of a protonema (PO:0030003) may develop into brachycytes under stress. May form a chain or be separated by tmema cells (PO:0030059).

has super-classes: b f o 0000002; native plant cell^c; participates_in^op some gametophyte development stage^c

bract^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009055

Usually different from leaves. Often used to refer to a floral bract, but includes other kinds of bracts.

has super-classes: phyllome^c; develops_from^op some bract primordium^c
has sub-classes: flower bract^c, inflorescence bract^c, perichaetal bract^c, perigonial bract^c

bract abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025159

has super-classes: bract epidermis^c

bract adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025160

has super-classes: bract epidermis^c

bract anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025482

has super-classes: phyllome anlagen^c

bract apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025154

It is not precisely defined how far toward the base from the tip a bract apex extends. For the apical most portion of a bract, use the term bract tip.

has super-classes: phyllome apex^c; part_of^op some bract^c

bract axil^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025225

has super-classes: axil^c

bract base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025155

has super-classes: phyllome base^c; part_of^op some bract^c

bract epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025158

is equivalent to: phyllome epidermis^c and (part_of^op some bract^c)
has super-classes: phyllome epidermis^c; part_of^op some bract^c
has sub-classes: bract abaxial epidermis^c, bract adaxial epidermis^c, bract stomatal complex^c

bract margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025011

has super-classes: phyllome margin^c; part_of^op some bract^c

bract primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025487

has super-classes: phyllome primordium^c; part_of^op some reproductive shoot apex^c; develops_from^op some bract anlagen^c
has sub-classes: flower bract primordium^c, inflorescence bract primordium^c

bract stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025216

has super-classes: bract epidermis^c; phyllome stomatal complex^c

bract tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025156

This term is to be used for only the apical most portion of a bract. For a larger area, use the term bract apex. Use this term when describing the shape of a bract tip.

has super-classes: phyllome tip^c

bract trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025098

has super-classes: phyllome trichome^c; part_of^op some bract epidermis^c

bracteole^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009043

has super-classes: prophyll^c; part_of^op some pedicel^c

branch^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025073

In vascular plants, branches arise from an axillary bud meristem (PO:0000232) and from divisions of the meristematic apical cell (PO:0030007) in non-vascular plants.

has super-classes: shoot axis^c
has sub-classes: branch tendril^c, gametophore branch^c, stolon^c, thorn^c

branch apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0028004

has super-classes: shoot axis apex^c; part_of^op some branch^c

branch axil^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025226

has super-classes: axil^c

branch epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025179

is equivalent to: shoot axis epidermis^c and (part_of^op some branch^c)
has super-classes: shoot axis epidermis^c; part_of^op some branch^c
has sub-classes: peduncle epidermis^c

branch internode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025080

has super-classes: shoot axis internode^c; part_of^op some branch^c

branch internode differentiation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025103

has super-classes: shoot internode differentiation zone^c; part_of^op some branch internode^c

branch internode elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025101

has super-classes: shoot axis internode elongation zone^c; part_of^op some branch internode^c

branch node^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025024

has super-classes: shoot axis node^c; part_of^op some branch^c

branch procambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025274

has super-classes: shoot axis procambium^c

branch stele^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025199

has super-classes: shoot axis stele^c; part_of^op some branch^c

branch tendril^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025364

Aids plant in climbing. A branch tendril will usually be subtended by a leaf or leaf scar. May be branched, may have adhesive disks at its distal end, may be woody, and may bear small leaves. See also leaf tendril (PO:0025361), leaflet tendril (PO:0025362), leaf apex tendril (PO:0025363), stem apex tendril (PO:0025365), leaf rachis tendril (PO:0025366), and prophyll tendril (PO:0025367). Careful observation is required to correctly classify some tendrils.

has super-classes: branch^c

branch trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025177

has super-classes: shoot axis trichome^c; part_of^op some branch epidermis^c

bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000055

has super-classes: b f o 0000002; shoot system^c; participates_in^op some bud development stage^c
has sub-classes: axillary bud^c, reproductive bud^c, terminal bud^c, vegetative bud^c

bud burst stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025532

has super-classes: shoot system development stage^c

bud development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025528

has super-classes: shoot system development stage^c
has sub-classes: bud dormancy stage^c, bud swell stage^c

bud dormancy stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025529

has super-classes: bud development stage^c

bud scale leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020054

has super-classes: scale leaf^c

bud swell stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025531

has super-classes: bud development stage^c

bulb^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025356

May serve as a storage and/or perennating organ. Usually underground. A bulb differs from a corm (PO:0025355) by having fleshy leaves or leaf bases. The outer leaves of a bulb are often dry and membranous, rather than fleshy. May bear adventitious roots. Examples include Alium and Tulipa. Not the same structure as a bulbil.

has super-classes: shoot system^c

bulliform cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004001

Also called motor cell because of its presumed participation in the mechanism of rolling and unrolling of leaves. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: leaf pavement cell^c; part_of^op some vascular leaf^c

bundle sheath^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006023

has super-classes: portion of ground tissue^c; part_of^op some vascular leaf^c
has sub-classes: mestome sheath^c, parenchyma sheath^c

bundle sheath cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025541

has super-classes: ground tissue cell^c; part_of^op some bundle sheath^c
has sub-classes: bundle sheath chlorenchyma cell^c

bundle sheath chlorenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025542

has super-classes: chlorenchyma cell^c; bundle sheath cell^c

bundle sheath extension^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006022

has super-classes: portion of ground tissue^c

C callose wall formation in pollen mother cells stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001008

has super-classes: pollen development stage^c

C four anther lobes formed stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001025

has super-classes: anther development stage^c

C tetrad of megaspores stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007625

has super-classes: megagametophyte development stage^c

C3.1 metaxylem differentiation of root.^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007521

These stages are based on Arabidopsis plant. This term has been obsoleted to keep the structure simple.

C3.2 maturation of phloem elements in root.^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007537

This term has been obsoleted to keep the structure simple.

C3.3 maturation of protoxylem elements in root.^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007533

This term has been obsoleted to keep the structure simple.

callus parenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025285

has super-classes: parenchyma cell^c; part_of^op some plant callus^c

calyptra calyx^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025329

Sometimes found in Eucalyptus and other Myrtaceae, covering an inner operculum or calyptra corolla. The sepals are generally completely fused. Species of the subgenus Monocalyptrus have only a calyptra corolla (inner operculum) while in most other species, a calyptra calyx is also present, at least early in flower development. Not the same structure as a spore capsule calyptra or fruit operculum. Sometimes erroneously referred to as part of a fruit.

has super-classes: fused calyx^c

calyptra corolla^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025330

Often found in Eucalyptus and other Myrtaceae. The petals are generally completely fused. If an outer operculum (calyptra calyx) is present, it covers the inner operculum (calyptra corolla). Species of the subgenus Monocalyptrus have only a calyptra corolla (inner operculum) while in most other species, a calyptra calyx is also present, at least early in flower development. Not the same structure as a spore capsule calyptra or fruit operculum. Sometimes erroneously referred to as part of a fruit.

has super-classes: fused corolla^c

calyptra perianth^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025299

Found in Eucalyptus and other Myrtaceae. This term was made obsolete and replaced by the more specific terms calyptra calyx (PO:0025329) and calyptra corolla (PO:0025330).

calyx^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009060

The calyx is part of the perianth (PO:0009058). This definition is based on the perfect flower, which has all four whorls. In many species, and in mutants one or more of the whorls are missing.

has super-classes: collective phyllome structure^c; part_of^op some perianth^c
has sub-classes: fused calyx^c

calyx absolute size^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0021002

calyx development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007603

has super-classes: collective phyllome structure development stage^c; part_of^op some floral organ differentiation stage^c
has sub-classes: fully expanded sepal stage^c, sepal differentiation and expansion stage^c, sepal primordium visible stage^c

calyx relationship^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0021003

cambial initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000295

has super-classes: initial cell^c; part_of^op some cambium^c
has sub-classes: fusiform initial cell^c, phloem mother cell^c, ray initial cell^c
is disjoint with: root initial cell^c, epidermal initial cell^c, protonema side branch initial cell^c, protonema sub-apical initial cell^c

cambial zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025439

The cambial zone generally consists of the initial cells of the cambium and their immediate derivatives, arranged in radial files. This term is used for the cambium (PO:0005597) and surrounding area, especially when the borders of the cambium are not clear.

has super-classes: cardinal organ part^c; has_part^op some cambium^c; part_of^op some plant axis^c
has sub-classes: root cambial zone^c, shoot axis cambial zone^c

cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005597

This term is applied to only two types of meristems: vascular cambium (PO:0005598) and cork cambium/phellogen (PO:0005599).

has super-classes: lateral meristem^c
has sub-classes: cork cambium^c, vascular cambium^c

cambium-like transitional zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006067

If found, this zone is a temporary feature mostly in Gymnosperms.

canal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025132

May be cylindrical (PATO:0001203) in shape, with a circular, D-shaped or other irregularly-shaped cross-section.

has super-classes: plant anatomical space^c
has sub-classes: archegonium neck canal^c, hilum groove^c, petiole canal^c, resin canal^c

capitulum inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030121

Many capitulum inflorescences have basal involucral bracts (PO:0009045) and are often discoid or globose in shape. Examples include sunflowers (Helianthus spp.; Asteraceae) and teasels (Dipsacus spp.; Dipsacaceae).

has super-classes: inflorescence^c

capsule fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030091

Capsule fruits (PO:0030091) are divided into subcategories depending upon the location of sutures in the pericarp (PO:0009084) that the seeds (PO:0009010) are released through.

has super-classes: fruit^c
has sub-classes: circumscissile capsule fruit^c, coccarium capsule fruit^c, loculicidal capsule fruit^c, poricidal capsule fruit^c, septicidal capsule fruit^c

cardinal organ part^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025001

Cardinal refers to the fact that these are biologically meaningful and not arbitrary parts. Examples include petiole (PO:0020038), lamina (PO:0025060), and leaflet (PO:0020049). See also collective organ part structure (PO:0025269), for plant structures composed of parts of multiple organs.

is equivalent to: cardinal part of multi-tissue plant structure^c and (part_of^op some plant organ^c)
has super-classes: cardinal part of multi-tissue plant structure^c; part_of^op some plant organ^c
has sub-classes: antheridium head^c, antiraphe^c, apical hook^c, archegonium head^c, archegonium neck^c, awn^c, cambial zone^c, central zone of the leaf lamina^c, central zone of the petiole^c, connective^c, egg apparatus^c, elaiosome^c, hydathode^c, hypanthium^c, hyperphyll^c, hypocotyl-root junction^c, leaf lamina base^c, leaf sheath^c, leaf sheath auricle^c, leaf sheath margin^c, leaflet^c, leaflet margin^c, lemma apiculus^c, ligule^c, palea apiculus^c, pappus element^c, peristome^c, peristome tooth^c, petal spur^c, petiole distal end^c, petiole margin^c, petiole proximal end^c, phyllome apex^c, phyllome base^c, phyllome lamina areole^c, phyllome lamina crena^c, phyllome lamina lobe^c, phyllome lamina tooth^c, phyllome tip^c, plant axis differentiation zone^c, plant axis elongation zone^c, plant organ lamina^c, plant organ margin^c, pulvinus^c, raphe^c, receptacle^c, root nodule^c, root tip^c, shoot axis internode^c, shoot axis node^c, sporangium base^c, sporangium theca^c, sporangium wall^c, spore capsule calyptra^c, spore capsule operculum^c, stalk^c, stele^c, stem base^c, stigma^c, stipel^c, stipule^c, style^c, transition zone^c, valve^c, venter^c
is disjoint with: vascular system^c, plant cell^c, portion of plant tissue^c

cardinal part of multi-tissue plant structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025498

Includes cardinal parts of plant organs (PO:0025001) as well as parts of other multi-tissue plant structures. Cardinal refers to the fact that these are biologically meaningful and not arbitrary parts. Most cardinal parts of multi-tissue plant structures have both fiat and bona-fide boundaries, including parts with large fiat boundaries, such as leaf base (PO:0020040) or fruit distal end (PO:0008001), and parts with primarily bona-fide boundaries, such as leaflet (PO:0020049).

has super-classes: plant structure^c; part_of^op some multi-tissue plant structure^c
has sub-classes: arilloid^c, cardinal organ part^c, fruit distal end^c, fruit proximal end^c, hilum^c, lamina^c, mericarp^c, seed funicle^c, seed raphe^c, silk scar^c

carpel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009030

In some cases, a gynoecium (PO:0009062) may consist of only one carpel, in which case annotations should go on carpel (PO:0009030). The word pistil is used synonymously with gynoecium, but if a gynoecium consists of a single carpel, then pistil may be used synonymously with carpel. If carpels are fused, the gynoecium is a syncarpous gynoecium, as in Poaceae, Brassicaceae and Solanaceae. If carpels are free, the gynoecium is an apocarpous gynoecium, as in Fabaceae. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352), tassel floret (PO:0006310), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: megasporophyll^c; floral organ^c; part_of^op some gynoecium^c; develops_from^op some carpel primordium^c

carpel abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025617

The abaxial surface is the one which is furthest from the plant axis.

has super-classes: carpel epidermis^c

carpel adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025618

The adaxial surface is the one which is closest to the plant axis.

has super-classes: carpel epidermis^c

carpel anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006005

has super-classes: phyllome anlagen^c; part_of^op some flower meristem^c

carpel epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025096

is equivalent to: phyllome epidermis^c and (part_of^op some carpel^c)
has super-classes: phyllome epidermis^c; part_of^op some carpel^c
has sub-classes: carpel abaxial epidermis^c, carpel adaxial epidermis^c, carpel stomatal complex^c, plant ovary epidermis^c, stigma epidermis^c, style epidermis^c

carpel margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025019

Only flattened carpels can have a margin.

has super-classes: sporophyll margin^c; part_of^op some carpel^c

carpel primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004703

has super-classes: phyllome primordium^c; floral organ primordium^c; develops_from^op some carpel anlagen^c

carpel primordium visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007618

has super-classes: gynoecium development stage^c

carpel septum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005009

Carpel septum was made obsolete because it was ambiguous. It has been replaced by the more precise terms ovary septum (PO:0025262) and ovary replum (PO:0025272). Annotations for Arabidopsis should go to ovary replum (PO:0025272).

carpel stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025217

has super-classes: carpel epidermis^c; phyllome stomatal complex^c

carpel trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025208

has super-classes: phyllome trichome^c; part_of^op some carpel epidermis^c

carpel vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005019

has super-classes: phyllome vascular system^c; part_of^op some carpel^c

caruncle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020060

Often hard and generally smaller and less elaborate than a arillode.

has super-classes: arilloid^c

caryopsis fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030104

Caryopsis fruit (PO:0030104) is characteristic of the Poaceae (the grass family). Caryopsis fruits develop from a pseudomonomerous gyneocium (PO:0009062), and contain only a single seed due to the abortion of two of the three carpels (PO:0009030). The pericarp of caryopsis fruits of some bamboo species is somewhat fleshy at maturity and is fused to the seed coat; these fruits are referred to in the literature as bacoid caryopses. Examples: barley (Hordeum vulgare), rice (Oryza spp.), wheat (Triticum spp.), corn (Zea mays), sorghum (Sorghum bicolor), oat (Avena spp.), zebra grass (Miscanthus spp.), Tausch’s goatgrass (Aegilops tauschii), stiff brome (Brachypodium distachyon), cutgrass (Leersia perrieri), and foxtail millet (Setaria italica).

has super-classes: fruit^c

caryopsis hull^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006000

has super-classes: b f o 0000004; collective phyllome structure^c; develops_from^op some palea^c; develops_from^op some lemma^c; part_of^op some infructescence^c

casparian strip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000023

Comment: this term is now available in the cellular_component aspect of the Gene Ontology (GO:0048226).

catkin inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030119

Examples include poplars (including Populus trichocarpa, Salicaceae) and birches (Betula spp., Betulaceae). Catkin inflorescences are often pendulate.

has super-classes: inflorescence^c

cauline axillary shoot^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005002

The genetic distinction between cauline axillary branches and tillers may or may not be unique to the Poaceae. There are no data for other plant families.

has super-classes: axillary shoot system^c

cauline leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000013

In Arabidopsis, refers to the leaves that are borne on the elongated inflorescence branches. May ocur singly or pairs/whorls of leaves.

has super-classes: vascular leaf^c

cauline paraclade^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025547

has super-classes: second order inflorescence axis^c

caulonema^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030005

Generally, the development of caulonema follows the development of chloronema. Only the caulonema, and not the chloronema, initiates gametophore buds.

has super-classes: protonema^c

caulonema cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030002

A caulonema cell contains fewer, less well-developed chloroplasts than a chloronema cell.

has super-classes: chlorenchyma cell^c; part_of^op some caulonema^c

caulonema meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030081

has super-classes: protonema meristematic apical cell^c

cell death stage of secondary xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025466

During this stage, the cells of a portion of secondary xylem are undergoing cell death (GO:0008219), sometimes called apoptosis. Death of the tracheary elements and non-septate xylem fiber cells generally precedes the death of secondary parenchyma cells and septate fiber cells. Once all cells in portion of secondary xylem are dead, it transitions from sapwood (PO:0004513) to heartwood (PO:0004512), and secondary xylem development ends.

has super-classes: cell differentiation stage of secondary xylem^c
has sub-classes: secondary xylem parenchyma cell death stage of secondary xylem^c, tracheary element death stage of secondary xylem^c

cell differentiation stage of secondary xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025469

During a this stage, cells of secondary xylem undergo cell differentiation (GO:0030154), including cell growth (GO:0016049), cell morphogenisis (GO:0000902), or cell death (GO:0008219). Cell death is considered part of differentiation in secondary xylem, because it is an essential part of wood development. This stage succeeds the last cell division in a cell division stage of secondary xylem, even though cell differentiation may begin before all cell division finishes.

has super-classes: secondary xylem development stage^c
has sub-classes: cell death stage of secondary xylem^c, cell expansion stage of secondary xylem^c, secondary cell wall formation stage of secondary xylem^c

cell division stage of secondary xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025463

This stage includes production of xylem mother cells by cambial initials and production of tracheary elements (PO:0000290) or other xylem cells by xylem mother cells. Precedes a cell differentiation stage of secondary xylem (PO:0025469), although cell differentiation may begin before a cell division stage of secondary xylem ends.

has super-classes: secondary xylem development stage^c

cell expansion stage of secondary xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025464

This stage succeeds a cell division stage of secondary xylem (PO:0025463) and precedes secondary cell wall formation stage of secondary xylem (PO:0025465). At least part of this stage can be easily observed in woody species containing xylem vessels (PO:0025417).

has super-classes: cell differentiation stage of secondary xylem^c

cellular endosperm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000199

has super-classes: endosperm^c

centarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025552

This pattern was common in early land plants.

has super-classes: protoxylem^c

central endosperm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006220

Also called starchy endosperm region (characteristic of some grasses).

has super-classes: portion of plant tissue^c; part_of^op some endosperm^c

central root cap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020130

has super-classes: root parenchyma^c; part_of^op some root cap^c
has sub-classes: central root cap of lateral root^c, central root cap of primary root^c

central root cap of lateral root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003019

has super-classes: central root cap^c; part_of^op some root cap of lateral root^c

central root cap of primary root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003021

has super-classes: central root cap^c; part_of^op some root cap of primary root^c

central strand^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030051

Often contains both hydrome and leptome. Found in bryophytes. The term central strand is sometimes used to describe a protostele in vascular plants, but this ontology class should only be used for non-vascular plants. Analogous to a vein or vascular bundle in vascular plants.

has super-classes: portion of plant tissue^c

central zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000224

Functions as a population of stem cells that replenishes the meristem.

has super-classes: portion of meristem tissue^c; part_of^op some shoot apical meristem^c

central zone of the leaf lamina^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008020

If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: cardinal organ part^c; part_of^op some leaf lamina^c

central zone of the petiole^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008025

has super-classes: cardinal organ part^c; part_of^op some petiole^c

ceonosorus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025360

has super-classes: collective plant organ structure^c; has_part^op some sorus^c; part_of^op some vascular leaf^c

chalaza^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020026

The chalaza is recognized as the region which initiates the two integuments at its flank. If you are annotating to this structure for an angiosperm, please add an additional annotation to plant ovary ovule (PO:0025490). If you are annotating to this structure for an gymnosperm, please add an additional annotation to ovuliferous scale ovule (PO:0025491). If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: portion of plant tissue^c; part_of^op some plant ovule^c

chalazal and micropylar domain establishment stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001041

has super-classes: endosperm development stage^c

chalazal cyst^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000201

Not in current literature. More like an attribute.

has super-classes: portion of plant tissue^c; part_of^op some endosperm^c

chlorenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005426

has super-classes: parenchyma^c
has sub-classes: mesophyll^c, plant ovary wall middle layer^c, protonema^c

chlorenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000076

has super-classes: parenchyma cell^c; part_of^op some chlorenchyma^c
has sub-classes: bundle sheath chlorenchyma cell^c, caulonema cell^c, chloronema cell^c, mesophyll cell^c

chloronema^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030004

Generally, the development of chloronema precedes the development of caulonema. Only the caulonema, and not the chloronema, initiates gametophore buds.

has super-classes: protonema^c

chloronema cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030001

A chloronema cell contains many well-developed chloroplasts.

has super-classes: chlorenchyma cell^c; part_of^op some chloronema^c

chloronema meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030082

has super-classes: protonema meristematic apical cell^c

cigar leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025130

Describes the phenotype of a vascular leaf during a leaf development phase in Musa and other monocots.

has super-classes: vascular leaf^c

cigar leaf lamina abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025135

has super-classes: leaf lamina abaxial epidermis^c; part_of^op some cigar leaf^c

cincinnus inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030132

Examples include species of the Dayflower family (Commelinaceae).

has super-classes: inflorescence^c

circumscissile capsule fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030096

Example: rose gum (Eucalyptus grandis).

has super-classes: capsule fruit^c
has sub-classes: utricle capsule fruit^c

cladode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025354

Has an increased surface area for photosynthesis and may function similar to leaves in plants that have no or small leaves, such as cacti. Consists of one to several internodes and nodes. Cladodes bear scale leaves (or leaf scars where temporary leaves have fallen off) that subtend axillary buds.

has super-classes: shoot axis^c

closure of carpel(s) stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004502

Closure of the carpel can occur in various ways, by fusion or secretion.

has super-classes: gynoecium development stage^c

coccarium capsule fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030094

When annotating to a capsule fruit (PO:0030091) which only dehisces through the fruit septa (PO:0025268), annotate to septicidal capsule fruit (PO:0030093). When annotating to a capsule fruit which only dehisces through the fruit locules (PO:0025270), annotate to loculicidal capsule fruit (PO:0030092). Examples: physic nut (Jatropha curcas) and Manihot brachyloba.

has super-classes: capsule fruit^c

coleoptile^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020033

The coleoptile is an outgrowth or part of the scutellum (PO:0020110) (which is a modified, haustorial cotyledon (PO:0020030)). Develops separate from the shoot apical meristem (PO:0020148). Found in Poaceae and other monocotyledons such as Zingiberaceae. Protects the emerging shoot system (PO:0009006) as it grows through the soil.

has super-classes: plant organ^c
has sub-classes: plant embryo coleoptile^c, seedling coleoptile^c

coleoptile emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007045

Occurs in Poaceae and some other monocotyledons. May occur simultaneously with coleoptile emergence from the growth medium. The actual point of emergence from the seed coat (PO:0009088) may not be observed if the seed (PO:0009010) is underneath a growth medium. In a fruit (PO:0009001) with a persistent pericarp (PO:0009084), emergence from the seed coat may not be observed. If the fruit is a caryopsis, the dry pericarp is fused with the seed coat, and emergence from the pericarp is simultaneous with emergence from the seed coat. This terms is used only for seed plants.

has super-classes: sporophyte vegetative stage^c; part_of^op some seed germination stage^c

coleorhiza^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020034

Found in Poaceae and some other monocots as well as some gymnosperms. Protects the emerging radicle in a plant embryo or seedling. The parenchyma cells of both the coleorhiza and epiblast may function in storage.

has super-classes: plant organ^c
has sub-classes: embryo coleorhiza^c, seedling coleorhiza^c

coleorhiza emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025475

has super-classes: b f o 0000003; root development stage^c; part_of^op some seed germination stage^c

collective leaf structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025022

This term replaces the obsolete term leaf whorl (PO:0008034). If you are looking for annotations for PO:0008034, please use this term instead.

has super-classes: collective phyllome structure^c
has sub-classes: rosette^c

collective organ part structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025269

A collective organ part structure is composed of parts of multiple organs, but no complete organs. The organ parts are often of the same type but may be of different types. Includes plant structures like a septum (PO:0000030) that consists of the walls of two fused carpels (PO:0009030) or a pseudostem (PO:0025248) that consist of multiple, overlapping leaf sheaths (PO:0020104). Unlike a collective plant organ structure (PO:0025007), a collective organ part structure does not contain any complete plant organs.

has super-classes: collective plant structure^c; has_part^op some style^c; has_part^op some stigma^c
has sub-classes: corolla spur^c, fruit operculum^c, pappus^c, pseudostem^c, septum^c, silk^c
is disjoint with: vascular system^c, plant cell^c, portion of plant tissue^c

collective phyllome structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025023

has super-classes: collective plant organ structure^c
has sub-classes: androecium^c, calyx^c, caryopsis hull^c, collective leaf structure^c, corolla^c, epicalyx^c, gametophyte perianth^c, gynoecium^c, involucre^c, keel^c, perianth^c

collective phyllome structure development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025578

has super-classes: collective plant organ structure development stage^c
has sub-classes: androecium development stage^c, calyx development stage^c, corolla development stage^c, gynoecium development stage^c

collective plant organ structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025007

Organs can be of the same type or different types. Examples include flower (PO:0009046), perianth (PO:0009058), and inflorescence (PO:0009049). See also collective organ part structure (PO:0025269), for plant structures composed of parts of multiple organs, but no complete plant organs. This was formerly named collective plant structure.

has super-classes: collective plant structure^c; has_part^op some plant organ^c
has sub-classes: anther^c, anther theca^c, ceonosorus^c, collective phyllome structure^c, gametophyte coma^c, root system^c, shoot system^c, sorus^c
is disjoint with: vascular system^c, plant cell^c, portion of plant tissue^c

collective plant organ structure development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025338

Includes flower development stage (PO:0007615), corolla development stage (PO:0007604), and inflorescence development stage (PO:0001083).

has super-classes: b f o 0000003; plant structure development stage^c; has_participant^op some collective plant organ structure^c
has sub-classes: collective phyllome structure development stage^c, shoot system development stage^c

collective plant structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025497

This is a parent term to describe both collective organ part structure (PO:0025269) (e.g. septum), as well as collective plant organ structure (PO:0025007) (which was formerly named collective plant structure), for example shoot system (PO:0009006).

has super-classes: plant structure^c
has sub-classes: collective organ part structure^c, collective plant organ structure^c

collective tepal structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025021

This structure is a perianth (PO:0009058) where there is no differentiation between calyx (PO:0009060) and corolla (PO:0009059).

has super-classes: perianth^c
has sub-classes: fused collective tepal structure^c

collenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005423

has super-classes: portion of ground tissue^c

collenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000075

has super-classes: ground tissue cell^c; part_of^op some collenchyma^c

columella^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025230

has super-classes: portion of plant tissue^c
has sub-classes: fruit columella^c, spore capsule columella^c

columella root cap cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020132

has super-classes: b f o 0000004; ground tissue cell^c; develops_from^op some columella root cap initial cell^c

columella root cap initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020133

has super-classes: root initial cell^c

coma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020061

has super-classes: c a r o 0000000; seed coat epidermis^c; has_part^op some seed trichome^c

companion cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000071

Companion cells are connected to sieve tube elements through plasmodesmata and function in phloem loading of small molecules, including photosynthate (either sucrose or raffinose-family oligosaccharides). May participate in phloem sucrose loading (GO:0009915). Molecules can be loaded into the companion cells from surrounding cells through either symplastic (via plasmodesmata) or apoplastic (transmembrane) transport. Unlike sieve tube elements, companion cells retain their nuclei and other organelles at maturity. A sieve tube element may have one or more or no companion cells associated with it. This term should not be used for other types of parenchyma cells (PO:0000074) that do not arise from the same phloem mother cell as a sieve tube element. Companion cells are found in angiosperms, as compared to albuminous cells (PO:0025412), which are found in non-angiosperm vascular plants. Companion cells may be specialized as transfer companion cells (PO:0025458), ordinary companion cells (PO:0025459), or intermediary companion cells (PO:0025460). Multiple types of companion cells may be found in the same plant.

has super-classes: b f o 0000004; parenchyma cell^c; part_of^op some phloem^c; adjacent_to^op some sieve tube element^c
has sub-classes: intermediary companion cell^c, ordinary companion cell^c, transfer companion cell^c

compound capitulum inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030122

Examples include many species of daisy family (Asteraceae). The second order inflorescences (PO:0025240) of compound capitulum inflorescences are often called glomerules.

has super-classes: inflorescence^c

compound cincinnus inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030133

Examples include some species of the Forget-me-not family (Boraginaceae).

has super-classes: inflorescence^c

compound drepanium inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030136

Examples include some species of the Forget-me-not family (Boraginaceae).

has super-classes: inflorescence^c

compound leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020043

has super-classes: vascular leaf^c
has sub-classes: palmate leaf^c, pinnate leaf^c

compound raceme inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030116

Examples include many species Brassicaceae, such as pepperweeds (Lepidium spp.), and Fabaceae, such as melilot (Melilotus officinialis) and hop trefoil (Trifolium campestre) species, as well as bananas (Musa spp.; Musaceae).

has super-classes: inflorescence^c

compound spike inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030118

Examples include some amaranth species (Amaranthus spp., Amaranthaceae).

has super-classes: inflorescence^c

compound umbel inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030130

The flowers (PO:0009046) of a compound umbel inflorescence appear as clusters originating from a single point, due to compression of inflorescence axis internodes (PO:0006326) of the higher order inflorescence axes (PO:0009081). Examples include species of the Ivy family (Apiaceae or Umbelliferae), including dill (Anethum graveolens), fennel (Foeniculum vulgare, Apiaceae) and poison hemlock (Conium maculatum, Apiaceae).

has super-classes: inflorescence^c

compression wood^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025473

Develops as a response to gravity (compression) and may function in restoring a stem (PO:0009047) or branch (PO:0025073) that is leaning to its original position. Found in gymnosperms.

has super-classes: reaction wood^c

connective^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009068

has super-classes: cardinal organ part^c; part_of^op some anther^c

contact cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004002

Not used in current plant literature.

cork cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005599

Cork cambium is located between the phellem and phelloderm and produces phellem toward the outside and phelloderm toward the inside of a plant axis (PO:0025004).

has super-classes: cambium^c; part_of^op some periderm^c
has sub-classes: root cork cambium^c, shoot axis cork cambium^c

corm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025355

May serve as a storage or perennating organ. Usually underground. A corm differs from a bulb (PO:0025356) in that it does not have fleshy leaves or leaf bases but usually has scale leaves or remnants of dry leaf sheaths that form a protective covering around it. May bear remnants or scars of detached leaves. Adventitious roots may develop from the base of a corm, and these may be contractile, pulling the corm into the soil. Examples include Gladiolus and Crocus. The pseudobulb of an orchid is equivalent to a corm. A corm is very similar to a rhizome (PO:0004542) with very short sympodial units, although not all corms have sympodial growth.

has super-classes: shoot system^c

corolla^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009059

The corolla (PO:0009059) is part of the perianth (PO:0009058). This definition is based on the complete flower, which has all four whorls. In many species, and in mutants one or more of the whorls may be missing. The corolla (PO:0009059) often functions to attract pollinators.

has super-classes: collective phyllome structure^c; part_of^op some perianth^c
has sub-classes: fused corolla^c

corolla development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007604

has super-classes: collective phyllome structure development stage^c; part_of^op some floral organ differentiation stage^c
has sub-classes: fully expanded petal stage^c, petal differentiation and expansion stage^c, petal primordium visible stage^c

corolla spur^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025512

Often contains nectar. Use this term if the spur is part of two or more fused petals (PO:0009032). If the spur is part of a single petal, use petal spur (PO:0025511).

has super-classes: collective organ part structure^c; part_of^op some corolla^c

corpus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006301

The term has been made obsolete because this concept is used in a very loose sense.

cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005708

has super-classes: portion of ground tissue^c
has sub-classes: embryo cortex^c, paraclade cortex^c, pedicel cortex^c, petiole cortex^c, receptacle cortex^c, root cortex^c, shoot axis cortex^c, tuber cortex^c

corymb inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030124

Examples include highbush blueberry (Vaccinium corymbosum; Ericaceae).

has super-classes: inflorescence^c

costa^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030072

Found in bryophytes. Often contains both hydrome and leptome. Functions in support and conduction in a phyllid. The term costa is sometimes used for the midrib of monocot leaves, but this ontology class should only be used for non-vascular leaves.

has super-classes: portion of plant tissue^c; part_of^op some non-vascular leaf^c

cotyledon^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020030

has super-classes: vascular leaf^c; develops_from^op some cotyledon primordium^c
has sub-classes: plant embryo cotyledon^c, seedling cotyledon^c

cotyledon abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006057

has super-classes: cotyledon epidermis^c

cotyledon adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006058

has super-classes: cotyledon epidermis^c

cotyledon anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025432

has super-classes: portion of embryo plant tissue^c; phyllome anlagen^c

cotyledon emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007049

This term is used only for seed plants. The actual point of emergence from the seed coat (PO:0009088) may not be observed if the seed is underneath a growth medium, especially in plants with hypogeal germination. In a fruit (PO:0009001) with a persistent pericarp (PO:0009084), emergence from the seed coat may not be observed.

has super-classes: seedling development stage^c

cotyledon epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006056

has super-classes: leaf epidermis^c; part_of^op some cotyledon^c
has sub-classes: cotyledon abaxial epidermis^c, cotyledon adaxial epidermis^c

cotyledon margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025012

has super-classes: leaf margin^c; part_of^op some cotyledon^c

cotyledon primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000015

has super-classes: phyllome primordium^c; part_of^op some vegetative shoot apex^c; develops_from^op some cotyledon anlagen^c

cotyledon vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000035

has super-classes: vascular system^c; part_of^op some cotyledon^c

cotyledonary node^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025321

has super-classes: stem node^c

cotyledonary node rhizoid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025320

Found in some monocots.

has super-classes: epidermal rhizoid^c

crown root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000043

has super-classes: shoot-borne nodal root^c

crown root emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007518

Crown root stages are based on rice plant.

has super-classes: root emergence stage^c

crown root primordium formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007504

Crown root primordia formed endogenously opposite the collateral bundles in maize.

has super-classes: 1 root primordium formation stage^c

cultured plant callus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000009

Cultured plant callus may induced to form from plant protoplasts or cultured plant cells in suspension culture. After supplementation with the appropriate plant growth regulators, further differentiation may lead to the development of plant tissues, plant organs and ultimately, a whole plant.

has super-classes: in vitro plant structure^c; plant callus^c; has_part^op some cultured plant cell^c
has sub-classes: embryogenic callus^c, organogenic callus^c

cultured plant cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000005

Includes isolated plant cells and small plant cell aggregates that proliferate while suspended in sterile liquid medium or spread on a solid agar medium.

has super-classes: in vitro plant structure^c; plant cell^c
has sub-classes: leaf-derived cultured plant cell^c, plant protoplast^c, root-derived cultured plant cell^c

cultured plant embryo^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000010

Includes isolated and maintained mature or immature zygotic embryos, somatic embryos or haploid embryos (derived from male gametophyte).

has super-classes: in vitro plant structure^c; plant embryo^c
has sub-classes: cultured somatic plant embryo^c, cultured zygote-derived plant embryo^c

cultured somatic plant embryo^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000011

Cultured somatic plant embryos are commonly induced after the formation of callus from an explant and treatment with plant growth regulators.

has super-classes: b f o 0000004; cultured plant embryo^c; somatic plant embryo^c; develops_from^op some embryogenic callus^c
has sub-classes: microspore-derived cultured plant embryo^c

cultured zygote-derived plant embryo^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025304

has super-classes: cultured plant embryo^c; zygotic plant embryo^c

cuticular wax^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025386

Also includes triterpenoids and minor secondary metabolites, such as sterols and flavonoids. May be embedded within or external to the layer of cutin of the cuticle proper. Phenotypically, wax is distinguished as the glaucous or whitish bloom on a part of a plant shoot system that corresponds to crystalloid epicuticular wax with light scattering capacity.

has super-classes: portion of plant substance^c; part_of^op some plant cuticle^c
has sub-classes: epicuticular wax^c, intercuticular wax^c

cutin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025385

Cutin is the insoluble, covalently cross-linked polymer that forms an electron dense layer over the epidermal cells (PO:0004013) of an aerial plant structure.

has super-classes: portion of plant substance^c; part_of^op some plant cuticle^c; part_of^op some plant cuticle proper^c

cyme inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030126

Cyme inflorescence is used here to treat inflorescences that are commonly referred to as dichasial, pleiochasial, or polychasial cymes; each of which are named according to the number of higher order inflorescence axes at a single axis. Cyme is not used here to treat monochasial cymose inflorescences, which contain at least one repeating sympodial unit, such as cincinnus inflorescence (PO:0030132), compound cincinnus inflorescence (PO:0030133), bostryx (PO:0030134), rhipidium inflorescence (PO:0030131), drepanium inflorescence (PO:0030135), and compound drepanium inflorescence (PO:0030136). Examples include many species of the Figwort family (Scrophulariaceae, including green figwort Scrophularia umbrosa) and the Verbena family (Verbenaceae).

has super-classes: inflorescence^c

D locules established stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001026

has super-classes: anther development stage^c

D megaspore degeneration stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007626

In some plants more than one megaspore contributes to the megametophyte.

has super-classes: megagametophyte development stage^c

D pollen mother cell meiosis stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001009

has super-classes: pollen development stage^c

degenerate megaspore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000245

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: megaspore^c

dehiscence zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025092

has super-classes: portion of plant tissue^c
has sub-classes: anther dehiscence zone^c, fruit dehiscence zone^c, spore capsule annulus^c

dehiscent fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020064

dermal tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009014

This term is redundant with epidermis and will be obsoleted. Move annotations to epidermis.

determinate nodule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004539

Nodules are not persistent.

has super-classes: root nodule^c

determinate thyrse inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030128

The higher order inflorescence axes (PO:0009081) of an determinate thyrse inflorescence may have either a monopodial or sympodial growth habit depending on whether single or paired inflorescence axillary meristems (PO:0009105) develop at each axis. Examples include lilacs (Syringia spp.; Oleaceae), buckeyes (Aesculus spp.; Hippocastanaceae) and hydrangea (Hydrangea paniculata; Hydrangeaceae).

has super-classes: inflorescence^c

developing seed stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004506

has super-classes: b f o 0000003; seed development stage^c; preceded_by^op some endosperm development stage^c

diarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025559

has super-classes: root system exarch protoxylem^c

disk flower^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025332

Found in the Asteraceae. May be actinomorphic or bilabiate, often bisexual. Usually surrounded by and different in form from ray flowers (PO:0025331).

has super-classes: flower^c

drepanium inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030135

Examples include tomato (Lycopersicum esculentum; Solanaceae).

has super-classes: inflorescence^c

drupe fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030103

May develop from an inferior or superior carpel (PO:0009030) and may contain one or more seeds (PO:0009010). Examples: Amborella trichopoda (basal angiosperm), coffee (Coffea canephora), Cornaceae (Davidia spp.), cashew (Anacardium occidentale), coconut (Cocos nucifera), and almond, peach and plum (Prunus spp.).

has super-classes: fruit^c

dry seed stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001040

has super-classes: b f o 0000003; seed development stage^c; preceded_by^op some seed maturation stage^c

E anther wall tapetum degeneration initiated stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001032

Microspores within single locule are at unicellular stage.

has super-classes: anther development stage^c

E emerged root elongation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007529

E tetrad stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001029

has super-classes: pollen development stage^c

E two nucleate megagametophyte stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007627

has super-classes: megagametophyte development stage^c

ear apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006375

has super-classes: inflorescence apical meristem^c; ear meristem^c; part_of^op some first order ear inflorescence axis^c

ear floret^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006354

The ear floret (PO:0006354) initiates both carpels (PO:0009030) and stamens (PO:0009029), but all stamens abort during development. Found in Zea spp.

has super-classes: spikelet floret^c; pistillate flower^c; part_of^op some ear spikelet^c
has sub-classes: lower floret of pedicellate spikelet of ear^c, lower floret of sessile spikelet of ear^c, upper floret of pedicellate spikelet of ear^c, upper floret of sessile spikelet of ear^c

ear inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020136

has super-classes: pistillate inflorescence^c

ear inflorescence axillary meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009110

has super-classes: inflorescence axillary meristem^c; ear meristem^c
has sub-classes: ear spikelet pair meristem^c

ear infructescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025597

has super-classes: infructescence^c; develops_from^op some ear inflorescence^c

ear infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025623

has super-classes: first order infructescence axis^c

ear meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009109

is equivalent to: inflorescence meristem^c and (part_of^op some ear inflorescence^c)
has super-classes: inflorescence meristem^c; part_of^op some ear inflorescence^c
has sub-classes: ear apical meristem^c, ear inflorescence axillary meristem^c, ear spikelet meristem^c

ear pedicellate spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006348

Develops from the ear spikelet pair meristem (PO:0006360).

has super-classes: ear spikelet^c

ear peduncle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006418

has super-classes: peduncle^c; part_of^op some ear inflorescence^c

ear sessile spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006349

Develops from the ear spikelet pair meristem (PO:0006360).

has super-classes: ear spikelet^c

ear spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006320

The ear spikelet forms with two ear florets (PO:0006354), but the lower one aborts during development.

has super-classes: spikelet^c; part_of^op some ear inflorescence^c
has sub-classes: ear pedicellate spikelet^c, ear sessile spikelet^c

ear spikelet meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006378

has super-classes: spikelet meristem^c; ear meristem^c

ear spikelet pair meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006360

has super-classes: spikelet pair meristem^c; ear inflorescence axillary meristem^c

ear spikelet rachilla^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006380

has super-classes: spikelet rachilla^c; part_of^op some ear spikelet^c
has sub-classes: rachilla of pedicellate spikelet of ear^c, rachilla of sessile spikelet of ear^c

early rosette growth stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007081

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: rosette growth stage^c

early whole plant fruit ripening stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007001

has super-classes: whole plant fruit ripening stage^c

early wood^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004515

The transition from early wood to late wood may be gradual and is not always easy to distinguish.

has super-classes: secondary xylem^c; part_of^op some growth ring^c

early wood tracheary element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025461

Early wood tracheary elements generally have larger cell lumens than late wood tracheary elements (PO:0025462) of the same growth ring (PO:0004514).

is equivalent to: secondary xylem tracheary element^c and (part_of^op some early wood^c)
has super-classes: secondary xylem tracheary element^c; part_of^op some early wood^c

ectexine^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020009

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043669.

egg apparatus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020096

Found in angiosperms.

has super-classes: cardinal organ part^c; part_of^op some embryo sac^c

eighth order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025109

has super-classes: higher order inflorescence axis^c

eighth order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025253

has super-classes: higher order infructescence axis^c

elaiosome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020062

May be a modified arilloid (a type of strophiole or caruncle) or may be an outgrowth of a fruit. May be attractive to ants and aid in dispersal.

has super-classes: cardinal organ part^c

elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020125

This term was made obsolete because the definition was not correct. A new term, root elongation zone (PO:0025181), was created instead.

elongation zone formation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001028

embryo apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025284

The zygote divides to form an embryo apical cell and an embryo basal cell.

has super-classes: b f o 0000004; embryo plant cell^c; sporophyte meristematic apical cell^c; develops_from^op some plant zygote^c

embryo basal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0002002

The zygote divides to form an embryo apical cell and an embryo basal cell.

has super-classes: b f o 0000004; embryo plant cell^c; develops_from^op some plant zygote^c

embryo coleorhiza^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025288

has super-classes: coleorhiza^c; embryo plant structure^c

embryo cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005014

Can occur in the hypocotyl and root.

has super-classes: cortex^c; portion of embryo plant tissue^c

embryo endodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005015

has super-classes: endodermis^c; portion of embryo plant tissue^c

embryo epicotyl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025292

has super-classes: epicotyl^c; embryo plant structure^c

embryo hypocotyl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025290

has super-classes: hypocotyl^c; embryo plant structure^c; part_of^op some plant embryo axis^c

embryo hypocotyl-root junction^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025300

has super-classes: hypocotyl-root junction^c; embryo plant structure^c; part_of^op some plant embryo axis^c

embryo hypophysis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020109

has super-classes: embryo plant cell^c; part_of^op some suspensor^c

embryo leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006338

This term is used to described not yet fully-developed leaves that are part of an embryo.

has super-classes: vascular leaf^c; embryo plant structure^c

embryo mesocotyl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025294

has super-classes: mesocotyl^c; embryo plant structure^c

embryo plant cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025028

is equivalent to: native plant cell^c and (part_of^op some plant embryo^c)
has super-classes: embryo plant structure^c; native plant cell^c
has sub-classes: embryo apical cell^c, embryo basal cell^c, embryo hypophysis^c

embryo plant structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025099

Includes plant structures that only occur in embryos (such as suspensor) as well as plant structures that are part of an embryo when a plant is in the embryonic phase (such as embryonic radicle).

is equivalent to: plant structure^c and (part_of^op some plant embryo^c)
has super-classes: plant structure^c; part_of^op some plant embryo^c
has sub-classes: embryo coleorhiza^c, embryo epicotyl^c, embryo hypocotyl^c, embryo hypocotyl-root junction^c, embryo leaf^c, embryo mesocotyl^c, embryo plant cell^c, plant embryo axis^c, plant embryo coleoptile^c, plant embryo proper^c, plant embryo radicle^c, plumule^c, portion of embryo plant tissue^c, scutellar node^c, scutellum^c, suspensor^c

embryo root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000045

has super-classes: root^c
has sub-classes: radicle^c, seminal root^c

embryo sac^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025074

Produces an embryo sac egg cell (PO:0025123).

has super-classes: b f o 0000040; megagametophyte^c; located_in^op some plant ovary ovule^c; develops_from^op some megaspore^c

embryo sac cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025026

is equivalent to: native plant cell^c and (part_of^op some embryo sac^c)
has super-classes: native plant cell^c; part_of^op some embryo sac^c
has sub-classes: antipodal cell^c, embryo sac central cell^c, embryo sac egg cell^c, primary endosperm cell^c, synergid^c

embryo sac central cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020090

In most angiosperms, the embryo sac central cell contains two polar nuclei, and, after double fertilization, develops into an endosperm. In some angiosperms, such as Illicium, the embryo sac central cell contains a single polar nucleus. Embryo sac central cell is distinct from archegonium central cell (PO:0025509).

has super-classes: embryo sac cell^c

embryo sac egg cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025123

The egg apparatus is part of an embryo sac (PO:0025074).

has super-classes: plant egg cell^c; embryo sac cell^c; part_of^op some egg apparatus^c

embryo shoot apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006362

has super-classes: vegetative shoot apical meristem^c; portion of embryo plant tissue^c; part_of^op some plant embryo axis^c

embryogenic callus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006091

Somatic embryos may be formed after the cultured plant callus is treated with plant growth regulators.

has super-classes: cultured plant callus^c

endarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025557

Endarch protoxylem is typically found in stems of seed plants, and also in leaves in which the protoxylem is on the adaxial side.

has super-classes: protoxylem^c

endexine^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020010

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043671.

endocarp^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009086

has super-classes: portion of plant tissue^c; part_of^op some pericarp^c

endodermal passage cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006208

has super-classes: passage cell^c; part_of^op some endodermis^c

endodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000252

Forms a sheath around the vascular system. It may have secondary walls later, part_of cortex.

has super-classes: portion of ground tissue^c; part_of^op some cortex^c
has sub-classes: embryo endodermis^c, hypocotyl endodermis^c, leaf endodermis^c, root endodermis^c, shoot axis endodermis^c

endosperm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009089

In angiosperms the endosperm is usually triploid and formed after fertilization by the fusion of one gamete with the polar nucleus (GO:0043078); sometimes diploid or polyploid.

has super-classes: portion of plant tissue^c; part_of^op some seed^c
has sub-classes: cellular endosperm^c, free nuclear endosperm^c, helobial endosperm^c

endosperm development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007633

has super-classes: b f o 0000003; seed development stage^c; preceded_by^op some fertilized ovule stage^c
has sub-classes: chalazal and micropylar domain establishment stage^c, functional specialization of the endosperm stage^c, primary endosperm cell stage^c

endosperm parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005415

Often devoid of intercellular spaces.

has super-classes: seed storage parenchyma^c; part_of^op some endosperm^c

endotegmen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006219

has super-classes: seed coat epidermis^c; part_of^op some tegmen^c

endotesta^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006051

has super-classes: seed coat epidermis^c; part_of^op some testa^c

endothelium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020024

has super-classes: portion of plant tissue^c; part_of^op some inner integument^c

ensiform vascular leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025333

Common in many monocots and some dicots. Note that ensiform leaves have two sides, but both sides arise from the same surface of the leaf meristem (abaxial or adaxial). In some leaves, the petiole may twist, giving the appearance that the lamina is ensiform, but it is not.

has super-classes: unifacial vascular leaf^c
has sub-classes: phyllode leaf^c, transition phyllode leaf^c

epiblast^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020036

The parenchyma cells of both the coleorhiza and epiblast may function in storage. Some researchers consider the epiblast and coleorhiza independent structures that differentiate from the same proembryonic tissue.

has super-classes: portion of plant tissue^c; part_of^op some coleorhiza^c

epicalyx^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009063

has super-classes: collective phyllome structure^c; part_of^op some flower^c

epicalyx bract^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025577

has super-classes: flower bract^c; part_of^op some epicalyx^c

epicormic shoot system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004546

has super-classes: shoot-borne shoot system^c

epicotyl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020035

has super-classes: b f o 0000002; stem internode^c; participates_in^op some epicotyl emergence stage^c
has sub-classes: embryo epicotyl^c, seedling epicotyl^c

epicotyl emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007054

Occurs in plants with hypogeal germination such as pea (pisum sativum). The actual point of emergence from the seed coat (PO:0009088) may not be observed if the seed (PO:0009010) is underneath a growth medium. In a fruit (PO:0009001) with a persistent pericarp (PO:0009084), emergence from the seed coat may not be observed.

has super-classes: seedling development stage^c

epicuticular wax^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025388

Epicuticular waxes may take a variety of forms, such as plates, ribbons, tubes, and rods.

has super-classes: b f o 0000004; cuticular wax^c; adjacent_to^op some plant cuticle proper^c

epidermal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004013

has super-classes: native plant cell^c; part_of^op some epidermis^c
has sub-classes: resin cell^c, root epidermal cell^c, shoot epidermal cell^c

epidermal cork cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000041

Developmentally different from periderm cork cell (i.e., phellem), produced by cork cambium. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025).

has super-classes: short cell^c

epidermal initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000349

has super-classes: initial cell^c; part_of^op some epidermis^c
has sub-classes: epidermal rhizoid initial cell^c, stomatal initial cell^c
is disjoint with: root initial cell^c, cambial initial cell^c, protonema side branch initial cell^c, protonema sub-apical initial cell^c

epidermal pavement cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000332

May have sinuous anticlinal cell walls that overall give a jigsaw like appearance to the epidermis. Pavement cells are epidermal cells that are not directly associated with a stomatal complex or trichome at maturity, but they share similar developmental origins.

has super-classes: b f o 0000004; shoot epidermal cell^c; develops_from^op some epidermal initial cell^c
has sub-classes: leaf pavement cell^c, papilla cell^c, sepal epidermis giant cell^c
is disjoint with: socket cell^c, subsidiary cell^c, guard cell^c, trichome cell^c

epidermal rhizoid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030071

Found in bryophytes and pteridophytes growing from the epidermis of a gametophore or the lower surface of a thallus and in some monocots growing from the stem at the cotyledonary node. May be considered a type of trichome.

has super-classes: b f o 0000004; rhizoid^c; develops_from^op some epidermal rhizoid initial cell^c
has sub-classes: cotyledonary node rhizoid^c

epidermal rhizoid initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030068

Part of the epidermis of a thallus or gametophore of a bryophyte or pteridophyte in the gametophytic phase or the stem of a monocot in the sporophytic phase.

has super-classes: epidermal initial cell^c

epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005679

The epidermis can be composed of one or more layers of cells. In some species of vascular plants, the epidermis, which is a primary tissue, is replaced by periderm, which is secondary tissue, later in development. The epidermis can also include trichomes, stomatal pores, root hairs, and rhizoids.

has super-classes: b f o 0000004; portion of plant tissue^c; develops_from^op some protoderm^c
has sub-classes: exothecium^c, integument epidermis^c, prickle^c, root epidermis^c, seed coat epidermis^c, shoot system epidermis^c

epiphragm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030054

Present in some moss species of the family Polytrichaceae.

has super-classes: parenchyma^c; part_of^op some sporangium^c

epithelium cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004004

Functional term

epithem cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000066

Proposed to be involved in the retrieval of solutes from the xylem sap.

has super-classes: parenchyma cell^c; part_of^op some hydathode^c

establishment of initial cells^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007523

exarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025554

has super-classes: protoxylem^c
has sub-classes: root system exarch protoxylem^c, shoot system exarch protoxylem^c

exine^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020008

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043668.

exocarp^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009085

has super-classes: portion of plant tissue^c; part_of^op some pericarp^c

exodermal passage cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006207

has super-classes: passage cell^c; part_of^op some exodermis^c

exodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005772

The cell walls are thickened and contain suberin. Absent in pteridophytes, fibrous in Phoenix and accompanied by sclerenchyma in Ananas.

has super-classes: hypodermis^c; part_of^op some root cortex^c

exotegmen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006218

has super-classes: seed coat epidermis^c; part_of^op some tegmen^c

exotesta^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006050

has super-classes: seed coat epidermis^c; part_of^op some testa^c

exothecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030073

Develops from the outermost layer of an amphithecium in bryophytes.

is equivalent to: epidermis^c and (part_of^op some sporangium wall^c)
has super-classes: epidermis^c; part_of^op some sporangium wall^c
has sub-classes: megasporangium exothecium^c, microsporangium exothecium^c

extrafloral nectary^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009057

An extrafloral nectary may occur on vegetative plant structures (PO:0009011) such as a stem (PO:0009047), leaf (PO:0009025), petiole (PO:0020038), stipule (PO:0020041) or flower pedicel (PO:0009052).

has super-classes: nectary^c

F bilocular anther stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001034

has super-classes: anther development stage^c

F four nucleate megagametophyte stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007628

has super-classes: megagametophyte development stage^c

F microspore release stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001010

has super-classes: pollen development stage^c

F1 root hair initiation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007531

F2 root hair elongation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007526

fascicular cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006200

Found in shoot axes (PO:0025029) and vascular leaves (PO:0009025). Portions of fascicular cambium may merge with interfascular cambium (PO:0006201) or the fascicular cambium from adjacent vascular bundles to form a cylinder, or they may remain isolated.

has super-classes: vascular cambium^c

female archesporial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006015

Found in heterosporous ferns and seed plants. May also give rise to sterile cells. In the majority of flowering plants, including Arabidopsis, the female archesporial cell elongates and polarizes longitudinally, and directly differentiates into the megasporocyte or megaspore mother cell. In some flowering plants, it undergoes a periclinal division, and subsequently the inner cell differentiates into the megasporocyte.

has super-classes: archesporial cell^c; part_of^op some megasporangium^c

fertile lemma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009041

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding spikelet type, if known. Choose the most specific term possible from: ear spikelet (PO:0006320), ear pedicellate spikelet (PO:0006348), ear sessile spikelet (PO:0006349), tassel spikelet (PO:0006309), tassel pedicellate spikelet (PO:0006312), tassel sessile spikelet (PO:0006311).

has super-classes: lemma^c

fertilized ovule stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004505

has super-classes: seed development stage^c

fiber tracheid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000355

Fiber tracheids generally have pointed ends and bordered pits that have lenticular to slit-like apertures. If both libriform fiber cells (PO:0004520) and fiber tracheids are present, the libriform fiber cells usually have thicker walls. Fiber tracheids have bordered pits with smaller pit cavities than the vessel members (PO:0002003) or tracheids (PO:0000301) of the same wood and a distinct pit cavity leading to the cell lumen through the cell wall.

has super-classes: xylem fiber cell^c
has sub-classes: septate fiber tracheid^c

fifth order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025106

has super-classes: higher order inflorescence axis^c

fifth order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025115

has super-classes: higher order infructescence axis^c

filament^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009067

Supports the anthers. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: stalk^c; part_of^op some stamen^c

filament epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006060

is equivalent to: stamen epidermis^c and (part_of^op some filament^c)
has super-classes: stamen epidermis^c; part_of^op some filament^c

filament vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008014

has super-classes: vascular system^c; part_of^op some filament^c; part_of^op some stamen vascular system^c

filiform apparatus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000024

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043680.

first order ear inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006505

has super-classes: first order inflorescence axis^c; part_of^op some ear inflorescence^c

first order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025104

Monopodial inflorescences, such as a raceme inflorescence (PO:0030115), have a centrally-located main axis; this axis is a first order inflorescence axis. In contrast, sympodial inflorescences, such as the riphidium inflorescence (PO:0030131), do not have a centrally-located main axis. The basal-most portion of a first order inflorescence axis is referred to as a peduncle (PO:0009053).

has super-classes: inflorescence axis^c; has_part^op some peduncle^c
has sub-classes: first order ear inflorescence axis^c, first order tassel inflorescence axis^c

first order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025244

has super-classes: infructescence axis^c
has sub-classes: ear infructescence axis^c

first order tassel inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006324

has super-classes: first order inflorescence axis^c; part_of^op some tassel inflorescence^c

FL.00 first flower(s) open stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007026

These first flowers are not necessarily the oldest flowers in the inflorescence. In some cereal plants the flowering starts in the middle of the inflorescence. This stage refers to the whole plant.

has super-classes: whole plant flowering stage^c

FL.01 1/4 of flowers open stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007034

This stage refers to the whole plant.

has super-classes: whole plant flowering stage^c

FL.02 1/2 of flowers open stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007053

This stage refers to the whole plant.

has super-classes: whole plant flowering stage^c

FL.03 3/4 of flowers open stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007052

This stage refers to the whole plant.

has super-classes: whole plant flowering stage^c

FL.04 end of flowering stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007024

This stage refers to the whole plant.

has super-classes: whole plant flowering stage^c

flag leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020103

has super-classes: adult vascular leaf^c

fleshy fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020066

floral epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008043

This term was made obsolete. Its former children were classified as children of either epidermis, phyllome epidermis or shoot epidermis.

floral guard cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008045

This term was made obsolete and replaced by guard cell (PO:0000293) which can be post-composed with individual floral organs, such as petal or sepal.

floral organ^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025395

Includes phyllomes such as anthers and petals, as well as shoot axes such as androphores and gynophores.

is equivalent to: plant organ^c and (part_of^op some flower^c)
has super-classes: plant organ^c; part_of^op some flower^c
has sub-classes: carpel^c, flower bract^c, gynophore^c, lodicule^c, petal^c, plant ovary ovule^c, sepal^c, stamen^c, staminode^c, tepal^c

floral organ abscission zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006502

has super-classes: abscission zone^c; part_of^op some floral organ^c

floral organ differentiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007600

During this stage, the process of floral organ development (GO:0048437) occurs, defined as the process whose specific outcome is the progression of the floral organ over time, from its formation to the mature structure.

has super-classes: floral organ formation stage^c; preceded_by^op some floral organ primordium development stage^c

floral organ formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025585

During this stage, the process of floral organ development (GO:0048437) occurs. Floral organ development is defined as the process whose specific outcome is the progression of the floral organ over time, from its formation to the mature structure.

has super-classes: b f o 0000003; plant organ development stage^c; part_of^op some flower development stage^c; preceded_by^op some flower meristem transition stage^c
has sub-classes: floral organ differentiation stage^c, floral organ meristem development stage^c, floral organ primordium development stage^c

floral organ meristem development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007601

During this stage, the process of floral meristem growth (GO:0010451) occurs. This process is defined as the increase in size or mass of a floral meristem, a population of undifferentiated cells in a plant that gives rise to a flower.

has super-classes: floral organ formation stage^c

floral organ primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025477

If annotating to a primordium of a floral structure, it is better to use the more specific term, such as petal primordium (PO:0000021) or anther primordium (PO:0006089).

has super-classes: primordium^c; part_of^op some reproductive shoot apex^c
has sub-classes: androecium primordium^c, anther primordium^c, carpel primordium^c, flower bract primordium^c, gynoecium primordium^c, lodicule primordium^c, ovule primordium^c, petal primordium^c, sepal primordium^c, stamen primordium^c

floral organ primordium development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007602

During this stage, the process of floral meristem determinacy (GO:0010582) occurs, where a floral meristem becomes determinate (i.e. ceases to produce lateral organs and may or may not terminally differentiate). This stage may be indicated by a slight indentation to the inflorescence meristem.

has super-classes: floral organ formation stage^c; preceded_by^op some floral organ meristem development stage^c

floral stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008044

This term was made obsolete and replaced by the stomatal complexes of individual floral organs, such as petal stomatal complex or sepal stomatal complex.

floral stomatal pore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008046

This term was made obsolete and replaced by stomatal pore (PO:0008032), which can be post-composed with individual floral organs, such as petal or sepal.

flower^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009046

The characteristic reproductive structure of angiosperms. May have as part one or more petals, sepals or tepals. May contain one or more pistillode (PO:0009078), staminode (PO:0009077) or other aborted organs that don't show up in mature form.

has super-classes: b f o 0000004; reproductive shoot system^c; develops_from^op some flower meristem^c
has sub-classes: disk flower^c, pistillate flower^c, spikelet floret^c, staminate flower^c

flower bract^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009034

has super-classes: bract^c; floral organ^c; develops_from^op some flower bract primordium^c
has sub-classes: epicalyx bract^c, lemma^c, palea^c

flower bract primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025488

has super-classes: floral organ primordium^c; bract primordium^c

flower bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000056

has super-classes: reproductive bud^c
has sub-classes: axillary flower bud^c, terminal flower bud^c

flower development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007615

This term and its sub-classes apply to an individual flower (PO:000904). During this stage, a flower undergoes the process of flower development (GO:0009908), defined as the process whose specific outcome is the progression of the flower over time, from its formation to the mature structure. For the development stage of a whole plant (PO:0000003), use whole plant flowering stage (PO:0007016).

has super-classes: reproductive shoot system development stage^c; has_participant^op some flower^c
has sub-classes: flower meristem transition stage^c, flowering stage^c

flower fascicle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025323

A fascicle appears to be a cluster of flowers in an axil of a single bract of the main inflorescence. Fascicles are common in some sections of the Fabaceae, where they are second order inflorescences.

has super-classes: reproductive shoot system^c

flower meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000229

In Zea mays and other grasses, the floret meristem is part of a spikelet and develops into a specific type of floret. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the spikelet type that the meristem is part of. Choose the most specific term possible from: spikelet (PO:0009051), ear spikelet (PO:0006320), ear pedicellate spikelet (PO:0006348), ear sessile spikelet (PO:0006349), tassel spikelet (PO:0006309), tassel pedicellate spikelet (PO:0006312), tassel sessile spikelet (PO:0006311).

has super-classes: reproductive shoot apical meristem^c

flower meristem transition stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025588

During this stage, a process occurs involving a vegetative to reproductive phase transition of meristem (GO:0010228), defined as the process involved in transforming a meristem that produces vegetative structures, such as leaves, into a meristem that produces reproductive structures, such as a flower or an inflorescence.

has super-classes: flower development stage^c

flower nectary^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009056

A flower nectary may occur on a sepal (PO:0009031), petal (PO:0009032), stamen (PO:0009029), plant ovary (PO:0009072), or receptacle (PO:0009064).

has super-classes: nectary^c; part_of^op some flower^c

flower pedicel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030113

has super-classes: pedicel^c
has sub-classes: inflorescence flower pedicel^c

flower pedicel abscission zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025608

has super-classes: abscission zone^c; part_of^op some flower pedicel^c

flower primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004706

This term was made obsolete because it is ambiguous. Use flower meristem (PO:0000229) or floral structure primordium (PO:0025477) instead. If annotating to a primordium of a floral structure, it is better to use the more specific term, such as petal primordium (PO:0000021) or anther primordium (PO:0006089).

flower vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005017

Because a vascular system is defined as the totality of the portions of vascular tissue in a plant structure, the vascular systems of floral parts are part of the flower vascular system.

has super-classes: shoot system vascular system^c; part_of^op some flower^c

flowering stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007616

In most species, flowering stage (anthesis) is when the flower is open and ends with pollination. During this stage, the process of anther dehiscence (GO:0009901) usually occurs, defined as the dehiscence of an anther to release the pollen grains contained within it. This term applies to an individual flower (PO:000904).

has super-classes: flower development stage^c; preceded_by^op some floral organ formation stage^c

follicle fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030105

Examples: milkweed (Asclepias syriaca) and carolina larkspur (Delphinium carolinianum).

has super-classes: fruit^c

foot layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020016

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043670.

formation of aleurone and starchy layers stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001099

has super-classes: functional specialization of the endosperm stage^c

formation of ligule primordium stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001021

has super-classes: vascular leaf expansion stage^c

formation of starchy endosperm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001098

formation of vascular leaflet primordia stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004500

has super-classes: vascular leaf expansion stage^c

fourth order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025105

has super-classes: higher order inflorescence axis^c

fourth order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025114

has super-classes: higher order infructescence axis^c

free ending veinlet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025390

May be branched or simple. May be found inside a lamina areole. Usually used with third order or higher veins. If vein order is known, an additional annotation should be place on secondary vein (PO:0020140), tertiary vein (PO:0008021), quaternary vein (PO:0008022), or higher order vein (PO:0008023).

has super-classes: leaf lamina vein^c

free nuclear endosperm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000198

has super-classes: endosperm^c

free petal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025569

A free petal (PO:0025569) only occurs in a perianth (PO:0009058) that contains fused sepals (PO:0025584) and/or fused petals (PO:0025583). If you are describing a petal (PO:0009032) that is part of a perianth (PO:0009058) where none of the sepals (PO:0009031) and/or petals (PO:0009032) are fused, you should use petal.

has super-classes: petal^c

free sepal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025587

A free sepal (PO:0025587) only occurs in a perianth (PO:0009058) that contains fused sepals (PO:0025584) and/or fused petals (PO:0025583). If you are describing a sepal (PO:0009031) that is part of a perianth (PO:0009058) where none of the sepals (PO:0009031) and/or petals (PO:0009032) are fused, you should use sepal.

has super-classes: sepal^c

free tepal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025136

A free tepal (PO:0025136) only occurs in a perianth (PO:0009058) that contains a fused collective tepal structure (PO:0025138). If you are describing a tepal (PO:0025137) that is part of a perianth (PO:0009058) where none of the tepals (PO:0009033) are fused, you should use tepal.

has super-classes: tepal^c
is disjoint with: fused tepal^c

fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009001

A fruit (PO:0009001) may contain additional plant structures (PO:0009011) that were part of a flower (PO:0009046) and mature along with the gynoecium, such as a receptacle (PO:0009064). A fruit may develop without fertilization in cases of parthenocarpy, apomixis, or other hormone-induced conditions and may not always contain seeds (PO:0009010). When annotating to fruit (PO:0009001) that are referred to as ‘aggregate’, ‘multiple’, or ‘compound’, please annotate directly to the appropriate plant structure, such as receptacle, hypanthium (PO:0009065) or infructescence (PO:0006342). Fruits only occur in angiosperms.

has super-classes: b f o 0000004; multi-tissue plant structure^c; develops_from^op some gynoecium^c
has sub-classes: achene fruit^c, berry fruit^c, capsule fruit^c, caryopsis fruit^c, drupe fruit^c, follicle fruit^c, legume fruit^c, nut fruit^c, samara fruit^c, schizocarp fruit^c, silique fruit^c

fruit abscission zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006503

If you are annotating to this term, please add an additional annotation to the specific type of fruit (PO:0009001), such as achene fruit (PO:0030107), berry fruit (PO:0030108), capsule fruit (PO:0030091), caryopsis fruit (PO:0030104), drupe fruit (PO:0030103), follicle fruit (PO:0030105), legume fruit (PO:0030100), nut fruit (PO:0030102), samara fruit (PO:0030099), schizocarp fruit (PO:0030098), silique fruit (PO:0030106), or their subclasses, depending on the species.

has super-classes: abscission zone^c; part_of^op some fruit^c

fruit columella^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004540

has super-classes: columella^c; part_of^op some fruit^c

fruit dehiscence zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004707

Upon fruit maturation by drying, undergoes cell separation, allowing the valves to detach from the replum and seeds to be dispersed. If you are annotating to this term, please add an additional annotation to the specific type of fruit (PO:0009001), such as achene fruit (PO:0030107), berry fruit (PO:0030108), capsule fruit (PO:0030091), caryopsis fruit (PO:0030104), drupe fruit (PO:0030103), follicle fruit (PO:0030105), legume fruit (PO:0030100), nut fruit (PO:0030102), samara fruit (PO:0030099), schizocarp fruit (PO:0030098), silique fruit (PO:0030106), or their subclasses, depending on the species.

has super-classes: dehiscence zone^c; part_of^op some fruit^c

fruit development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001002

Defined by characteristic morphological, structural, histological or other visible features of a fruit. Includes as subclasses fruit formation stage (PO:0025501) and fruit ripening stage (PO:0025502). May have as part a seed development stage (PO:0001170). This stage applies to an individual fruit. For development stages of a whole plant (PO:0000003) based on fruit development, use whole plant fruit development stage (PO:0025500) or its subclasses.

has super-classes: multi-tissue plant structure development stage^c
has sub-classes: fruit formation stage^c, fruit ripening stage^c

fruit distal end^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008001

has super-classes: cardinal part of multi-tissue plant structure^c; part_of^op some fruit^c

fruit formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025501

A fruit formation stage may begin without fertilization or formation of a plant zygote (PO:0000423) in cases of parthenocarpy, apomixis, or other hormone-induced conditions. This stage applies to an individual fruit. For the development stage of a whole plant (PO:0000003), use whole plant fruit formation stage (PO:0007042).

has super-classes: b f o 0000003; fruit development stage^c; has_participant^op some fruit^c
has sub-classes: fruit initiation stage^c, fruit size 10 to 30% stage^c, fruit size 30 to 50% stage^c, fruit size 50 to 70% stage^c, fruit size 70% to final size stage^c, fruit size up to 10% stage^c

fruit initiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025503

The fruit initiation stage may begin without fertilization or formation of a plant zygote (PO:0000423) in cases of parthenocarpy, apomixis, or other hormone-induced conditions. This stage ends as soon as plant cells (PO:0009002) in a developing fruit begin to divide or expand and may be very brief. This stage is to be used for an individual fruit. For the development stage of a whole plant (PO:0000003), use whole plant fruit formation stage up to 10% (PO:0007032).

has super-classes: fruit formation stage^c

fruit locule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025270

has super-classes: b f o 0000004; locule^c; develops_from^op some plant ovary locule^c; part_of^op some fruit^c

fruit nucellus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008005

is equivalent to: nucellus^c and (part_of^op some fruit^c)
has super-classes: nucellus^c; part_of^op some fruit^c

fruit operculum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025298

Develops from the apical portion of a gynoecium, and is commonly found as part of the fruit of species of Myrtaceae, such as Eucalyptus spp. If you are annotating to this term, please add an additional annotation to the specific type of fruit (PO:0009001), such as achene fruit (PO:0030107), berry fruit (PO:0030108), capsule fruit (PO:0030091), caryopsis fruit (PO:0030104), drupe fruit (PO:0030103), follicle fruit (PO:0030105), legume fruit (PO:0030100), nut fruit (PO:0030102), samara fruit (PO:0030099), schizocarp fruit (PO:0030098), silique fruit (PO:0030106), or their subclasses, depending on the species.

has super-classes: collective organ part structure^c; part_of^op some fruit^c
is disjoint with: spore capsule operculum^c

fruit pedicel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030114

has super-classes: pedicel^c
has sub-classes: infructescence fruit pedicel^c

fruit pedicel abscission zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025605

has super-classes: b f o 0000004; abscission zone^c; part_of^op some infructescence fruit pedicel^c; develops_from^op some flower pedicel abscission zone^c

fruit placenta^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004535

has super-classes: b f o 0000004; plant ovary placenta^c; part_of^op some fruit^c; develops_from^op some placenta^c
has sub-classes: fruit replum^c

fruit proximal end^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008002

has super-classes: cardinal part of multi-tissue plant structure^c; part_of^op some fruit^c

fruit replum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025267

A fruit replum develops from the ovary replum and has no suture line in its center, while a fruit septum (PO:0025262) develops from an ovary septum via the fusion of two adjacent ovary walls. Common in Brassicaceae. Annotations for Arabidopsis fruit should go here, and not under fruit septum. If you are annotating to this term, please add an additional annotation to the specific type of fruit (PO:0009001), such as achene fruit (PO:0030107), berry fruit (PO:0030108), capsule fruit (PO:0030091), caryopsis fruit (PO:0030104), drupe fruit (PO:0030103), follicle fruit (PO:0030105), legume fruit (PO:0030100), nut fruit (PO:0030102), samara fruit (PO:0030099), schizocarp fruit (PO:0030098), silique fruit (PO:0030106), or their subclasses, depending on the species.

has super-classes: fruit placenta^c; develops_from^op some plant ovary replum^c

fruit ripening stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025502

Succeeds a fruit formation stage (PO:0025501). This stage is to be used for an individual fruit. Fruit ripening (GO:0009835) is defined as: an aging process that has as participant a fruit. Ripening causes changes in one or more characteristics of a fruit (color, aroma, flavor, texture, hardness, cell wall structure) and may make it more attractive to animals and aid in seed dispersal. For the development stage of a whole plant (PO:0000003), use whole plant fruit ripening stage (PO:0007010).

has super-classes: fruit development stage^c

fruit septum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025268

Annotations for Arabidopsis should go under fruit replum (PO:0025267), not under fruit septum. The partition between two fruit locules of an orange is a fruit septum. If you are annotating to this term, please add an additional annotation to the specific type of fruit (PO:0009001), such as achene fruit (PO:0030107), berry fruit (PO:0030108), capsule fruit (PO:0030091), caryopsis fruit (PO:0030104), drupe fruit (PO:0030103), follicle fruit (PO:0030105), legume fruit (PO:0030100), nut fruit (PO:0030102), samara fruit (PO:0030099), schizocarp fruit (PO:0030098), silique fruit (PO:0030106), or their subclasses, depending on the species.

has super-classes: b f o 0000004; septum^c; part_of^op some fruit^c; develops_from^op some plant ovary septum^c

fruit size 10 to 30% stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025505

Succeeds a fruit size up to 10% stage (PO:0025504) and proceeds a fruit size 30 to 50% stage (PO:0025506). This term can only be used if the final size of the fruit is known. This stage is to be used for an individual fruit. For the development stage of a whole plant (PO:0000003), use whole plant fruit formation stage 10 to 30% (PO:0007009).

has super-classes: fruit formation stage^c

fruit size 30 to 50% stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025506

Succeeds a fruit size 10 to 30% stage (PO:0025505) and proceeds a fruit size 50 to 70% stage (PO:0025507). This term can only be used if the final size of the fruit is known. This stage is to be used for an individual fruit. For the development stage of a whole plant (PO:0000003), use whole plant fruit formation stage 30 to 50% (PO:0007029).

has super-classes: fruit formation stage^c

fruit size 50 to 70% stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025507

Succeeds a fruit size 30 to 50% stage (PO:0025505) and proceeds a fruit size 70% to final size stage (PO:0025508). This term can only be used if the final size of the fruit is known. This stage is to be used for an individual fruit. For the development stage of a whole plant (PO:0000003), use whole plant fruit formation stage 50 to 70% (PO:0007007).

has super-classes: fruit formation stage^c

fruit size 70% to final size stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025508

Succeeds a fruit size 50 to 70% stage (PO:0025507) and proceeds a fruit ripening stage. This term can only be used if the final size of the fruit is known. This stage is to be used for an individual fruit. For the development stage of a whole plant (PO:0000003), use whole plant fruit formation stage 70% to final size (PO:0007027).

has super-classes: fruit formation stage^c

fruit size up to 10% stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025504

Succeeds a fruit initiation stage (PO:0025503) and proceeds a fruit size 10 to 30% stage (PO:0025505). This term can only be used if the final size of the fruit is known. This stage is to be used for an individual fruit. For the development stage of a whole plant (PO:0000003), use whole plant fruit formation stage up to 10% (PO:0007032).

has super-classes: fruit formation stage^c

fruit storage parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025037

has super-classes: storage parenchyma^c; part_of^op some fruit^c

fruit valve^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000033

A valve may develop from an entire carpel (as in Brassicaceae) or from part of a carpel (as in Fabaceae). If you are annotating to this term, please add an additional annotation to the specific type of fruit (PO:0009001), such as achene fruit (PO:0030107), berry fruit (PO:0030108), capsule fruit (PO:0030091), caryopsis fruit (PO:0030104), drupe fruit (PO:0030103), follicle fruit (PO:0030105), legume fruit (PO:0030100), nut fruit (PO:0030102), samara fruit (PO:0030099), schizocarp fruit (PO:0030098), silique fruit (PO:0030106), or their subclasses, depending on the species.

has super-classes: valve^c; part_of^op some fruit^c

fruit vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008003

has super-classes: vascular system^c; part_of^op some fruit^c

fully expanded lemma stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001057

has super-classes: lemma development stage^c

fully expanded lodicule stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001079

has super-classes: lodicule development stage^c

fully expanded palea stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001071

has super-classes: palea development stage^c

fully expanded petal stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007612

has super-classes: corolla development stage^c

fully expanded sepal stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001045

has super-classes: calyx development stage^c

functional megaspore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000244

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: megaspore^c

functional specialization of the endosperm stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001042

has super-classes: endosperm development stage^c
has sub-classes: formation of aleurone and starchy layers stage^c

funicle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020006

If you are annotating to this structure for an angiosperm, please add an additional annotation to plant ovary ovule (PO:0025490). If you are annotating to this structure for an gymnosperm, please add an additional annotation to ovuliferous scale ovule (PO:0025491). If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: stalk^c; part_of^op some plant ovule^c

fused calyx^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025582

has super-classes: calyx^c
has sub-classes: calyptra calyx^c

fused collective tepal structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025138

has super-classes: collective tepal structure^c

fused corolla^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025581

has super-classes: corolla^c
has sub-classes: calyptra corolla^c

fused perianth^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025580

The petals (PO:0009032), sepals (PO:0009031) and tepals (PO:0009033) may be fused anywhere along the phyllome margin (PO:0025018). In some cases where the calyx (PO:0009060) and corolla (PO:0009060) are fused at the base it is referred to as a perianth tube.

has super-classes: perianth^c

fused petal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025583

In fused perianth (PO:0025580), the fused petal (PO:0025583) may be joined to a fused sepal (PO:002569) or another fused petal.

has super-classes: petal^c; part_of^op some fused corolla^c; part_of^op some fused perianth^c

fused sepal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025584

has super-classes: sepal^c

fused tepal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025137

has super-classes: tepal^c; part_of^op some fused collective tepal structure^c
is disjoint with: free tepal^c

fusiform initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000079

has super-classes: cambial initial cell^c

G anther dehiscence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001035

has super-classes: anther development stage^c

G early unicellular microspore stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001012

has super-classes: pollen development stage^c

G eight nucleate megagametophyte stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007629

Some plants do not form an eight nucleate megametophyte.

has super-classes: megagametophyte development stage^c

gametophore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030018

A gametophore is the leafy part of the gametophyte of mosses and leafy liverworts, excluding the protonema. Develop from buds that form on the protonema. Antheridia and archegonia arise on the gametophore.

has super-classes: b f o 0000004; shoot system^c; participates_in^op some gametophyte development stage^c; develops_from^op some gametophore bud^c

gametophore axillary hair^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030060

Found in pleurocarpous mosses. Form in the axils of leaf primordia and may disappear when the gametophore is mature.

has super-classes: axillary hair^c; part_of^op some gametophore^c

gametophore axillary hair basal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030064

has super-classes: axillary hair basal cell^c; part_of^op some gametophore axillary hair base^c

gametophore axillary hair base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030063

Consists of two to a dozen cells.

has super-classes: axillary hair base^c; part_of^op some gametophore axillary hair^c

gametophore axillary hair terminal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030062

has super-classes: axillary hair terminal cell^c; part_of^op some gametophore axillary hair^c

gametophore axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030020

Found in mosses and leafy liverworts. A stem or branch of the leafy part of a bryophyte.

is equivalent to: shoot axis^c and (part_of^op some gametophore^c)
has super-classes: shoot axis^c; part_of^op some gametophore^c
has sub-classes: gametophore branch^c, gametophore stem^c, pseudopodium^c

gametophore axis meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030023

Occurs at the tips of the stems and branches of bryophytes.

has super-classes: shoot axis meristematic apical cell^c; gametophore meristematic apical cell^c; part_of^op some gametophore axis^c

gametophore branch^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030021

A branch of the leafy part of a bryophyte shoot system.

has super-classes: branch^c; gametophore axis^c

gametophore bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030026

Occurs in mosses and leafy liverworts. Develops from a caulonema cell in mosses.

has super-classes: b f o 0000004; vegetative bud^c; develops_from^op some gametophore bud initial cell^c; participates_in^op some gametophyte development stage^c

gametophore bud initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030083

In Physcomitrella patens, a gametophore bud initial typically is more bulbous than a protonema side branch initial, and its plane of first cell division is oblique, rather than perpendicular, to the plane of growth.

has super-classes: protonema sub-apical initial cell^c

gametophore meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030019

Occurs in the non-vascular shoot system of the gametophyte of mosses and leafy liverworts.

is equivalent to: shoot meristematic apical cell^c and (part_of^op some gametophore^c)
has super-classes: shoot meristematic apical cell^c; part_of^op some gametophore^c
has sub-classes: gametophore axis meristematic apical cell^c, non-vascular leaf meristematic apical cell^c

gametophore reproductive whole plant development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025344

has super-classes: gametophyte reproductive stage^c

gametophore stem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030022

A stem (the primary axis) of the leafy part of a bryophyte shoot system.

has super-classes: stem^c; gametophore axis^c

gametophore vegetative whole plant development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025345

Succeeds a protonema stage.

has super-classes: gametophyte vegetative stage^c

gametophyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009004

Replace_by whole plant in the gametophyte phase (PO:0028002). The gametophyte arises from the product of meiosis (the spore). Structures that occur only in gametophytes should have a participates_in relation to the gametophyte phase.

gametophyte coma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0028005

In the moss genus Sphagnum, the gametophore coma is always composed of gametophore branches, but in all other mosses, it is composed of non-vascular leaves.

has super-classes: collective plant organ structure^c; part_of^op some gametophore^c

gametophyte development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0028003

In bryophytes and pteridophytes, a gametophytic phase may begin without meiosis by apospory. This usually occurs when damage to a plant in the sporophytic phase leads directly to the growth of a plant that is in the gametophyte development stage but bears the chromosome complement that would normally be found in the sporophyte development stage (PO:0028002). A whole plant in the gametophyte development stage usually has half the chromosome complement of a plant in the sporophyte development stage, but not in the case of apospory. A whole plant in the gametophyte development stage may cease to exist by death at any point in its development. In seed plants, the whole plant in the gametophyte development stage may cease to exists through transformation, such as when pollen (PO:0025281) releases its pollen sperm cells (PO:0025121) or when a plant embryo (PO:0009009) begins to develop within an embryo sac (PO:0025074) of an angiosperm. During the gametophytic phase, a plant may produce gametes (PO:0025006) by mitosis.

has super-classes: whole plant development stage^c; part_of^op some life of whole plant stage^c
has sub-classes: gametophyte dormant stage^c, gametophyte reproductive stage^c, gametophyte senescent stage^c, gametophyte vegetative stage^c, megagametophyte development stage^c, microgametophyte development stage^c, plant spore stage^c

gametophyte dormant stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025342

A dormancy process (GO:0022611) is a developmental process in which dormancy (sometimes called a dormant state) is induced, maintained or broken. Dormancy is a suspension of most physiological activity and growth that can be reactivated. This term only applies to a whole plant (PO:0000003) in the gametophyte stage, not to the dormant stage of other plant structures. The dormant stage may be a response to environmental conditions such as seasonality or extreme heat, drought, or cold. Examples of a gametophyte dormant stage are the moss Polytrichum commune after it has undergone dessication (a type of resurrection plant), the boreal moss Polytrichum alpestre, whose shoot systems have annual growth segments due to a period of dormancy during the winter, the female gametophyte of Ginkgo biloba, which is dormant before fertilization, and dormancy of plant spores.

has super-classes: gametophyte development stage^c
has sub-classes: plant spore dormant stage^c

gametophyte meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030014

Occurs bryophytes and pteridophytes.

is equivalent to: meristematic apical cell^c and (participates_in^op some gametophyte development stage^c)
has super-classes: b f o 0000002; meristematic apical cell^c; participates_in^op some gametophyte development stage^c
has sub-classes: protonema meristematic apical cell^c, rhizoid meristematic apical cell^c, thallus meristematic apical cell^c

gametophyte perianth^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030031

The perichaetal bracts may fuse laterally in the gametophytic perianth. The gametophytic perianth is not the same structure as a perianth (PO:0009058) in angiosperms.

has super-classes: c a r o 0000000; collective phyllome structure^c; part_of^op some gametophore^c; has_part^op some perichaetal bract^c
is disjoint with: perianth^c

gametophyte reproductive stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025341

A whole plant (PO:0000003) may continue developmental vegetative growth (GO:0080186) after it has entered the reproductive stage, and it may revert to a stage in which it is no longer producing gametantia, but once it has initiated a single gametangium, it remains in the reproductive stage until senescence or death by some other cause.

has super-classes: gametophyte development stage^c
has sub-classes: gametophore reproductive whole plant development stage^c, thallus reproductive whole plant development stage^c

gametophyte senescent stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025343

The gametophyte senescent stage is often preceded by the gametophyte reproductive stage, and it ends with death of the gametophyte, either as a result of senescence or some other cause. This stage is distinct from gametophyte dormant stage, in which organs may senesce, but some parts of the plant remain alive. Multicellular organism senescence/aging (GO:0010259) includes loss of functions such as resistance to disease, homeostasis, and fertility, as well processes like cellular senescence, organ senescence, and wear and tear. The POC curators have requested to the GOC that they revise the definition of GO:0010259, to make it more appropriate for plants.

has super-classes: gametophyte development stage^c

gametophyte vegetative stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025340

A gametophyte may begin to senesce or die from other causes before producing gametangia. Some plants, such as the fern Vittaria appalachiana, may never produce gametangia, and remain in the vegetative stage indefinitely. Developmental vegetative growth (GO:0080186) can also occur during the reproductive stage.

has super-classes: gametophyte development stage^c
has sub-classes: gametophore vegetative whole plant development stage^c, protonema whole plant development stage^c, thallus vegetative whole plant development stage^c

gelatinous fiber cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025422

Often found in reaction wood in dicots and in some phloem fiber cells (PO:0004519), as in Linum usitatissimum. In gelatinous fiber cells, the inner layer of the cell wall is a cellulosic gelatinous-layer or G-layer, which may be relatively porous and less compact than the outer layers of the cell wall and may absorb water and swell.

has super-classes: xylem fiber cell^c

gemma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025614

has super-classes: portion of plant tissue^c

generative cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020097

Occurs in angiosperms.

has super-classes: spermatogenous cell^c

germination pore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020018

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043677.

glandular trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004509

has super-classes: trichome^c
has sub-classes: lupulin gland^c

glume^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009039

Found in Poaceae and Cyperaceae. Glumes subtend the pair of florets while a lemma or palea subtend the individual florets.

has super-classes: inflorescence bract^c; part_of^op some spikelet^c
has sub-classes: glume of ear spikelet^c, glume of tassel spikelet^c, lower glume^c, upper glume^c

glume awn^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025351

has super-classes: awn^c; part_of^op some glume^c

glume of ear spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006367

is equivalent to: glume^c and (part_of^op some ear spikelet^c)
has super-classes: glume^c; part_of^op some ear spikelet^c
has sub-classes: lower glume of ear spikelet^c, upper glume of ear spikelet^c

glume of tassel spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006368

is equivalent to: glume^c and (part_of^op some tassel spikelet^c)
has super-classes: glume^c; part_of^op some tassel spikelet^c
has sub-classes: lower glume of tassel spikelet^c, upper glume of tassel spikelet^c

ground meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025594

has super-classes: portion of meristem tissue^c
has sub-classes: root system ground meristem^c, shoot system ground meristem^c

ground tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009016

Replaced by portion of ground tissue (). Uninformative definition. Check it again.

ground tissue cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025030

Includes parenchyma, collenchyma and sclerenchyma cells.

has super-classes: native plant cell^c; part_of^op some portion of ground tissue^c
has sub-classes: bundle sheath cell^c, collenchyma cell^c, columella root cap cell^c, laticifer cell^c, myrosin cell^c, parenchyma cell^c, passage cell^c, pericycle cell^c, root giant cell^c, root syncytium cell^c, sclerenchyma cell^c, stereid^c, transfer cell^c

growth ring^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004514

Appears as a ring in a transverse section of plant axis (PO:0025004). May be an annual ring (one growth ring per year) or a false annual ring (more or less than one growth ring per year).

has super-classes: secondary xylem^c

growth ring boundary^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004517

Used to describe the boundary area between two adjacent growth rings, which may be distinct or indistinct.

has super-classes: secondary xylem^c

guard cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000293

They cause the opening and closing of the pore by changes in turgor.

has super-classes: b f o 0000004; shoot epidermal cell^c; develops_from^op some guard mother cell^c; part_of^op some stomatal complex^c
has sub-classes: phyllome guard cell^c
is disjoint with: epidermal pavement cell^c

guard mother cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000351

has super-classes: b f o 0000004; shoot epidermal cell^c; develops_from^op some stomatal initial cell^c

gynoecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009062

If annotating gene expression to a gynoecium with a single carpel (PO:0009030), the annotation should go on carpel. A gynoecium with two or more carpels may be either syncarpous (carpels fused) or apopcarpous (carpels free) or the carpels may be partially fused. The word pistil is used synonymously with gynoecium for a synocarpous gynoecium, and synonymously with carpel for an apocarpous gynoecium, whether it has one or more carpels. In Zea mays, gynoecia of tassel florets and of the lower florets of ear spikelets usually do not develop fully, and they are present in a rudimentary state. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), lower floret of pedicellate spikelet of ear (PO:0006353), lower floret of sessile spikelet of ear (PO:0006351), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: b f o 0000004; collective phyllome structure^c; develops_from^op some gynoecium primordium^c; part_of^op some flower^c
has sub-classes: gynoecium ridge^c, pistillode^c

gynoecium development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007606

has super-classes: collective phyllome structure development stage^c; part_of^op some floral organ differentiation stage^c
has sub-classes: carpel primordium visible stage^c, closure of carpel(s) stage^c, gynoecium differentiation and expansion stage^c, ovule development stage^c, stigma cell differentiation stage^c

gynoecium differentiation and expansion stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004501

has super-classes: gynoecium development stage^c

gynoecium primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000019

Use carpel primordium (PO:0004703) for the primordium (PO:0025127) of an individual carpel (PO:0009030).

has super-classes: floral organ primordium^c

gynoecium ridge^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025088

Common in monocots, including species of Poaceae such as Zea mays. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), lower floret of pedicellate spikelet of ear (PO:0006353), lower floret of sessile spikelet of ear (PO:0006351), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352). In Zea mays, development of the gynoecium ridge of the upper floret of pedicellate spikelet of ear occurs via continued overgrowth of the shoot apex (which becomes the ovule primordium) by a ring of gynoecial tissue, leading to the formation of a stylar canal that is detected as a slight protuberance on the mature ovary. Early development of the gynoecium ridge of the lower floret of pedicellate spikelet of ear is very similar to that of the upper floret of the pedicellate spikelet of ear, except the development does not proceed beyond the early ridge stage.

has super-classes: gynoecium^c

gynophore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006330

A gynophore is only present when there is an elongation of the axis between the androecium and gynoecium.

has super-classes: shoot axis^c; floral organ^c

H anther senescence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001036

has super-classes: anther development stage^c

H late unicellular microspore stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001013

has super-classes: pollen development stage^c

haustorial root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003004

Term is specific for parasitic plants only.

heartwood^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004512

Heartwood has ceased to function in storage and conduction, and the reserve materials have been removed or converted into heartwood substances. It is generally darker colored than sapwood (PO:0004513) and is found in the center of a shoot axis (PO:0025029) or root (PO:0009005), interior to the sapwood. Heartwood forms at the end of a cell death stage of secondary xylem (PO:0025466).

has super-classes: secondary xylem^c; part_of^op some plant axis^c

helobial endosperm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006017

has super-classes: endosperm^c

hesperidium fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030109

A hesperidium fruit (PO:0030109) develops from a superior gynoecium (PO:0009062), and therefore is not surrounded by receptacle (PO:0009064) tissue. Examples: orange, grapefruit, lemon, and lime (Citrus spp.).

has super-classes: berry fruit^c

higher order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009081

A higher order inflorescence axis is any inflorescence axis (PO:0020122) that develops from another inflorescence axis (PO:0020122), and is named according to its position in an inflorescence (PO:0009049). Tenth order inflorescence axis (PO:0025111) is the greatest specific inflorescence axis order in the PO; when mapping annotations to inflorescence axes which are of an order greater than ten, or when order is ambiguous or unknown, annotate directly to higher order inflorescence axis.

has super-classes: inflorescence axis^c
has sub-classes: eighth order inflorescence axis^c, fifth order inflorescence axis^c, fourth order inflorescence axis^c, ninth order inflorescence axis^c, second order inflorescence axis^c, seventh order inflorescence axis^c, sixth order inflorescence axis^c, spikelet pedicel^c, spikelet rachilla^c, tassel inflorescence branch^c, tenth order inflorescence axis^c, third order inflorescence axis^c

higher order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025243

A higher order infructescence axis is named according to its position in an infructescence (PO:0006342). Tenth order infructescence axis (PO:0025112) is the greatest specific infructescence axis (PO:0025242) order in the PO; when mapping annotations to an infructescence axis which is of an order higher than ten, or when order is ambiguous or unknown, annotate directly to higher order infructescence axis (PO:0025243).

has super-classes: infructescence axis^c
has sub-classes: eighth order infructescence axis^c, fifth order infructescence axis^c, fourth order infructescence axis^c, ninth order infructescence axis^c, second order infructescence axis^c, seventh order infructescence axis^c, sixth order infructescence axis^c, tenth order infructescence axis^c, third order infructescence axis^c

higher order leaf vein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008023

Vein orders only apply to hierarchically branching vein patterns, not to dichotomously branching vein patterns, as found in some ferns and gymnosperms.

has super-classes: leaf lamina vein^c

hilum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020063

has super-classes: cardinal part of multi-tissue plant structure^c; part_of^op some seed^c

hilum groove^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004719

has super-classes: canal^c; part_of^op some seed^c

hood-shaped primordium stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001020

has super-classes: vascular leaf expansion stage^c

hydathode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005660

Hydathodes may have one or more pores that are similar to stomata but lack the ability to open and close. Hydathodes are involved in the release of water or xylem sap through pores via guttation or secretion. Generally, hydathodes are located at the end of a minor vein in a phyllome. In many plants, hydathodes includes a portion of thin-walled parenchyma between the tracheary elements and the pore, known as an epithem. In some plants, hydathodes are associated with secretory tissue.

has super-classes: cardinal organ part^c

hydathode pore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025322

Similar to a stomatal pore, but lacks the ability to open and close. Involved in the release water or xylem sap through guttation or secretion.

has super-classes: plant anatomical space^c; part_of^op some hydathode^c

hydroid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025032

Hydroids are water and mineral conducting cells found in bryophytes in axes and leaves in the gametophytic phase and in the seta in the sporophytic phase.

has super-classes: native plant cell^c; part_of^op some hydrome^c
is disjoint with: tracheary element^c

hydrome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030047

A hydrome is composed of only hydroids. Found in bryophytes, in the center of a non-vascular shoot axis (PO:0025029) such as a gametophore (PO:0030018) or seta (PO:0030032). Often surrounded by the leptome (PO:0030048). May function in water conduction and may provide support.

has super-classes: portion of plant tissue^c
is disjoint with: xylem^c

hypanthium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009065

Only bears stamens or perianth segments if they are present in the flower (e.g., no stamens in a carpellate flower).

has super-classes: cardinal organ part^c; part_of^op some receptacle^c

hyperphyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020044

has super-classes: cardinal organ part^c; part_of^op some cotyledon^c

hypocotyl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020100

has super-classes: stem internode^c
has sub-classes: embryo hypocotyl^c, seedling hypocotyl^c

hypocotyl emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007043

This term is used only for seed plants. The actual point of emergence from the seed coat (PO:0009088) may not be observed if the seed (PO:0009010) is underneath a growth medium. In a fruit (PO:0009001) with a persistent pericarp (PO:0009084), emergence from the seed coat may not be observed.

has super-classes: seedling development stage^c

hypocotyl endodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006065

has super-classes: endodermis^c; part_of^op some hypocotyl^c

hypocotyl epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005013

has super-classes: stem epidermis^c; part_of^op some hypocotyl^c

hypocotyl vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008015

has super-classes: vascular system^c; portion of embryo plant tissue^c; part_of^op some hypocotyl^c; part_of^op some plant embryo vascular system^c

hypocotyl-root junction^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004724

has super-classes: cardinal organ part^c
has sub-classes: embryo hypocotyl-root junction^c, seedling hypocotyl-root junction^c

hypodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005051

A layer or layers of cells beneath the epidermis that is distinct in appearance from adjacent tissues.

has super-classes: portion of ground tissue^c; part_of^op some cortex^c
has sub-classes: exodermis^c, shoot axis hypodermis^c

I first mitotic division stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001014

has super-classes: pollen development stage^c

idioblast^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000283

Often contains deposit of minerals or products of secondary metabolism. May have a specialized function.

has super-classes: native plant cell^c

IE.00 inflorescence tip just visible above flag leaf sheath stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007025

has super-classes: inflorescence emergence stage^c

IE.01 1/4 of inflorescence emerged from flag leaf sheath stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007048

has super-classes: inflorescence emergence stage^c

IE.02 1/2 of inflorescence emerged from flag leaf sheath stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007008

has super-classes: inflorescence emergence stage^c

IE.03 3/4 of inflorescence emerged from flag leaf sheath stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007002

has super-classes: inflorescence emergence stage^c

IE.04 inflorescence fully emerged from flag leaf sheath stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007023

has super-classes: inflorescence emergence stage^c

IL.00 inflorescence just visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007006

Includes the time when the inflorescence can be seen by removing outer leaves or bracts, or when the inflorescence is visible as a swelling of the outer leaves or bracts, such as booting in Zea. This phase can only be used if the final length of the inflorescence is known.

has super-classes: whole plant inflorescence detectable stage^c
has sub-classes: booting stage^c

IL.01 1/4 inflorescence length reached stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007046

This phase can only be used if the final length of the inflorescence is known.

has super-classes: whole plant inflorescence detectable stage^c

IL.02 1/2 inflorescence length reached stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007005

This phase can only be used if the final length of the inflorescence is known.

has super-classes: whole plant inflorescence detectable stage^c

IL.03 full inflorescence length reached stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007003

This phase can only be used if the final length of the inflorescence is known.

has super-classes: whole plant inflorescence detectable stage^c

in vitro plant structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000004

In vitro growth is defined as microbe-free growth in a sterile, culture environment, usually in the laboratory. An example of a sterile culture environment is growth on or in a nutrient medium in a Petri dish, culture flask or test tube. Microbes may be intentionally added to the culture environment, such as in co-culture with Agrobacterium.

has super-classes: plant structure^c
has sub-classes: cultured plant callus^c, cultured plant cell^c, cultured plant embryo^c

included phloem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004524

has super-classes: secondary phloem^c

included vascular cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004523

has super-classes: vascular cambium^c

indehiscent fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020065

indeterminate nodule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004538

Nodule is persistent and may continue to grow after a physiological stress.

has super-classes: root nodule^c

indeterminate thyrse inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030127

The higher order inflorescence axes (PO:0009081) of an indeterminate thyrse inflorescence may have either a monopodial or sympodial growth habit depending on whether single or paired inflorescence axillary meristems (PO:0009105) develop at each axis. Examples include beardtongues (Penstemon spp.; Plantaginaceae).

has super-classes: inflorescence^c

inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009049

An inflorescence is a reproductive shoot system from which at least two flowers develop. The growth pattern of an inflorescence may be monopodial (single main shoot axis), sympodial (growth only occurs from axillary meristems), or both. An inflorescence axis (PO:0020122) can be determinate or indeterminate. An inflorescence flower pedicel (PO:0009052) is the ultimate axis in an inflorescence. The flower (PO:0009046) of many plants, for example Magnolia spp., is solitary.

has super-classes: c a r o 0000000; reproductive shoot system^c; participates_in^op some inflorescence development stage^c; has_part^op some flower^c
has sub-classes: anthela inflorescence^c, bostryx inflorescence^c, capitulum inflorescence^c, catkin inflorescence^c, cincinnus inflorescence^c, compound capitulum inflorescence^c, compound cincinnus inflorescence^c, compound drepanium inflorescence^c, compound raceme inflorescence^c, compound spike inflorescence^c, compound umbel inflorescence^c, corymb inflorescence^c, cyme inflorescence^c, determinate thyrse inflorescence^c, drepanium inflorescence^c, indeterminate thyrse inflorescence^c, panicle inflorescence^c, pistillate inflorescence^c, raceme inflorescence^c, rhipidium inflorescence^c, spadix inflorescence^c, spike inflorescence^c, staminate inflorescence^c, umbel inflorescence^c

inflorescence apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009108

has super-classes: b f o 0000004; inflorescence meristem^c; reproductive shoot apical meristem^c; develops_from^op some vegetative shoot apical meristem^c
has sub-classes: ear apical meristem^c, spikelet meristem^c, tassel apical meristem^c

inflorescence axillary meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009105

has super-classes: inflorescence meristem^c
has sub-classes: ear inflorescence axillary meristem^c, tassel inflorescence axillary meristem^c

inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020122

An inflorescence axis (PO:0020122) has either a determinate apex, which terminates in a flower meristem (PO:0000229), or has an indeterminate apex, which terminates in an inflorescence apical meristem (PO:0009108). An inflorescence pedicel (PO:0009052) is the simplest example of a determinate inflorescence axis.

has super-classes: shoot axis^c; part_of^op some inflorescence^c
has sub-classes: first order inflorescence axis^c, higher order inflorescence axis^c

inflorescence axis internode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006326

has super-classes: shoot axis internode^c; part_of^op some inflorescence axis^c

inflorescence axis node^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006325

has super-classes: shoot axis node^c; part_of^op some inflorescence axis^c

inflorescence bifurcation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007037

has super-classes: inflorescence development stage^c

inflorescence bract^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009054

Includes the leaf subtending and acting as outer envelope of an ear in Zea mays.

has super-classes: bract^c; develops_from^op some inflorescence bract primordium^c; part_of^op some inflorescence^c
has sub-classes: glume^c, involucral bract^c

inflorescence bract primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025489

has super-classes: bract primordium^c

inflorescence branch crown^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025134

has super-classes: shoot system^c; part_of^op some inflorescence^c

inflorescence branch pulvinus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009017

has super-classes: pulvinus^c; part_of^op some higher order inflorescence axis^c

inflorescence bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000057

has super-classes: reproductive bud^c
has sub-classes: axillary inflorescence bud^c, terminal inflorescence bud^c

inflorescence development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001083

has super-classes: reproductive shoot system development stage^c
has sub-classes: inflorescence bifurcation stage^c, inflorescence initiation stage^c

inflorescence emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007041

Includes emergence of a Zea mays inflorescence from a flag leaf sheath, following booting. In US cornbelt maize (including B73) the tassel fully emerges about 2-3 days prior to silk emergence from husk leaves. At this time the ear and husk may still be enclosed within its leaf sheath depending on the variety and environmental conditions.

has super-classes: whole plant inflorescence detectable stage^c
has sub-classes: IE.00 inflorescence tip just visible above flag leaf sheath stage^c, IE.01 1/4 of inflorescence emerged from flag leaf sheath stage^c, IE.02 1/2 of inflorescence emerged from flag leaf sheath stage^c, IE.03 3/4 of inflorescence emerged from flag leaf sheath stage^c, IE.04 inflorescence fully emerged from flag leaf sheath stage^c

inflorescence flower pedicel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009052

An inflorescence flower pedicel is the ultimate shoot axis (PO:0025029) in an inflorescence (PO:0009049).

has super-classes: flower pedicel^c; part_of^op some inflorescence^c

inflorescence initiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0021004

has super-classes: inflorescence development stage^c

inflorescence meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000230

has super-classes: portion of meristem tissue^c; part_of^op some inflorescence^c
has sub-classes: ear meristem^c, inflorescence apical meristem^c, inflorescence axillary meristem^c, tassel meristem^c

inflorescence vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005028

has super-classes: shoot system vascular system^c; part_of^op some inflorescence^c

infructescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006342

has super-classes: c a r o 0000000; reproductive shoot system^c; develops_from^op some inflorescence^c; has_part^op some fruit^c
has sub-classes: ear infructescence^c

infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025242

has super-classes: b f o 0000004; shoot axis^c; develops_from^op some inflorescence axis^c; part_of^op some infructescence^c
has sub-classes: first order infructescence axis^c, higher order infructescence axis^c

infructescence fruit pedicel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004536

An infructescence fruit pedicel is the ultimate shoot axis (PO:0025029) in an infructescence (PO:0006342).

has super-classes: b f o 0000004; fruit pedicel^c; develops_from^op some inflorescence flower pedicel^c; part_of^op some infructescence^c

initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004011

Initial cells are often part of a portion of tissue that is composed mostly of somewhat older, differentiating cells. The division of an initial cell is often uneven, with the smaller daughter cell remaining meristematic.

has super-classes: meristematic cell^c
has sub-classes: archegonium initial cell^c, cambial initial cell^c, epidermal initial cell^c, non-vascular leaf initial cell^c, protonema sub-apical initial cell^c, root initial cell^c

inner integument^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020022

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: integument^c

inner integument epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006044

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: integument epidermis^c; part_of^op some inner integument^c

integument^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020021

has super-classes: portion of plant tissue^c; part_of^op some plant ovule^c
has sub-classes: inner integument^c, outer integument^c

integument epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006043

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

is equivalent to: epidermis^c and (part_of^op some integument^c)
has super-classes: epidermis^c; part_of^op some integument^c
has sub-classes: inner integument epidermis^c, outer integument epidermis^c

integument initiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007622

has super-classes: ovule differentiation and expansion stage^c

intercalary meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006073

See subtypes: leaf intercalary meristem (PO:0006346) and stem intercalary meristem (PO:0006347). Not known to occur in roots. Term for primary growth has been requested in GO.

has super-classes: shoot system meristem^c
has sub-classes: leaf intercalary meristem^c, stem intercalary meristem^c

intercellular space^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025379

Often part of a mesophyll (PO:0006070). This term does not include spaces on the surface of a plant structure, like a stomatal pore (PO:0008032), stomium (PO:0020101), or micropyle (PO:0020025), nor larger cavities or canals that are surrounded by tissue, such as an archegonium neck canal (PO:0030066). May be filled with air or fluid.

has super-classes: plant anatomical space^c; part_of^op some portion of plant tissue^c
has sub-classes: leaf mesophyll intercellular space^c, substomatal cavity^c

intercuticular wax^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025389

The intercuticular wax is located adjacent to the cell wall.

has super-classes: cuticular wax^c; part_of^op some plant cuticle proper^c

interfascicular cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006201

Portions of interfascicular cambium may merge with fascicular cambium (PO:0006200) to form a cylinder of cambium or they may remain isolated. May develop from meristematic cells (PO:0004010) that have never differentiated into another cell type or from parenchyma cells (PO:0000074) that retain some meristematic ability.

has super-classes: vascular cambium^c

interfascicular region^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006202

Inapplicable for nearly all monocots.

has super-classes: portion of ground tissue^c; part_of^op some shoot axis^c
has sub-classes: tuber interfascicular region^c

intermediary companion cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025460

Intermediary companion cells translocate high concentrations of raffinose-family oligosaccharides and are found in plants that use symplastic phloem loading. Unlike sieve tube elements (PO:0000289), intermediary companion cells retain their nuclei and other organelles at maturity.

has super-classes: companion cell^c

internal phloem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006216

has super-classes: primary phloem^c

intine^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020017

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043678.

involucral bract^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009045

Involucre are found in plant families such as Asteraceae or Compositeae.

has super-classes: inflorescence bract^c; part_of^op some involucre^c

involucre^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009100

The burs or bristles in Cenchrus and Pennisetum are not involucres because the fused structures are branches and not bracts.

has super-classes: collective phyllome structure^c; part_of^op some inflorescence^c

J bicellular pollen stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001059

has super-classes: pollen development stage^c

juice sac tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006013

Juice sac tissue is found in citrus spp. (hesperidium fruit; PO:0030109), and develops from cells of the endocarp (PO:0009086).

has super-classes: portion of plant tissue^c; part_of^op some endocarp^c

juvenile vascular leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006339

Many species have juvenile leaves at the base of the stem, adult leaves at the apex, and transition leaves in between. In maize, juvenile leaves are at the tip of the stalk (stem), which differentiates first, with adult leaves at the base, while other grasses may have other arrangements. The first juvenile leaves in Poaceae are the embryonic leaves found in the grass kernel (caryopsis).

has super-classes: vascular leaf^c

K second mitotic division stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001015

In taxa with mature two-celled pollen (PO:0025281), the second mitotic division takes place after pollen germination (GO:0009846), in the germinating pollen tube cell (PO:0025195). Note: This term overlaps with the GO BP term: generative cell mitosis (GO:0055047): The process in which the generative cell divides by mitosis to form two haploid cells. These will subsequently differentiate into sperm cells.

has super-classes: pollen development stage^c

keel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025327

The two petals of the keel are often fused at the apex and free at the base. The keel projects toward the front of the flower. Found in the flowers of some Fabaceae.

has super-classes: collective phyllome structure^c; part_of^op some corolla^c

keel petal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025326

The keel petals are usually larger than the adjacent wing petals. They are often partially fused to each other. Each petal is shaped like half a boat and projects toward the front of the flower.

has super-classes: petal^c; part_of^op some keel^c

L mature pollen stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001016

Mature pollen stages is reached at three-celled pollen in some angiosperms (maize, rice and Arabidopsis), while in others, the maturepollen has two haploid cells (tobacco, snapdragon).

has super-classes: pollen development stage^c

L1^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006303

A similar term L1 meristem (PO:0009020) occurs.

L2^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006304

A similar term L2 meristem (PO:0009021) occurs.

L3^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006305

A similar term L3 meristem (PO:0009022) occurs.

lacunar collenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005632

The term was made obsolete because the lacunar form is an attribute of regular collenchyma.

lamellar collenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005633

The term was made obsolete because lamellar form is an attribute of regular collenchyma.

lamina^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025060

PATO:0000407 (flat) and PATO:0000592 (thin).

has super-classes: cardinal part of multi-tissue plant structure^c
has sub-classes: plant organ lamina^c

late rosette growth stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007076

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: rosette growth stage^c

late whole plant fruit ripening stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007050

has super-classes: whole plant fruit ripening stage^c

late wood^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004516

The transition from early wood to late wood may be gradual and is not always easy to distinguish.

has super-classes: secondary xylem^c; part_of^op some growth ring^c

late wood tracheary element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025462

Late wood tracheary elements generally have smaller cell lumens than early wood tracheary elements (PO:0025461) of the same growth ring (PO:0004514).

is equivalent to: secondary xylem tracheary element^c and (part_of^op some late wood^c)
has super-classes: secondary xylem tracheary element^c; part_of^op some late wood^c

lateral leaf vein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006011

Found in the leaf lamina of some monocots, particularly in Poaceae.

has super-classes: secondary leaf vein^c

lateral meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020145

A term for lateral growth has been requested in GO. Lateral meristems contribute to an increase in the cross-sectional area of a shoot axis or root. Examples of lateral meristems are: cambium (PO:0005597) (includes cork cambium (PO:0005599) and vascular cambium (PO:0005598)), shoot lateral meristem (PO:0006344) (includes primary thickening meristem (PO:0005039)), root lateral meristem (PO:0006308), and secondary thickening meristem (PO:0025414). Contrasts with apical meristem (PO:0020144), phyllome marginal meristem (PO:0025404), or intercalary meristem (PO:0006073).

has super-classes: portion of meristem tissue^c; part_of^op some plant axis^c
has sub-classes: cambium^c, root lateral meristem^c, secondary thickening meristem^c, shoot lateral meristem^c

lateral root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020121

A lateral root primordium may develops on any root, including a primary root (PO:0020127), on an existing lateral root (PO:0020121), or a shoot-borne root (PO:0000042). In seed plants, a lateral root primordium generally develops from pericycle cells (PO:0025261), but cells of an endodermis (PO:0000252) may also participate in its formation in some species. In ferns, lateral root primordia develop from the endodermis.

has super-classes: root^c; develops_from^op some lateral root primordium^c
has sub-classes: lateral root spine^c, non-pericyclic lateral root^c, pericyclic lateral root^c, pneumatophore^c, pneumatorhiza^c

lateral root apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006020

This is different from root lateral meristem.

has super-classes: root apical meristem^c; part_of^op some lateral root tip^c

lateral root cap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020131

This is the general term for the lateral portion of any root cap and not the term for a root cap of lateral root (PO:0003018) or lateral root cap of lateral root (PO:0003020).

has super-classes: root parenchyma^c; part_of^op some root cap^c
has sub-classes: lateral root cap of lateral root^c, lateral root cap of primary root^c

lateral root cap of lateral root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003020

has super-classes: lateral root cap^c; part_of^op some root cap of lateral root^c

lateral root cap of primary root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003022

has super-classes: lateral root cap^c; part_of^op some root cap of primary root^c

lateral root differentiation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003016

has super-classes: root differentiation zone^c; part_of^op some lateral root^c

lateral root elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025256

has super-classes: root elongation zone^c; part_of^op some lateral root tip^c

lateral root emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007517

Starch grains can be seen in the root cap after emergence.

has super-classes: root emergence stage^c

lateral root epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006209

lateral root primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000016

A lateral root primordium may arise from cells of a pericycle (PO:0006203) in a root, as in most seed plants (pericyclic lateral root primordium; PO:0025492), or from cells of an endodermis (PO:0000252) or other tissue in ferns and some seed plants (non-pericyclic lateral root primordium: PO:0025493). Transition from lateral root primordium to lateral root occurs with the formation of a root cap (PO:0020123), shortly after the development of a root apical meristem (PO:0020147), which can occur before the lateral root penetrates the exterior of the parent root.

has super-classes: root primordium^c; part_of^op some root^c
has sub-classes: non-pericyclic lateral root primordium^c, pericyclic lateral root primordium^c

lateral root primordium formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007511

has super-classes: 1 root primordium formation stage^c

lateral root spine^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030088

Lateral root spines cannot grow indeterminately or supply the plant with water and solutes. See JSTOR:43235457 for documentation of lateral root spines in Dioscorea prehensilis (Dioscoreaceae) and Moraea sp. (Iridaceae).

has super-classes: lateral root^c

lateral root tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000027

has super-classes: root tip^c; part_of^op some lateral root^c

lateral root-cap epidermal initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000061

has super-classes: root initial cell^c

laticifer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005053

This term was made obsolete because its had only one subclass. Consider non-articulated laticifer (PO:0005007), articulated laticifer cell (PO:0006221) or non-articulated laticifer cell (PO:0006222) instead.

laticifer cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025031

May be simple or branched.

has super-classes: ground tissue cell^c
has sub-classes: articulated laticifer cell^c, non-articulated laticifer cell^c

laticiferous cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004005

Obsoleted: Too general definition of the term. Replaced by laticifer cell (PO:0025031).

leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025034

has super-classes: phyllome^c
has sub-classes: non-vascular leaf^c, vascular leaf^c

leaf abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006019

Used to refer to an abaxial epidermis of an entire leaf. More specific terms exist for leaf lamina abaxial epidermis and petiole abaxial epidermis. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: leaf epidermis^c
has sub-classes: leaf lamina abaxial epidermis^c

leaf abaxial pavement cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025213

has super-classes: leaf pavement cell^c; part_of^op some leaf abaxial epidermis^c

leaf abaxial stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025190

has super-classes: leaf stomatal complex^c; part_of^op some leaf abaxial epidermis^c

leaf abaxial trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025210

has super-classes: leaf trichome^c; part_of^op some leaf abaxial epidermis^c

leaf abscission zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006501

has super-classes: abscission zone^c; part_of^op some vascular leaf^c

leaf adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006018

Used to refer to an adaxial epidermis of an entire leaf. More specific terms exist for leaf lamina adaxial epidermis and petiole adaxial epidermis. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: leaf epidermis^c
has sub-classes: leaf lamina adaxial epidermis^c

leaf adaxial pavement cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025214

has super-classes: leaf pavement cell^c; part_of^op some leaf adaxial epidermis^c

leaf adaxial stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025191

has super-classes: leaf stomatal complex^c; part_of^op some leaf adaxial epidermis^c

leaf adaxial trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025211

has super-classes: leaf trichome^c; part_of^op some leaf adaxial epidermis^c

leaf aerenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006215

has super-classes: aerenchyma^c; part_of^op some leaf^c

leaf apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020137

It is not precisely defined how far toward the base from the tip a leaf apex extends. For the apical most portion of a leaf, use the term leaf tip. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: phyllome apex^c; part_of^op some leaf^c
has sub-classes: leaf apex tendril^c

leaf apex tendril^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025363

Aids plant in climbing. Found at the apex of a leaf lamina, but the leaf apex tendril is not laminar or it may be a narrow lamina. If the tendril is derived from the terminal leaflet, use the term leaflet tendril (PO:0025362). See also leaf tendril (PO:0025361), leaflet tendril (PO:0025362), branch tendril (PO:0025364), stem apex tendril (PO:0025365), leaf rachis tendril (PO:0025366), and prophyll tendril (PO:0025367). Careful observation is required to correctly classify some tendrils.

has super-classes: leaf apex^c; part_of^op some vascular leaf^c

leaf axil^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009023

has super-classes: axil^c

leaf base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020040

has super-classes: phyllome base^c; part_of^op some leaf^c
has sub-classes: tubercle^c

leaf collar^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006012

has super-classes: portion of meristem tissue^c; part_of^op some vascular leaf^c

leaf development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001050

has super-classes: phyllome development stage^c
has sub-classes: non-vascular leaf development stage^c, vascular leaf development stage^c

leaf endodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005060

Often found in the leaf of Gymnosperms and elsewhere.

has super-classes: endodermis^c; part_of^op some vascular leaf^c

leaf epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006016

is equivalent to: phyllome epidermis^c and (part_of^op some leaf^c)
has super-classes: phyllome epidermis^c; part_of^op some leaf^c
has sub-classes: cotyledon epidermis^c, leaf abaxial epidermis^c, leaf adaxial epidermis^c, leaf lamina epidermis^c, leaf prickle^c, leaf sheath epidermis^c, leaf stomatal complex^c, petiole epidermis^c

leaf guard cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025237

has super-classes: phyllome guard cell^c; part_of^op some leaf stomatal complex^c

leaf intercalary meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006346

Results in an increase in length of a leaf, as part of primary growth. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf. The leaf intercalary meristem does not include a leaf plate meristem (PO:0025429) .

has super-classes: intercalary meristem^c; part_of^op some leaf^c

leaf lamina^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020039

A leaf lamina is usually dorsiventrally flattened, but may be flattened in a median plant (perpendicular to the axis) in the case of phyllodes (PO:0025335) or other ensiform leaves (PO:0025333). This term should not be used for leaves that are not laminar (flat), like round leaves in Allium or needle-like leaves in Pinus or some Proteaceae. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: phyllome lamina^c; part_of^op some leaf^c

leaf lamina abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000049

has super-classes: leaf lamina epidermis^c; leaf abaxial epidermis^c
has sub-classes: cigar leaf lamina abaxial epidermis^c

leaf lamina adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000050

has super-classes: leaf lamina epidermis^c; leaf adaxial epidermis^c

leaf lamina areole^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025392

Any order of leaf lamina vein can form the sides of a leaf lamina areole. Taken together, the leaf lamina areoles form a contiguous field of polygons over the area of a leaf lamina. Free ending veinlets (PO:0025390) may be found within a leaf lamina areole.

is equivalent to: phyllome lamina areole^c and (part_of^op some leaf lamina^c)
has super-classes: phyllome lamina areole^c; part_of^op some leaf lamina^c

leaf lamina base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008019

has super-classes: cardinal organ part^c; part_of^op some leaf lamina^c

leaf lamina crena^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025519

See leaf lamina tooth (PO:0025518) for a small angular projection. The corresponding leaf sinus may be rounded or angular.

is equivalent to: phyllome lamina crena^c and (part_of^op some leaf^c)
has super-classes: phyllome lamina crena^c; part_of^op some leaf^c

leaf lamina epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000047

is equivalent to: leaf epidermis^c and (part_of^op some leaf lamina^c)
has super-classes: leaf epidermis^c; part_of^op some leaf lamina^c
has sub-classes: leaf lamina abaxial epidermis^c, leaf lamina adaxial epidermis^c, leaf lamina stomatal complex^c

leaf lamina intramarginal vein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025520

The leaf lamina intramarginal vein is much thinner than the leaf midvein (PO:0020139; syn: midrib), and is of constant thickness.

has super-classes: leaf lamina vein^c

leaf lamina lobe^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025517

A leaf lobe may be either rounded or angular at the tip, and may have leaf teeth (PO:0025518) or leaf crenae (PO:0025519) on its margin. The corresponding leaf sinus may be rounded or angular.

is equivalent to: phyllome lamina lobe^c and (part_of^op some leaf^c)
has super-classes: phyllome lamina lobe^c; part_of^op some leaf^c

leaf lamina margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025009

has super-classes: leaf margin^c; part_of^op some leaf lamina^c

leaf lamina stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025185

has super-classes: leaf lamina epidermis^c; leaf stomatal complex^c

leaf lamina tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025589

This is the portion of the leaf lamina (PO:0020039) that is furthest away from the stem (PO:0009047).

has super-classes: leaf tip^c

leaf lamina tooth^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025518

See leaf lamina crena (PO:0025519) for a small rounded projection. The corresponding leaf sinus may be rounded or angular.

is equivalent to: phyllome lamina tooth^c and (part_of^op some leaf^c)
has super-classes: phyllome lamina tooth^c; part_of^op some leaf^c

leaf lamina vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000048

has super-classes: vascular system^c; part_of^op some leaf vascular system^c; part_of^op some leaf lamina^c

leaf lamina vein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020138

has super-classes: phyllome lamina vein^c; part_of^op some leaf lamina vascular system^c
has sub-classes: free ending veinlet^c, higher order leaf vein^c, leaf lamina intramarginal vein^c, primary leaf vein^c, quaternary leaf vein^c, secondary leaf vein^c, tertiary leaf vein^c

leaf margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020128

is equivalent to: phyllome margin^c and (part_of^op some leaf^c)
has super-classes: phyllome margin^c; part_of^op some leaf^c
has sub-classes: cotyledon margin^c, leaf lamina margin^c

leaf marginal meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025405

Leaf marginal meristems develop on the lateral margins of a vascular leaf after the transition from a vascular leaf primordium (PO:0000017) and may contribute to expansion of the leaf lamina (PO:0020039). Marginal growth can occur in a vascular leaf primordium, but it is not considered part of a leaf marginal meristem. Leaf marginal initials (add) may give rise to leaf epidermis (PO:0006016) while leaf submarginal initials (add) may give rise to the leaf mesophyll (PO:0005645). May be of limited duration.

has super-classes: b f o 0000002; phyllome marginal meristem^c; part_of^op some leaf lamina margin^c; participates_in^op some vascular leaf expansion stage^c; part_of^op some vascular leaf^c

leaf meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030011

Occurs in the non-vascular leaves of bryophytes and the vascular leaves of some ferns. Only in plants where leaf growth is apical.

has super-classes: shoot meristematic apical cell^c; part_of^op some leaf apex^c
has sub-classes: non-vascular leaf meristematic apical cell^c, vascular leaf meristematic apical cell^c

leaf mesophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005645

has super-classes: mesophyll^c; part_of^op some leaf^c

leaf mesophyll intercellular space^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025380

Includes the air spaces in the spongy mesophyll (PO:0005647), the palisade mesophyll (PO:0005648) and substomatal cavity (PO:0025382).

is equivalent to: intercellular space^c and (part_of^op some leaf mesophyll^c)
has super-classes: intercellular space^c; part_of^op some leaf mesophyll^c
has sub-classes: leaf substomatal cavity^c, palisade mesophyll intercellular space^c, spongy mesophyll intercellular space^c

leaf midvein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020139

Often the most prominent vein of a vascular leaf. See costa (PO:0030072) for the central conductive strand of a non-vascular leaf (PO:0025075).

has super-classes: primary leaf vein^c

leaf papilla cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025167

See leaf papilla (GO:0090396) for the subcellular component leaf papilla. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: papilla cell^c; part_of^op some leaf epidermis^c

leaf pavement cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025212

has super-classes: epidermal pavement cell^c; part_of^op some leaf epidermis^c
has sub-classes: bulliform cell^c, leaf abaxial pavement cell^c, leaf adaxial pavement cell^c, long cell^c, short cell^c

leaf plate meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025429

The activity of a leaf plate meristem results in increase in the surface area, but not thickness of a vascular leaf (PO:0009025).

has super-classes: b f o 0000002; phyllome plate meristem^c; part_of^op some vascular leaf^c; participates_in^op some vascular leaf expansion stage^c

leaf prickle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025175

has super-classes: leaf epidermis^c; prickle^c

leaf procambial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000063

Leaf procambial cells may be derived from the shoot apical meristem or can arise throughout the mesophyll of a developing leaf.

has super-classes: procambial cell^c; part_of^op some leaf procambium^c

leaf procambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025259

has super-classes: shoot procambium^c

leaf production stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007133

This stage is recommended over rosette growth or stem elongation as it is most easily observed and least ambiguous.

has super-classes: 1 main shoot growth stage^c
has sub-classes: LP.01 one leaf visible stage^c, LP.02 two leaves visible stage^c, LP.03 three leaves visible stage^c, LP.04 four leaves visible stage^c, LP.05 five leaves visible stage^c, LP.06 six leaves visible stage^c, LP.07 seven leaves visible stage^c, LP.08 eight leaves visible stage^c, LP.09 nine leaves visible stage^c, LP.10 ten leaves visible stage^c, LP.11 eleven leaves visible stage^c, LP.12 twelve leaves visible stage^c, LP.13 thirteen leaves visible stage^c, LP.14 fourteen leaves visible stage^c, LP.15 fifteen leaves visible stage^c, LP.16 sixteen leaves visible stage^c, LP.17 seventeen leaves visible stage^c, LP.18 eighteen leaves visible stage^c, LP.19 nineteen leaves visible stage^c, LP.20 twenty or more leaves whorls visible stage^c

leaf rachis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020055

has super-classes: stalk^c; part_of^op some compound leaf^c
has sub-classes: leaf rachis tendril^c

leaf rachis tendril^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025366

Aids plant in climbing. Differs from a leaf tendril, in that a leaf rachis tendril bear leaflets. See also leaf tendril (PO:0025361), leaflet tendril (PO:0025362), leaf apex tendril (PO:0025363), branch tendril (PO:0025364), stem apex tendril (PO:0025365), and prophyll tendril (PO:0025366). Careful observation is required to correctly classify some tendrils.

has super-classes: leaf rachis^c

leaf sheath^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020104

A leaf sheath is usually tubular shaped, and is found in the Poaceae family and other monocots.

has super-classes: cardinal organ part^c; part_of^op some vascular leaf^c

leaf sheath abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025250

has super-classes: leaf sheath epidermis^c

leaf sheath adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025251

has super-classes: leaf sheath epidermis^c

leaf sheath auricle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020106

May wrap around the stem (PO:0009047) or branch (PO:0025073) to which the vascular leaf (PO:0009025) it is part of is attached. Found in some Poaceae.

has super-classes: cardinal organ part^c; part_of^op some leaf sheath^c

leaf sheath epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025249

is equivalent to: leaf epidermis^c and (part_of^op some leaf sheath^c)
has super-classes: leaf epidermis^c; part_of^op some leaf sheath^c
has sub-classes: leaf sheath abaxial epidermis^c, leaf sheath adaxial epidermis^c

leaf sheath margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025619

has super-classes: cardinal organ part^c; part_of^op some leaf sheath^c

leaf sheath pulvinus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008017

has super-classes: pulvinus^c; part_of^op some leaf sheath^c

leaf sinus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025384

Can be angular or rounded.

has super-classes: phyllome sinus^c; part_of^op some leaf margin^c

leaf stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025183

has super-classes: leaf epidermis^c; phyllome stomatal complex^c
has sub-classes: leaf abaxial stomatal complex^c, leaf adaxial stomatal complex^c, leaf lamina stomatal complex^c, petiole stomatal complex^c

leaf stomatal pore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025235

has super-classes: phyllome stomatal pore^c; part_of^op some leaf stomatal complex^c

leaf substomatal cavity^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025399

has super-classes: leaf mesophyll intercellular space^c; phyllome substomatal cavity^c; adjacent_to^op some leaf stomatal pore^c

leaf tendril^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025361

Aids plant in climbing. A leaf tendril will usually have a bud or shoot axis in its axil. See also leaflet tendril (PO:0025362), leaf apex tendril (PO:0025363), branch tendril (PO:0025364), stem apex tendril (PO:0025365), leaf rachis tendril (PO:0025366), and prophyll tendril (PO:0025367). Careful observation is required to correctly classify some tendrils.

has super-classes: vascular leaf^c

leaf tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025142

This term is to be used for only the apical most portion of a leaf. For a larger area, use the term leaf apex. Use this term when describing the shape of a leaf tip. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: phyllome tip^c; part_of^op some leaf apex^c
has sub-classes: leaf lamina tip^c

leaf trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006504

has super-classes: phyllome trichome^c; part_of^op some leaf epidermis^c
has sub-classes: leaf abaxial trichome^c, leaf adaxial trichome^c

leaf trichome development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007039

has super-classes: trichome development stage^c; has_participant^op some leaf trichome^c
has sub-classes: 1 pattern formation stage^c, 2 endoreduplication stage^c, 3 branch formation stage^c, 4 growth directionality stage^c

leaf vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000036

has super-classes: phyllome vascular system^c; part_of^op some vascular leaf^c

leaf whorl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008034

This term was made obsolete, because its definition did not match the new ontology structure as a child of collective phyllome structure. Annotations for this term are now associated with the new term collective leaf structure (PO:0025022).

leaf-derived cultured plant cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000007

May be derived from cultured plant callus or plant protoplast that was induced from a segment of leaf. In the case of the plant protoplast, after the re-establishment cell walls.

has super-classes: cultured plant cell^c; derives_by_manipulation_from^op some leaf^c

leaflet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020049

has super-classes: cardinal organ part^c; part_of^op some compound leaf^c
has sub-classes: leaflet tendril^c

leaflet margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006034

has super-classes: cardinal organ part^c; part_of^op some leaflet^c

leaflet primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025481

Leaflets of palms does not develop from leaflet primordia but by separation of segments of a leaf lamina (PO:0020039).

has super-classes: primordium^c; part_of^op some vascular leaf primordium^c

leaflet tendril^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025362

Aids plant in climbing. If the tendril is derived from the terminal leaflet, use this term instead of leaf apex tendril (PO:xxxx). See also leaf tendril (PO:0025361), leaf apex tendril (PO:0025363), branch tendril (PO:0025364), stem apex tendril (PO:0025365), leaf rachis tendril (PO:0025366), and prophyll tendril (PO:0025367). Careful observation is required to correctly classify some tendrils.

has super-classes: leaflet^c

legume fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030100

Legume fruit (PO:0030100) is characteristic of the plant family Fabaceae. Examples: pigeon pea (Cajanus cajan), chickpea (Cicer arietinum), peanut (Arachis hypogaea), soybean (Glycine max), and lentil (Lens culinaris subsp. culinaris).

has super-classes: fruit^c
has sub-classes: loment fruit^c

lemma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009037

A lemma (PO:0009037) and palea (PO:0009038) enclose an individual spikelet floret (PO:0009082). The lemma is usually the larger of the two. Since it is not clear what the lemma and palea correspond to in conventional flowers, no assumptions of homology are made. If you are annotating to this structure for Zea species an annotation can also be made to the more specific floret type, if known. Choose the most specific term possible from: ear floret (PO:0006354), lower floret of pedicellate spikelet of ear (PO:0006353), lower floret of sessile spikelet of ear (PO:0006351), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316). Found in Found in Poaceae, Cyperaceae and other Poales.

has super-classes: flower bract^c; part_of^op some spikelet floret^c
has sub-classes: fertile lemma^c, sterile lemma^c

lemma apiculus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025616

has super-classes: cardinal organ part^c; part_of^op some lemma^c

lemma awn^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006032

has super-classes: awn^c; part_of^op some lemma^c

lemma development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001047

has super-classes: b f o 0000003; phyllome development stage^c; part_of^op some floral organ differentiation stage^c
has sub-classes: fully expanded lemma stage^c, lemma differentiation and expansion stage^c, lemma primordia visible stage^c

lemma differentiation and expansion stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001056

has super-classes: lemma development stage^c

lemma primordia visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001055

The lemma primordium forms in 1/2 alternate phylotaxy in rice spikelet.

has super-classes: lemma development stage^c

lenticel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000031

Lenticels are produced by the cork cambium (PO:0005599) and facilitate gas exchange.

has super-classes: periderm^c; part_of^op some root periderm^c; part_of^op some shoot axis periderm^c

leptoid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025033

A carbohydrate and amino acid conducting cell found in bryophytes in axes and leaves in the gametophyte development stage (PO:0028003) and in the seta in the sporophytic phase. Leptoids have no nucleus at maturity. Carbohydrate and amino acid conducting cells in bryophytes range from conducting parenchyma cells that are indistinguishable from other parenchyma cells to 'leptoids sensu strictu' that are structurally comparable to sieve elements in vascular plants, as well as many intermediate forms. The term leptoid is used for cells that are distinguishable from other parenchyma cells, whether they be intermediate or leptoids sensu strictu.

has super-classes: native plant cell^c; part_of^op some leptome^c
is disjoint with: sieve element^c

leptome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030048

A leptome is composed of only leptoids (PO:0025033). Found in bryophytes, in non-vascular shoot axes such as a gametophore axis or seta (PO:0030032) or in the midrib of a non-vascular leaf. Often surrounding a central hydrome. May function in the conduction of organic substances, similar to phloem in vascular plants.

has super-classes: portion of plant tissue^c
is disjoint with: phloem^c

libriform fiber cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004520

Libriform fiber cells have simple (unbordered) pits while fiber tracheids (PO:0000355) have bordered pits. Many intermediate forms exist and are generally classified as fiber tracheids (PO:0000355). If both libriform fiber cells and fiber tracheids are present, the libriform fiber cells usually have thicker walls. Libriform fiber cells have a slit-like aperture toward the cell lumen, but no pit cavity.

has super-classes: xylem fiber cell^c
has sub-classes: septate libriform fiber cell^c

life of whole plant stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025337

There are only two types of life of whole plant. Every life of a whole plant is either a maximal gametophyte stage or a maximal sporophyte stage.

has super-classes: whole plant development stage^c

ligule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020105

has super-classes: cardinal organ part^c; part_of^op some vascular leaf^c

locule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025263

May be a cavity in a sporophyll, within several fused sporophylls, or within a sporangium. In many instances, the locules are filled with seeds or other plant structures.

has super-classes: plant anatomical space^c
has sub-classes: fruit locule^c, plant ovary locule^c, sporangium locule^c

loculicidal capsule fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030092

When annotating to a capsule fruit (PO:0030091) which dehisces through both the fruit septa (PO:0025268) and fruit locules (PO:0025270), annotate to coccarium capsule fruit (PO:0030094). When annotating to a capsule fruit which only dehisces through the fruit septa, annotate to septicidal capsule fruit (PO:0030093). Examples: cotton (Gossypium raimondii) and rose mallow (Hibiscus syriacus).

has super-classes: capsule fruit^c

lodicule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009036

May represent a reduced floral structure. If you are annotating to this structure for Zea mays, please also add an annotation to the corresponding floret type, if known. Choose the most specific term possible from: ear floret (PO:0006354), lower floret of pedicellate spikelet of ear (PO:0006353), lower floret of sessile spikelet of ear (PO:0006351), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: phyllome^c; floral organ^c; develops_from^op some lodicule primordium^c; part_of^op some spikelet floret^c

lodicule anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025483

has super-classes: phyllome anlagen^c

lodicule development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001049

has super-classes: b f o 0000003; phyllome development stage^c; part_of^op some floral organ differentiation stage^c
has sub-classes: fully expanded lodicule stage^c, lodicule differentiation and expansion stage^c, lodicule primordia visible stage^c

lodicule differentiation and expansion stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001077

has super-classes: lodicule development stage^c

lodicule primordia visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001072

Two lodicules form on the side of the lemma in rice spikelet.

has super-classes: lodicule development stage^c

lodicule primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008040

has super-classes: phyllome primordium^c; floral organ primordium^c; develops_from^op some lodicule anlagen^c

loment fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030101

The pericarp (PO:0009084) of some legume fruit (PO:0030100), such as peanuts, is constricted between each seed, but these constrictions are due to a lack of support of the pericarp (PO:0009084) in the space between the seeds (PO:0009010). Contrastingly, the constrictions in the pericarp of loment fruits (PO:0030101) are sclerified and contain regions where cell death leads to disarticulation of the fruit (PO:0009001). Examples: some members of Fabaceae, including Mimosa and Desmodium spp.

has super-classes: legume fruit^c

long cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004717

In the leaf epidermis of Poaceae and Joinvilleaceae, long cells and short cells often alternate in longitudinal rows. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: leaf pavement cell^c; part_of^op some vascular leaf^c

long lateral tassel branch^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009101

has super-classes: b f o 0000004; tassel inflorescence branch^c; develops_from^op some long lateral tassel branch meristem^c

long lateral tassel branch meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009104

has super-classes: tassel inflorescence axillary meristem^c; part_of^op some first order tassel inflorescence axis^c

long shoot^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004702

has super-classes: axillary shoot system^c

lower floret of pedicellate spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006353

The lower floret on the ear does not usually develop into a functional one.

has super-classes: ear floret^c; part_of^op some ear pedicellate spikelet^c

lower floret of pedicellate spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006313

has super-classes: tassel floret^c; part_of^op some tassel pedicellate spikelet^c

lower floret of sessile spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006351

This floret does not usually develop into a functional one.

has super-classes: ear floret^c; part_of^op some ear sessile spikelet^c

lower floret of sessile spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006315

has super-classes: tassel floret^c; part_of^op some tassel sessile spikelet^c

lower glume^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006002

has super-classes: glume^c
has sub-classes: lower glume of ear spikelet^c, lower glume of tassel spikelet^c

lower glume of ear spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006369

has super-classes: lower glume^c; glume of ear spikelet^c
has sub-classes: lower glume of pedicellate spikelet of ear^c, lower glume of sessile spikelet of ear^c

lower glume of pedicellate spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006437

has super-classes: lower glume of ear spikelet^c; part_of^op some ear pedicellate spikelet^c

lower glume of pedicellate spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006385

has super-classes: lower glume of tassel spikelet^c; part_of^op some tassel pedicellate spikelet^c

lower glume of sessile spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006438

has super-classes: lower glume of ear spikelet^c; part_of^op some ear sessile spikelet^c

lower glume of sessile spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006386

has super-classes: lower glume of tassel spikelet^c; part_of^op some tassel sessile spikelet^c

lower glume of tassel spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006372

has super-classes: lower glume^c; glume of tassel spikelet^c
has sub-classes: lower glume of pedicellate spikelet of tassel^c, lower glume of sessile spikelet of tassel^c

LP.01 one leaf visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007094

In the taxa with hypogeal type germination the first leaf on the epicotyl is leaf 1, and in grasses, the coleoptile is leaf 1. The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.02 two leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007098

In grasses, the plant has one leaf plus the coleoptile. The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.03 three leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007106

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.04 four leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007115

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.05 five leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007065

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.06 six leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007123

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.07 seven leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007063

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.08 eight leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007095

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.09 nine leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007101

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.10 ten leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007103

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.11 eleven leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007116

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.12 twelve leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007064

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.13 thirteen leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007083

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.14 fourteen leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007085

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.15 fifteen leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007104

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.16 sixteen leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007119

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.17 seventeen leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007067

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.18 eighteen leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007072

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.19 nineteen leaves visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007120

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

LP.20 twenty or more leaves whorls visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007082

The leaves can be a single leaf, two, or whorls of leaves at each node.

has super-classes: leaf production stage^c

lupulin gland^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005030

One of the major chalconoids from hops is xanthohumol (CHEBI:66331).

has super-classes: glandular trichome^c

lysigenous aerenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005706

The term was made obsolete because lysigenous form is an attribute of regular aerenchyma.

M germinated pollen stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001017

has super-classes: pollen development stage^c
has sub-classes: N second mitotic division stage in germinating pollen^c

male archesporial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006014

Found in heterosporous ferns and seed plants. May also give rise to sterile cells. In seed plants, a male archesporial cell undergoes periclinal division, giving rise to an inner primary sporogenous cell layer and an outer primary parietal cell.

has super-classes: archesporial cell^c; part_of^op some microsporangium^c

mature dispersal unit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009091

mature plant embryo stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001081

In some seed plants, this occurs some time after the fruit ripening stage (PO:0025502) and after the dispersal of the seed (PO:0009010). This stage may be very short in plants that do not enter a plant embryo dormant stage (PO:0025377).

has super-classes: plant embryo development stage^c
has sub-classes: plant embryo dormant stage^c

megagametophyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025279

Megagametophytes in bryophytes only produce egg cells, but do not develop from megaspores, because there is no heterospory in bryophytes. In some pteridophytes, megagametophytes develop from megaspores. In angiosperms, Gnetum, and Weltwischia, the megagametophyte is greatly reduced. The megagametophyte in angiosperms is an embryo sac.

has super-classes: whole plant^c
has sub-classes: archegonium megagametophyte^c, embryo sac^c

megagametophyte development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007621

Although megaspore and megagametophyte development are normally separate, one spore producing one gametophyte, in some flowering plants a single gametophyte may be produced from two or four spores.

has super-classes: gametophyte development stage^c; part_of^op some ovule development stage^c
has sub-classes: A megaspore mother cell enlarges stage^c, B meiosis of megaspore mother cell stage^c, C tetrad of megaspores stage^c, D megaspore degeneration stage^c, E two nucleate megagametophyte stage^c, F four nucleate megagametophyte stage^c, G eight nucleate megagametophyte stage^c

megaphyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020052

megasporangiate strobilus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005032

has super-classes: strobilus^c

megasporangium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025201

has super-classes: sporangium^c
has sub-classes: nucellus^c

megasporangium endothecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025310

has super-classes: sporangium wall endothecium^c; part_of^op some megasporangium wall^c

megasporangium exothecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025312

has super-classes: exothecium^c; part_of^op some megasporangium wall^c
has sub-classes: nucellar epidermis^c

megasporangium tapetum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025315

has super-classes: tapetum^c; part_of^op some megasporangium wall^c

megasporangium tapetum cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025564

has super-classes: tapetum cell^c; part_of^op some megasporangium tapetum^c

megasporangium wall^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025308

has super-classes: sporangium wall^c; part_of^op some megasporangium^c

megaspore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020019

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: plant spore^c
has sub-classes: degenerate megaspore^c, functional megaspore^c

megasporocyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000431

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: sporocyte^c; develops_from^op some female archesporial cell^c; part_of^op some megasporangium^c

megasporophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009027

has super-classes: sporophyll^c
has sub-classes: carpel^c

mericarp^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020075

A mericarp develops from one carpel of a syncarpous gynoecium. The pericarp of each carpel are fused together until maturity, at which point the carpellate units separate from one another.

has super-classes: cardinal part of multi-tissue plant structure^c; part_of^op some schizocarp fruit^c

meristamtic zone formation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001027

meristem elaboration^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001000

This term has been obsoleted to keep the structure simple.

meristem L1 layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009020

The cells of the meristem L1 layer divide in a strictly anticlinical fashion.

has super-classes: portion of meristem tissue^c; part_of^op some shoot apical meristem^c

meristem L2 layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009021

Cells in the first subepidermal layer, the L2, divide in a largely anticlinal fashion, forming a completely separate population of cells from the other cell layers. Within developing organs, the meristem L2 layer divides anticlinally and periclinally.

has super-classes: portion of meristem tissue^c; part_of^op some shoot apical meristem^c; part_of^op some shoot system ground meristem^c

meristem L3 layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009022

The meristem L3 layer cells frequently divide in various orientations.

has super-classes: portion of meristem tissue^c; part_of^op some shoot system ground meristem^c; part_of^op some shoot apical meristem^c

meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030007

Apical cells occur only at the tip of a shoot axis apex, leaf apex, root apex, thallus apex, or protonema in bryophytes and some pteridophytes. Apical growth results from division of a single meristematic cell located at the tip of an apical meristem or plant organ, rather than from a population of meristematic cells located at the tip of an apical meristem. The apical cell may be tetrahedral shaped, with three (in shoots) or four (in roots) cutting faces, or wedge-shaped (lenticular) with two cutting faces (in non-vascular leaves or thalli). An apical cell may be established upon germination of a spore or upon the first cell division of an embryo, or later.

has super-classes: meristematic cell^c
has sub-classes: gametophyte meristematic apical cell^c, shoot meristematic apical cell^c, sporophyte meristematic apical cell^c

meristematic cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004010

has super-classes: native plant cell^c
has sub-classes: initial cell^c, meristematic apical cell^c, procambial cell^c

mesarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025553

Mesarch protoxylem is found in ferns and cycads stems.

has super-classes: protoxylem^c

mesocarp^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009087

has super-classes: portion of plant tissue^c; part_of^op some pericarp^c

mesocotyl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020037

Occurs in grasses. In grasses, the hypocotyl and cotyledon may not be visible and may be represented by the scutellar node and scutellum, making the mesocotyl similar to the epicotyl in other taxa. Elongation of the mesocotyl during seedling growth pushes the coleoptile above the soil surface.

has super-classes: stem internode^c
has sub-classes: embryo mesocotyl^c, seedling mesocotyl^c

mesophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006070

has super-classes: chlorenchyma^c
has sub-classes: leaf mesophyll^c, palisade mesophyll^c, petal mesophyll^c, sepal mesophyll^c, spongy mesophyll^c

mesophyll cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004006

has super-classes: chlorenchyma cell^c; part_of^op some mesophyll^c
has sub-classes: palisade mesophyll cell^c, spongy mesophyll cell^c

mestome sheath^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006025

has super-classes: bundle sheath^c

metaphloem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006076

Metaphloem develops after a portion of vascular tissue (PO:0009015) has stopped elongating, in the same location as the protophloem, replacing the protophloem. Sieve elements in the metaphloem are larger than in the protophloem. Develops before the secondary phloem, if any is formed.

has super-classes: primary phloem^c

metaxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000372

Metaxylem has larger tracheary elements (PO:0000290) than the protoxylem (PO:0000272), and develops after the formation of the protoxylem, once elongation of the plant axis (PO:0025004) has completed.

has super-classes: primary xylem^c

metaxylem tracheary element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025576

In a given portion of primary xylem (PO:0005849), metaxylem tracheary elements are generally larger in size, greater in number, are pitted and have more secondary wall material than protoxylem tracheary elements (PO:0025575).

has super-classes: primary xylem tracheary element^c; part_of^op some metaxylem^c

metaxylem tracheid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025621

has super-classes: primary xylem tracheid^c

metaxylem vessel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025620

Metaxylem vessels are composed of metaxylem vessel members (elements; PO:0025622).

has super-classes: primary xylem vessel^c

metaxylem vessel member^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025622

has super-classes: primary xylem vessel member^c; part_of^op some metaxylem vessel^c

microgametophyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025280

The microgametophyte in bryophytes only produce sperm cells, but do not develop from microspores, because there is no heterospory in bryophytes. In seed plants the male gametophyte is reduced to a pollen grain.

has super-classes: whole plant^c
has sub-classes: antheridium microgametophyte^c, pollen^c

microgametophyte development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025602

has super-classes: gametophyte development stage^c
has sub-classes: pollen development stage^c

microgametophyte vegetative cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020099

has super-classes: native plant cell^c; part_of^op some microgametophyte^c

microgametophytic cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025027

This term was made obsolete because it is not appropriate for non-seed plants.

microphyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020053

micropylar endosperm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000200

has super-classes: portion of plant tissue^c; part_of^op some endosperm^c

microsporangiate strobilus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005031

has super-classes: strobilus^c

microsporangium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025202

has super-classes: sporangium^c
has sub-classes: pollen sac^c

microsporangium endothecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025309

has super-classes: sporangium wall endothecium^c; part_of^op some microsporangium wall^c
has sub-classes: anther wall endothecium^c

microsporangium exothecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025311

has super-classes: exothecium^c; part_of^op some microsporangium wall^c
has sub-classes: anther wall exothecium^c

microsporangium tapetum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025314

has super-classes: tapetum^c; part_of^op some microsporangium wall^c
has sub-classes: anther wall tapetum^c

microsporangium tapetum cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025544

has super-classes: tapetum cell^c; part_of^op some microsporangium tapetum^c
has sub-classes: anther wall tapetum cell^c

microsporangium wall^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025307

has super-classes: sporangium wall^c; part_of^op some microsporangium^c
has sub-classes: anther wall^c

microspore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020048

has super-classes: plant spore^c

microspore-derived cultured plant embryo^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025305

has super-classes: cultured somatic plant embryo^c

microsporocyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020047

has super-classes: sporocyte^c; part_of^op some microsporangium^c; develops_from^op some primary sporogenous cell^c

microsporophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009028

has super-classes: sporophyll^c
has sub-classes: stamen^c, staminode^c

mid rosette growth stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007068

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: rosette growth stage^c

mid whole plant fruit ripening stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007031

has super-classes: whole plant fruit ripening stage^c

modified aleurone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008008

has super-classes: aleurone layer^c

monarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025558

has super-classes: root system exarch protoxylem^c

mucilage cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000373

Functional term

multi-tissue plant structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025496

Most multi-tissue plant structures have at least a small connection to other plant structures via a fiat boundary, such as where a leaf (PO:0025034) connects to a shoot axis (PO:0025029), a petal (PO:0009032) connects to a receptacle (PO:0009064), or a branch (PO:0025073) connects to a stem (PO:0009047). Refers to CARO:0000055 multi-tissue structure, def'n: Anatomical structure that has as parts two or more portions of tissue of at least two different types, and which through specific morphogenetic processes, form a single distinct structural unit demarcated by bona-fide boundries from other structural units of differnt types.

has super-classes: plant structure^c
has sub-classes: fruit^c, plant organ^c, seed^c

multi-tissue plant structure development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025571

has super-classes: plant structure development stage^c
has sub-classes: fruit development stage^c, plant organ development stage^c, seed development stage^c

multicellular plant gametangium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025124

The multicellular plant gametangium; an archegonium (PO:0025126) and/or an antheridium (PO:0025125), occurs in bryophytes, pteridophytes and gymnosperms, but never in angiosperms.

has super-classes: b f o 0000002; plant organ^c; participates_in^op some gametophyte development stage^c
has sub-classes: antheridium^c, archegonium^c

multicellular trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025162

A multicellular trichome (PO:0000282) has as parts more than one trichome cell (PO:0008030), may vary in size and complexity, be branched and may contain a secretory gland.

has super-classes: trichome^c; portion of plant tissue^c; develops_from^op some epidermis^c
has sub-classes: axillary hair^c, paraphysis^c

multicellular trichome apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025551

This term describes the apex region of a multicellular trichome (PO:0000282). The apex of a unicellular trichome is a GO cellular component: unicellular trichome apex (GO:0090552).

has super-classes: trichome apex^c

multicellular trichome branch cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025163

For branches of a unicellular trichome, see unicellular trichome branch (GO:0090405) in GO.

has super-classes: trichome cell^c

multicellular trichome tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025535

This term describes the apex region of a tip of a multicellular trichome (PO:0000282). The tip may be various shapes. A tip of a unicellular trichome is a GO cellular component term; unicellular trichome tip (GO:0090553).

has super-classes: portion of plant tissue^c; trichome tip^c; part_of^op some multicellular trichome^c; part_of^op some multicellular trichome apex^c

multiple fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020086

myrosin cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000352

has super-classes: ground tissue cell^c

N second mitotic division stage in germinating pollen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001074

has super-classes: M germinated pollen stage^c

native plant cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025606

A native plant cell is one that is not grown or maintained in vitro, nor part of an in vitro plant structure (PO:0000004).

has super-classes: plant cell^c
has sub-classes: alar cell^c, antheridium jacket layer cell^c, archegonium central cell^c, archegonium neck canal cell^c, archesporial cell^c, brachycyte^c, embryo plant cell^c, embryo sac cell^c, epidermal cell^c, ground tissue cell^c, hydroid^c, idioblast^c, leptoid^c, meristematic cell^c, microgametophyte vegetative cell^c, phyllome founder cell^c, plant gamete^c, plant zygote^c, pollen tube cell^c, primary parietal cell^c, primary sporogenous cell^c, prothallial cell^c, sieve element^c, spermatogenous cell^c, sporocyte^c, tapetum cell^c, tmema cell^c, tracheary element^c, trichome cell^c, unicellular plant gametangium^c, unicellular trichome^c, ventral canal cell^c

nectary^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009035

has super-classes: portion of secretory tissue^c; part_of^op some shoot system^c
has sub-classes: extrafloral nectary^c, flower nectary^c, nectary parenchyma^c

nectary epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000207

is equivalent to: shoot system epidermis^c and (part_of^op some nectary^c)
has super-classes: shoot system epidermis^c; part_of^op some nectary^c

nectary parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000309

has super-classes: nectary^c; part_of^op some parenchyma^c

nexine^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020011

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043672.

ninth order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025110

has super-classes: higher order inflorescence axis^c

ninth order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025254

has super-classes: higher order infructescence axis^c

non-articulated laticifer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005007

This term was made obsolete because a nom-articulated laticifer is not a tissue type but consists of a single cell. Use non-articulated laticifer cell (PO:0006222) instead.

non-articulated laticifer cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006222

May be coenocytic (multi-nucleate) and branched and may grow intrusively between other plant cells (PO:0009002).

has super-classes: laticifer cell^c

non-hair root epidermal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000263

Compare to root hair cell (PO:0000256), which develops from a trichoblast (PO:0000262).

has super-classes: b f o 0000004; root epidermal cell^c; develops_from^op some epidermal initial cell^c

non-pericyclic lateral root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025495

A non-pericyclic lateral root primordium develops from cells that are not part of a pericycle (PO:0006203). Develops from cells in an endodermis (PO:0000252) in ferns and some seed plants.

has super-classes: lateral root^c; develops_from^op some non-pericyclic lateral root primordium^c

non-pericyclic lateral root primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025493

A non-pericyclic lateral root primordium may develop from cells of an endodermis (PO:0000252) in ferns and some seed plants.

has super-classes: lateral root primordium^c

non-vascular leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025075

Non-vascular leaves occur in the gametophyte development stage (PO:0028003) of Bryophytes, plants such as moss and liverwort.

has super-classes: leaf^c; part_of^op some gametophore^c

non-vascular leaf development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025573

has super-classes: leaf development stage^c

non-vascular leaf initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030087

In Physcomitrella patens, non-vascular leaf initials arise from the daughter cells of a gametophore axis apical cell. Subsequent division of a non-vascular leaf initial establishes a non-vascular leaf apical cell.

has super-classes: initial cell^c; part_of^op some gametophore^c

non-vascular leaf meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030013

Occurs in the non-vascular leaves of bryophytes, which grow by division of a single, wedge-shaped apical cell with two cutting faces.

has super-classes: b f o 0000004; leaf meristematic apical cell^c; gametophore meristematic apical cell^c; develops_from^op some non-vascular leaf initial cell^c; part_of^op some non-vascular leaf^c

nucellar epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008006

has super-classes: megasporangium exothecium^c; part_of^op some nucellus^c

nucellar plant embryo^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004537

Common in Citrus.

has super-classes: somatic plant embryo^c

nucellar projection^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008007

has super-classes: portion of plant tissue^c; part_of^op some nucellus^c

nucellus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020020

In seed plants, the megaspores and megagametophyte are retained within the nucellus. If you are annotating to this structure for an angiosperm, please add an additional annotation to plant ovary ovule (PO:0025490). If you are annotating to this structure for an gymnosperm, please add an additional annotation to ovuliferous scale ovule (PO:0025491). If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: megasporangium^c; part_of^op some plant ovule^c
has sub-classes: fruit nucellus^c

nut fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030102

The common names of some species do not accurately reflect their fruit type. For example, the fruit (PO:0009001) of the peanut plant is a legume fruit (PO:0030100) rather than a nut fruit (PO:0030102). Example: pecan (Carya illinoinensis), walnut (Juglans regia), pistachio (Pistacia vera), lotus (Nelumbo nucifera), and acorn (Quercus spp.).

has super-classes: fruit^c

obsolete apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004000

This term was originally named apical cell. It was made obsolete to avoid confusion with the new term apical cell (PO:0030007). This term is replaced by embryonic apical cell (PO:0025284).

obsolete basal endosperm transfer layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009019

This term was made obsolete because the definition was wrong. Replace by new term with same name but corrected definition.

obsolete fruit septum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005008

This term was made obsolete because it was ambiguous. It has been replaced by the more precise terms fruit septum (PO:0025268) and fruit replum (PO:0025267). Annotations for Arabidopsis should go to fruit replum.

obsolete growth and development terms^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007060

obsolete lateral root elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003014

This term was made obsolete because the definition was not correct. A new term with the same name and correct definitions was created to replace it.

obsolete megagametophyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020092

This term was made obsolete because it only applied to angiosperms. Consider new term megagametophyte (PO:0025280) that can apply to all plants. Also consider embryo sac (PO:0025074) or archegonial megagametophyte (PO:0025282).

obsolete microgametophyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020091

This term was made obsolete because it only applied to angiosperms. Consider new term microgametophyte (PO:0025280) that can apply to all plants. Also consider pollen (PO:0025281) or antheridial microgametophyte (PO:0025283).

obsolete plant growth and development terms^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007532

obsolete plant structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006300

obsolete pollen sac^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009070

This term was made obsolete because the definition was incorrect. Replaced by PO:0025277.

obsolete primary root elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003003

This term was made obsolete because the definition was not correct. A new term with the same name and correct definitions was created to replace it.

obsolete primary vascular tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006078

Redundant to sec ...

obsolete procambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006074

This term was made obsolete because the parentage and definition changed slightly. It is replaced by PO:0025275.

obsolete secondary vascular tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006080

Redundant sec phloem and xylem

obsolete shoot procambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006306

This term was made obsolete because the definition was changed. It was replaced by PO:0025276.

obturator^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020029

Most commonly arising from the funicle, also developing from placenta, integument, etc.

has super-classes: b f o 0000004; portion of plant tissue^c; develops_from^op some funicle^c

oil gland^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005669

Oil glands are schizogenous.

has super-classes: portion of secretory tissue^c

ordinary companion cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025459

Found in plants that use apoplastic phloem loading. Unlike sieve tube elements (PO:0000289), ordinary companion cells retain their nuclei and other organelles at maturity.

has super-classes: companion cell^c

organogenic callus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006090

Plant organs may be formed after the cultured plant callus is treated with plant growth regulators.

has super-classes: cultured plant callus^c

outer integument^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020023

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: integument^c

outer integument epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006045

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: integument epidermis^c; part_of^op some outer integument^c

outer vascular cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004522

has super-classes: vascular cambium^c

ovule development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007619

has super-classes: gynoecium development stage^c
has sub-classes: ovule differentiation and expansion stage^c, ovule primordium visible stage^c

ovule differentiation and expansion stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004504

has super-classes: ovule development stage^c
has sub-classes: integument initiation stage^c

ovule primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000018

The transition from ovule primordium to ovule occurs when an integument (PO:0020021) begins to develop from the protoderm (PO:0006210).

has super-classes: floral organ primordium^c

ovule primordium visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007620

has super-classes: ovule development stage^c

ovuliferous scale ovule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025491

Found in conifers.

has super-classes: plant ovule^c

p o 0000070^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000070

p o 0000080^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000080

p o 0000275^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000275

p o 0000286^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000286

p o 0000296^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000296

p o 0001043^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001043

p o 0001076^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001076

p o 0001177^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001177

p o 0003001^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003001

p o 0003002^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003002

p o 0003006^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003006

p o 0003007^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003007

p o 0003008^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003008

p o 0003009^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003009

p o 0003010^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003010

p o 0003012^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003012

p o 0003013^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003013

p o 0004510^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004510

p o 0004541^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004541

p o 0004720^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004720

p o 0005049^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005049

p o 0006026^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006026

p o 0006027^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006027

p o 0006028^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006028

p o 0006029^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006029

p o 0006030^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006030

p o 0006031^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006031

p o 0006037^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006037

p o 0006038^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006038

p o 0006046^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006046

p o 0006047^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006047

p o 0006059^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006059

p o 0006064^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006064

p o 0006217^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006217

p o 0006317^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006317

p o 0006318^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006318

p o 0006329^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006329

p o 0006335^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006335

p o 0006337^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006337

p o 0006355^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006355

p o 0006356^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006356

p o 0006357^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006357

p o 0006359^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006359

p o 0006361^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006361

p o 0006363^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006363

p o 0006365^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006365

p o 0006366^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006366

p o 0006373^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006373

p o 0006374^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006374

p o 0006381^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006381

p o 0006382^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006382

p o 0006383^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006383

p o 0006384^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006384

p o 0006391^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006391

p o 0006392^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006392

p o 0006393^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006393

p o 0006394^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006394

p o 0006395^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006395

p o 0006397^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006397

p o 0006399^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006399

p o 0006401^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006401

p o 0006403^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006403

p o 0006404^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006404

p o 0006405^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006405

p o 0006406^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006406

p o 0006407^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006407

p o 0006409^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006409

p o 0006411^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006411

p o 0006413^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006413

p o 0006419^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006419

p o 0006420^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006420

p o 0006421^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006421

p o 0006422^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006422

p o 0006423^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006423

p o 0006424^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006424

p o 0006425^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006425

p o 0006426^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006426

p o 0006427^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006427

p o 0006428^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006428

p o 0006429^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006429

p o 0006430^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006430

p o 0006431^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006431

p o 0006432^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006432

p o 0006433^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006433

p o 0006434^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006434

p o 0006441^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006441

p o 0006442^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006442

p o 0006443^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006443

p o 0006444^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006444

p o 0006445^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006445

p o 0006446^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006446

p o 0006447^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006447

p o 0006448^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006448

p o 0006449^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006449

p o 0006450^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006450

p o 0006451^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006451

p o 0006452^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006452

p o 0006453^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006453

p o 0006454^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006454

p o 0006455^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006455

p o 0006456^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006456

p o 0006457^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006457

p o 0006458^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006458

p o 0006459^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006459

p o 0006460^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006460

p o 0006461^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006461

p o 0006462^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006462

p o 0006463^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006463

p o 0006464^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006464

p o 0006465^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006465

p o 0006466^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006466

p o 0006467^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006467

p o 0006468^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006468

p o 0006469^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006469

p o 0006470^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006470

p o 0006471^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006471

p o 0006472^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006472

p o 0006473^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006473

p o 0006474^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006474

p o 0006475^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006475

p o 0006476^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006476

p o 0006477^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006477

p o 0006478^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006478

p o 0006479^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006479

p o 0006480^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006480

p o 0006481^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006481

p o 0006482^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006482

p o 0006483^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006483

p o 0006484^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006484

p o 0006485^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006485

p o 0006486^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006486

p o 0006487^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006487

p o 0006489^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006489

p o 0006490^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006490

p o 0006491^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006491

p o 0006492^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006492

p o 0006493^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006493

p o 0006494^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006494

p o 0006495^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006495

p o 0006496^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006496

p o 0006497^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006497

p o 0006498^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006498

p o 0006499^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006499

p o 0006500^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006500

p o 0006506^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006506

p o 0006507^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006507

p o 0006508^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006508

p o 0007011^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007011

p o 0007012^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007012

p o 0007020^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007020

p o 0007021^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007021

p o 0007040^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007040

p o 0007055^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007055

p o 0007069^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007069

p o 0007507^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007507

p o 0007617^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007617

p o 0008004^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008004

p o 0008033^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008033

p o 0009024^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009024

p o 0009048^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009048

p o 0009050^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009050

p o 0009076^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009076

p o 0009079^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009079

p o 0009092^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009092

p o 0020007^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020007

p o 0020067^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020067

p o 0020068^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020068

p o 0020069^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020069

p o 0020070^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020070

p o 0020071^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020071

p o 0020072^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020072

p o 0020073^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020073

p o 0020074^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020074

p o 0020076^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020076

p o 0020077^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020077

p o 0020078^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020078

p o 0020079^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020079

p o 0020080^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020080

p o 0020082^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020082

p o 0020083^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020083

p o 0020087^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020087

p o 0020088^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020088

p o 0020089^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020089

p o 0020098^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020098

p o 0020107^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020107

p o 0020111^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020111

p o 0020112^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020112

p o 0020113^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020113

p o 0020114^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020114

p o 0020115^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020115

p o 0020116^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020116

p o 0020117^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020117

p o 0020118^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020118

p o 0020119^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020119

p o 0020120^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020120

p o 0020129^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020129

p o 0025086^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025086

p o 0025087^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025087

p o 0025089^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025089

p o 0025090^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025090

p o 0025091^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025091

p o 0025232^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025232

p o 0025271^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025271

palea^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009038

A lemma (PO:0009037) and palea (PO:0009038) enclose an individual spikelet floret (PO:0009082). The palea is usually the smaller of the two. Since it is not clear what the lemma and palea correspond to in conventional flowers, no assumptions of homology are made. If you are annotating to this structure for Zea species an annotation can also be made to the more specific floret type, if known. Choose the most specific term possible from: ear floret (PO:0006354), lower floret of pedicellate spikelet of ear (PO:0006353), lower floret of sessile spikelet of ear (PO:0006351), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316). Found in Found in Poaceae, Cyperaceae and other Poales.

has super-classes: flower bract^c; part_of^op some spikelet floret^c

palea apiculus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006033

has super-classes: cardinal organ part^c; part_of^op some palea^c

palea awn^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025350

has super-classes: awn^c; part_of^op some palea^c

palea development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001048

has super-classes: b f o 0000003; phyllome development stage^c; part_of^op some floral organ differentiation stage^c
has sub-classes: fully expanded palea stage^c, palea differentiation and expansion stage^c, palea primordia visible stage^c

palea differentiation and expansion stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001070

has super-classes: palea development stage^c

palea primordia visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001058

The palea primordium forms in 1/2 alternate phylotaxy in rice spikelet.

has super-classes: palea development stage^c

palisade mesophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005648

has super-classes: mesophyll^c; part_of^op some vascular leaf^c; part_of^op some leaf mesophyll^c

palisade mesophyll cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006206

Usually found in the adaxil/upper part of the leaf mesophyll. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: mesophyll cell^c; part_of^op some palisade mesophyll^c

palisade mesophyll intercellular space^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025397

has super-classes: leaf mesophyll intercellular space^c; part_of^op some palisade mesophyll^c

palmate leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020046

has super-classes: compound leaf^c

panicle inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030123

Examples include the majority of species in the grass family Poaceae including oats (Avena spp.), brome (Brachypodium spp.), barley (Hordeum vulgare), cutgrass (Leersia perrieri), rice (Oryza spp.), foxgrass (Setaria spp.), wheat (Triticum aestivum), wild rice (Zizania palustris), and the staminate inflorescence of cultivated corn (Zea mays), as well as grapes (Vitis spp.; Vitaceae), and Polemonium caeruleum (Polemoniaceae). Panicle inflorescences are most often conical in shape.

has super-classes: inflorescence^c

papilla cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025166

See plant cell papilla (GO:0090395) for the subcellular component papilla.

has super-classes: epidermal pavement cell^c
has sub-classes: leaf papilla cell^c, stigma papilla cell^c

papillae^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0002001

This terms was made obsolete because it is a sub-cellular compartment. Plant cell papilla (GO:0090395), leaf papilla (GO:0090396), and stigma papilla (GO:0090397) have been added to GO. To annotate to a cell that has a papilla, consider papilla cell (PO:0025166), leaf papilla cell (PO:0025167), or stigma papilla cell (PO:0025168).

pappus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025393

Found in flowers and fruits (cypsela) of the Asteraceae. May aid in dispersal by wind or animals. Considered by some to be an evolutionarily modified upper calyx portion, the lower portion having been incorporated into the floral tube casing adnate to the ovary wall; considered by others to be an outgrowth from the ovary wall.

has super-classes: collective organ part structure^c

pappus element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025394

May be awn-, scale-, or bristle-shaped.

has super-classes: cardinal organ part^c; part_of^op some pappus^c

paraclade cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004721

has super-classes: cortex^c; part_of^op some higher order inflorescence axis^c

paraphyllium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030069

Paraphyllia are much smaller than leaves and may be filamentous, scale-like, or leaf-like. Found in pleurocarpous mosses and a few leafy liverworts.

has super-classes: shoot axis epidermis^c; part_of^op some gametophore axis^c

paraphysis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030070

Found in bryophytes and pteridophytes, especially in mosses.

has super-classes: multicellular trichome^c; participates_in^op some gametophyte development stage^c

parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005421

Parenchyma contains relatively unspecialized cells.

has super-classes: portion of ground tissue^c
has sub-classes: aerenchyma^c, chlorenchyma^c, epiphragm^c, perimedullary zone^c, petal parenchyma^c, petiole parenchyma^c, pith^c, placentoid^c, root parenchyma^c, secondary xylem parenchyma^c, sepal parenchyma^c, storage parenchyma^c

parenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000074

has super-classes: ground tissue cell^c; part_of^op some parenchyma^c
has sub-classes: albuminous cell^c, callus parenchyma cell^c, chlorenchyma cell^c, companion cell^c, epithem cell^c, secondary xylem parenchyma cell^c

parenchyma sheath^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006024

Homologous to the endodermis.

has super-classes: bundle sheath^c

passage cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000353

has super-classes: ground tissue cell^c
has sub-classes: endodermal passage cell^c, exodermal passage cell^c

pedicel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030112

A pedicel has a single internode, determinate growth, and is the ultimate shoot axis (PO:0025029) in a plant. When annotating to this term, use the most specific subclass of pedicel: flower pedicel (PO:0030113), inflorescence flower pedicel (PO:0009052), fruit pedicel (PO:0030114), or infructescence fruit pedicel (PO:0004536).

has super-classes: shoot axis^c
has sub-classes: flower pedicel^c, fruit pedicel^c

pedicel cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004722

has super-classes: cortex^c; part_of^op some pedicel^c

pedicel of ear spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006415

has super-classes: spikelet pedicel^c; part_of^op some ear pedicellate spikelet^c

pedicel of tassel spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006416

has super-classes: spikelet pedicel^c; part_of^op some tassel pedicellate spikelet^c

pedicel vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005012

has super-classes: shoot axis vascular system^c; part_of^op some pedicel^c

peduncle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009053

In plants with single flowers, the peduncle ends with a flower. In plants with inflorescences, the peduncle is the basal end of the primary inflorescence axis, and it ends where the inflorescence begins to branch. The peduncle marks the axial transition from vegetative to reproductive growth. In branching inflorescences, the second order inflorescence axis from the point at which it leaves the main axis up to the point at which it branches again may be called the second order peduncle. Higher order peduncles are also possible.

has super-classes: shoot axis^c; part_of^op some first order inflorescence axis^c
has sub-classes: ear peduncle^c, tassel peduncle^c

peduncle epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025152

has super-classes: branch epidermis^c; part_of^op some peduncle^c

peduncle trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025153

has super-classes: shoot axis trichome^c; part_of^op some peduncle epidermis^c

pentarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025562

has super-classes: root system exarch protoxylem^c

pepo fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030111

A pepo fruit (PO:0030111) is specialized type of berry fruit (PO:0030108) which is encapsuled by persistent, accrescent receptacle (PO:0009064) tissue. The rind, or tough outer covering, of pepo fruits comprises receptical tissue and at least the exocarp (PO:0009085) layer of the pericarp (PO:0009084). Examples: pumpkin (Cucurbita pepo), cucumber (Cucumis sativus), and watermelon (Citrullus lanatus) and banana (Musa acuminata).

has super-classes: berry fruit^c

perianth^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009058

The perianth can consist of only the corolla (PO:0009059), only the calyx (PO:0009060) or it may have both structures in a complete flower. If the petals (PO:0009032) and sepals (PO:0009031) are indistinguishable from one another, the perianth consists of just a collective tepal structure (PO:0025021), composed of one or more tepals (PO:0009033), for example in tulip or lily flowers.

has super-classes: collective phyllome structure^c; part_of^op some flower^c
has sub-classes: collective tepal structure^c, fused perianth^c
is disjoint with: gametophyte perianth^c

periblem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008036

has super-classes: portion of meristem tissue^c

pericarp^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009084

Pericarp comprises endocarp (PO:0009086), mesocarp (PO:0009087), and exocarp (PO:0009085) layers, each of which can be fleshy or dry. If you are annotating to this term, please add an additional annotation to the specific type of fruit (PO:0009001), such as achene fruit (PO:0030107), berry fruit (PO:0030108), capsule fruit (PO:0030091), caryopsis fruit (PO:0030104), drupe fruit (PO:0030103), follicle fruit (PO:0030105), legume fruit (PO:0030100), nut fruit (PO:0030102), samara fruit (PO:0030099), schizocarp fruit (PO:0030098), silique fruit (PO:0030106), or their subclasses, depending on the species.

has super-classes: portion of plant tissue^c; part_of^op some fruit^c

pericarp vascular bundle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025203

has super-classes: vascular bundle^c; part_of^op some pericarp^c

perichaetal bract^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030030

When an archegonium occurs on a specialized lateral branch of the gametophore, all of the phyllomes on that branch are usually perichaetal bracts. If an archegonium occurs on a main axis of the gametophore, only the terminal phyllomes are usually perichaetal bracts. The two or three terminal-most perichaetal bracts may fuse to form a gametophytic perianth.

has super-classes: bract^c; part_of^op some gametophore^c

pericycle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006203

has super-classes: portion of ground tissue^c; part_of^op some root stele^c

pericycle cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025261

has super-classes: ground tissue cell^c; part_of^op some pericycle^c
has sub-classes: phloem pole pericycle cell^c, xylem pole pericycle cell^c

pericyclic lateral root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025494

A pericyclic lateral root primordium develops from cells that are part of a pericycle (PO:0006203). This is the most common type of lateral root in seed plants.

has super-classes: lateral root^c; develops_from^op some pericyclic lateral root primordium^c

pericyclic lateral root primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025492

has super-classes: lateral root primordium^c

periderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005046

After secondary growth, the periderm may replace the epidermis in stems and roots, rarely in other organs. In some cases, the epidermis is retained after periderm development. Periderm is derived from lateral meristem and may contain secondary phloem.

has super-classes: portion of ground tissue^c; part_of^op some plant axis^c
has sub-classes: lenticel^c, root periderm^c, shoot axis periderm^c

perigonial bract^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030028

When an antheridium occurs on a specialized lateral branch of the gametophore, all of the phyllomes on that branch are usually perigonial bracts. If an antheridium occurs on a main axis of the gametophore, usually only the terminal phyllomes are perigonial bracts.

has super-classes: bract^c; part_of^op some gametophore^c

perigynium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009044

has super-classes: prophyll^c

perimedullary zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025058

The term perimedullary zone is only used when the outer layer of the pith is distinct from the inner layer.

has super-classes: parenchyma^c; part_of^op some pith^c
has sub-classes: root perimedullary zone^c, shoot axis perimedullary zone^c

peripheral zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000225

has super-classes: portion of meristem tissue^c; part_of^op some shoot apical meristem^c

perisperm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020058

has super-classes: portion of plant tissue^c; part_of^op some seed^c

peristome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030042

The peristome is located under the operculum, if an operculum is present. Upon maturity of a capsule, the teeth of the peristome open to release the spores.

has super-classes: cardinal organ part^c; part_of^op some sporangium^c

peristome tooth^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030043

Generally triangular. Peristome teeth may be simple or compound, and may be attached by their tips to the epiphragm.

has super-classes: cardinal organ part^c; part_of^op some peristome^c

persistent sepal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025245

May be alive or dead at maturity.

has super-classes: phyllome^c; develops_from^op some sepal^c

persistent stamen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025247

May be alive or dead at maturity.

has super-classes: phyllome^c; develops_from^op some stamen^c

persistent tepal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025246

May be alive or dead at maturity.

has super-classes: phyllome^c; develops_from^op some tepal^c

petal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009032

In some species the petal (PO:0009032) may not be colored.

has super-classes: phyllome^c; floral organ^c; part_of^op some corolla^c; develops_from^op some petal primordium^c
has sub-classes: banner petal^c, free petal^c, fused petal^c, keel petal^c, wing petal^c

petal abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006052

has super-classes: petal epidermis^c

petal adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006053

has super-classes: petal epidermis^c

petal anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025484

has super-classes: phyllome anlagen^c

petal apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025144

It is not precisely defined how far toward the base from the tip a petal apex extends. For the apical most portion of a petal, use the term petal tip.

has super-classes: phyllome apex^c; part_of^op some petal^c

petal base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025146

has super-classes: phyllome base^c; part_of^op some petal^c

petal differentiation and expansion stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007611

has super-classes: corolla development stage^c

petal epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006041

is equivalent to: phyllome epidermis^c and (part_of^op some petal^c)
has super-classes: phyllome epidermis^c; part_of^op some petal^c
has sub-classes: petal abaxial epidermis^c, petal adaxial epidermis^c, petal stomatal complex^c

petal margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025008

has super-classes: phyllome margin^c; part_of^op some petal^c

petal mesophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006071

has super-classes: petal parenchyma^c; mesophyll^c

petal parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006069

has super-classes: parenchyma^c; part_of^op some petal^c
has sub-classes: petal mesophyll^c

petal primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000021

has super-classes: phyllome primordium^c; floral organ primordium^c; develops_from^op some petal anlagen^c

petal primordium visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007608

has super-classes: corolla development stage^c

petal spur^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025511

Often contains nectar. Use this term if the spur is part of a single petal. If the spur is part two or more fused petals, use corolla spur (PO:0025512).

has super-classes: cardinal organ part^c; part_of^op some petal^c

petal stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025218

has super-classes: petal epidermis^c; phyllome stomatal complex^c

petal tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025149

This term is to be used for only the apical most portion of a petal. For a larger area, use the term petal apex. Use this term when describing the shape of a petal tip.

has super-classes: phyllome tip^c; part_of^op some petal apex^c

petal trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025187

has super-classes: phyllome trichome^c; part_of^op some petal epidermis^c

petal vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000054

has super-classes: phyllome vascular system^c; part_of^op some petal^c; part_of^op some flower vascular system^c

petiole^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020038

has super-classes: stalk^c; part_of^op some vascular leaf^c
has sub-classes: spine petiole^c

petiole abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008029

has super-classes: petiole epidermis^c

petiole adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008027

has super-classes: petiole epidermis^c

petiole canal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025133

May occur on the surface or be internal.

has super-classes: canal^c; part_of^op some petiole^c
has sub-classes: abaxial petiole canal^c, adaxial petiole canal^c

petiole cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000053

has super-classes: cortex^c; part_of^op some petiole^c

petiole distal end^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008026

has super-classes: cardinal organ part^c; part_of^op some petiole^c

petiole epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000051

is equivalent to: leaf epidermis^c and (part_of^op some petiole^c)
has super-classes: leaf epidermis^c; part_of^op some petiole^c
has sub-classes: petiole abaxial epidermis^c, petiole adaxial epidermis^c, petiole stomatal complex^c

petiole lamina^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025129

The entire petiole may be laminar, or the petiole may be more or less rounded in cross section with laminar extensions.

is equivalent to: lamina^c and (part_of^op some petiole^c)
has super-classes: phyllome lamina^c; part_of^op some petiole^c

petiole margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025010

Petiole margins may be found in flattened (laminar) petioles, but may also occur in laminar extensions of petioles that are rounded or c-shaped in cross section.

has super-classes: cardinal organ part^c; part_of^op some petiole lamina^c

petiole parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006066

has super-classes: parenchyma^c; part_of^op some petiole^c

petiole proximal end^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008024

has super-classes: cardinal organ part^c; part_of^op some petiole^c

petiole pulvinus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009111

has super-classes: pulvinus^c; part_of^op some petiole^c

petiole stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025189

has super-classes: petiole epidermis^c; leaf stomatal complex^c

petiole vascular bundle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025434

has super-classes: vascular bundle^c

petiole vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000052

has super-classes: vascular system^c; part_of^op some petiole^c; part_of^op some leaf vascular system^c

petiolule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020050

has super-classes: stalk^c; part_of^op some leaflet^c

phellem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004003

Protective in function because the walls are highly impervious to water.

has super-classes: portion of ground tissue^c; part_of^op some periderm^c; develops_from^op some cork cambium^c

phelloderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005050

has super-classes: portion of ground tissue^c; develops_from^op some cork cambium^c; part_of^op some periderm^c

phelloid cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004007

Not used in current plant literature. Confusing definition.

phloem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005417

Functions in the conduction of organic substances in vascular plants.

has super-classes: portion of vascular tissue^c
has sub-classes: primary phloem^c, secondary phloem^c, sieve tube^c
is disjoint with: leptome^c

phloem development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025426

has super-classes: vascular tissue development stage^c; has_participant^op some phloem^c

phloem fiber cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004519

is equivalent to: plant fiber cell^c and (part_of^op some phloem^c)
has super-classes: plant fiber cell^c; part_of^op some phloem^c
has sub-classes: septate phloem fiber cell^c

phloem mother cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000400

Phloem islands can be formed in the middle of the xylem.

has super-classes: cambial initial cell^c; part_of^op some secondary phloem^c

phloem pole pericycle cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000065

Phloem pole pericycle cells are cells in the pericycle that are adjacent to the protophloem pole of a vascular bundle. Pericycle cells that are adjacent to other phloem cells in the vascular bundle are not considered phloem pole pericycle cells. Phloem pole pericycle cells are distinct from xylem pole pericycle cells in that they display cytoplasmic characteristics of a more differentiated status.

has super-classes: pericycle cell^c

phloem sap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025540

has super-classes: plant sap^c
has sub-classes: root system phloem sap^c, shoot system phloem sap^c

photosynthetic cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004008

Functional characterization is not part of the criteria.

phyllode leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025335

Common in legumes of the genus Acacia. Similar development occurs in other ensiform leaves in some monocots, but they are not called phyllodes. Transitional leaves also occur, in which the basal portion of the leaf develops similar to a phyllode, but the apical portion of the leaf develops normal leaflets (see PO:0025336, transition phyllode leaf). Phyllodes are generally xeromorphic.

has super-classes: adult vascular leaf^c; ensiform vascular leaf^c

phyllome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006001

has super-classes: b f o 0000004; plant organ^c; part_of^op some shoot system^c; develops_from^op some phyllome primordium^c
has sub-classes: bract^c, leaf^c, lodicule^c, persistent sepal^c, persistent stamen^c, persistent tepal^c, petal^c, prophyll^c, scale leaf^c, sepal^c, sporophyll^c, tepal^c

phyllome abaxial meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025402

Contributes to the thickness of a phyllome (PO:0006001). There are two types of adaxial meristems. In phyllomes with a petiole (PO:0020038) and lamina (PO:0025060), an adaxial rounding meristem occurs later in development, is separated from the apical meristem (PO:0020144), and contributes to the thickness of the petiole and midrib. In unifacial phyllomes, the an adaxial meristem occurs earlier in development, is close to but separate from the apical meristem, and contributes to the thickness and cross-sectional shape of the entire phyllome. If annotating to a leaf, use the more specific term leaf abaxial meristem (PO:0025403).

has super-classes: portion of meristem tissue^c; part_of^op some phyllome^c
has sub-classes: vascular leaf abaxial meristem^c

phyllome adaxial meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025400

has super-classes: portion of meristem tissue^c; part_of^op some phyllome^c
has sub-classes: vascular leaf adaxial meristem^c

phyllome anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025430

The phyllome anlagen is only detectable by gene expression, not morphology.

has super-classes: portion of meristem tissue^c; part_of^op some peripheral zone^c
has sub-classes: bract anlagen^c, carpel anlagen^c, cotyledon anlagen^c, lodicule anlagen^c, petal anlagen^c, sepal anlagen^c, stamen anlagen^c, vascular leaf anlagen^c

phyllome apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025139

It is not precisely defined how far toward the base from the tip a phyllome apex extends. For the apical most portion of a phyllome, use the term phyllome tip.

has super-classes: cardinal organ part^c; part_of^op some phyllome^c
has sub-classes: bract apex^c, leaf apex^c, petal apex^c, sepal apex^c, tepal apex^c

phyllome base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025140

has super-classes: cardinal organ part^c; part_of^op some phyllome^c
has sub-classes: bract base^c, leaf base^c, petal base^c, sepal base^c, tepal base^c

phyllome development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025579

has super-classes: plant organ development stage^c; part_of^op some shoot system development stage^c
has sub-classes: leaf development stage^c, lemma development stage^c, lodicule development stage^c, palea development stage^c

phyllome epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025157

is equivalent to: shoot system epidermis^c and (part_of^op some phyllome^c)
has super-classes: shoot system epidermis^c; part_of^op some phyllome^c
has sub-classes: bract epidermis^c, carpel epidermis^c, leaf epidermis^c, petal epidermis^c, phyllome stomatal complex^c, sepal epidermis^c, stamen epidermis^c, tepal epidermis^c

phyllome founder cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025586

As a group, the phyllome founder cells encompass several layers of the shoot apical meristem (PO:0020148) and form a phyllome anlagen (PO:0025430). Founder cells do not function as stem cells but rather have a determinate fate and can be defined by histological, clonal and molecular criteria.

has super-classes: native plant cell^c; part_of^op some phyllome anlagen^c
has sub-classes: vascular leaf founder cell^c

phyllome guard cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025236

has super-classes: guard cell^c; part_of^op some phyllome stomatal complex^c
has sub-classes: leaf guard cell^c

phyllome lamina^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025396

is equivalent to: plant organ lamina^c and (part_of^op some phyllome^c)
has super-classes: plant organ lamina^c; part_of^op some phyllome^c
has sub-classes: leaf lamina^c, petiole lamina^c

phyllome lamina areole^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025391

Any order of phyllome lamina vein can form the sides of a phyllome lamina areole. Taken together, the phyllome lamina areoles form a contiguous field of polygons over the area of a phyllome lamina.

has super-classes: cardinal organ part^c; part_of^op some phyllome lamina^c
has sub-classes: leaf lamina areole^c

phyllome lamina crena^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025516

See phyllome lamina tooth (PO:0025515) for a small angular projection. The corresponding phyllome sinus may be rounded or angular.

has super-classes: cardinal organ part^c; part_of^op some phyllome lamina^c
has sub-classes: leaf lamina crena^c

phyllome lamina lobe^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025514

A phyllome lobe may be either rounded or angular at the tip, and may have phyllome teeth (PO:0025515) or phyllome crenae (PO:0025516) on its margin. The corresponding phyllome sinus may be rounded or angular.

has super-classes: cardinal organ part^c; part_of^op some phyllome lamina^c
has sub-classes: leaf lamina lobe^c

phyllome lamina tooth^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025515

See phyllome lamina crena (PO:0025516) for a small rounded projection. The corresponding phyllome sinus may be rounded or angular.

has super-classes: cardinal organ part^c; part_of^op some phyllome lamina^c
has sub-classes: leaf lamina tooth^c

phyllome lamina vein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025348

is equivalent to: vascular bundle^c and (part_of^op some phyllome lamina^c)
has super-classes: vascular bundle^c; part_of^op some phyllome lamina^c
has sub-classes: leaf lamina vein^c

phyllome margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025018

is equivalent to: plant organ margin^c and (part_of^op some phyllome lamina^c)
has super-classes: plant organ margin^c; part_of^op some phyllome lamina^c
has sub-classes: bract margin^c, leaf margin^c, petal margin^c, prophyll margin^c, scale leaf margin^c, sepal margin^c, sporophyll margin^c, tepal margin^c

phyllome marginal meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025404

Phyllome marginal meristems may develop on the lateral margins of a phyllome after the transition from a phyllome primordium (PO:0025128) and may contribute to expansion of the phyllome lamina (PO:0025396). Marginal growth can occur in a phyllome primordium, but it is not considered part of a phyllome marginal meristem. Phyllome marginal initials may give rise to phyllome epidermis (PO:0025157) while phyllome submarginal initials may give rise to the mesophyll (PO:0006070). May be of limited duration.

has super-classes: portion of meristem tissue^c; part_of^op some phyllome margin^c
has sub-classes: leaf marginal meristem^c

phyllome plate meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025428

The activity of a phyllome plate meristem results in increase in the surface area, but not thickness of a phyllome.

has super-classes: portion of meristem tissue^c; part_of^op some phyllome^c
has sub-classes: leaf plate meristem^c

phyllome primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025128

The transition from phyllome primordium to phyllome occurs when the first non-meristematic tissue develops begins to develop.

has super-classes: b f o 0000004; primordium^c; develops_from^op some phyllome anlagen^c; part_of^op some shoot axis apex^c
has sub-classes: bract primordium^c, carpel primordium^c, cotyledon primordium^c, lodicule primordium^c, petal primordium^c, sepal primordium^c, stamen primordium^c, vascular leaf primordium^c, vascular leaf primordium abaxial side^c, vascular leaf primordium adaxial side^c

phyllome sinus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025383

Can be angular or rounded.

has super-classes: plant anatomical space^c; part_of^op some phyllome margin^c
has sub-classes: leaf sinus^c

phyllome stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025215

has super-classes: stomatal complex^c; phyllome epidermis^c
has sub-classes: bract stomatal complex^c, carpel stomatal complex^c, leaf stomatal complex^c, petal stomatal complex^c, sepal stomatal complex^c, stamen stomatal complex^c, tepal stomatal complex^c

phyllome stomatal pore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025234

has super-classes: stomatal pore^c; part_of^op some phyllome stomatal complex^c
has sub-classes: leaf stomatal pore^c

phyllome substomatal cavity^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025398

has super-classes: substomatal cavity^c; part_of^op some phyllome^c; adjacent_to^op some phyllome stomatal pore^c
has sub-classes: leaf substomatal cavity^c

phyllome tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025141

This term is to be used for only the apical most portion of a phyllome. For a larger area, use the term phyllome apex. Use this term when describing the shape of a phyllome tip.

has super-classes: cardinal organ part^c; part_of^op some phyllome apex^c
has sub-classes: bract tip^c, leaf tip^c, petal tip^c, sepal tip^c, tepal tip^c

phyllome trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025186

has super-classes: trichome^c
has sub-classes: bract trichome^c, carpel trichome^c, leaf trichome^c, petal trichome^c, sepal trichome^c, stamen trichome^c, tepal trichome^c

phyllome vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025206

has super-classes: vascular system^c; part_of^op some phyllome^c; part_of^op some shoot system vascular system^c
has sub-classes: anther vascular system^c, carpel vascular system^c, leaf vascular system^c, petal vascular system^c, sepal vascular system^c, stamen vascular system^c, tepal vascular system^c

pinnate leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020045

The total number of leaflets may be even or odd, in which case the leaf is called even-pinnate or odd-pinnate respectively.

has super-classes: compound leaf^c

pistillate flower^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025599

has super-classes: flower^c
has sub-classes: ear floret^c, ray flower^c

pistillate inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025598

has super-classes: inflorescence^c; has_part^op some pistillate flower^c
has sub-classes: ear inflorescence^c

pistillode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009078

has super-classes: gynoecium^c

pith^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006109

has super-classes: parenchyma^c
has sub-classes: receptacle pith^c, root pith^c, shoot axis pith^c, tuber pith^c

placenta^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025078

The transfer cells aid in nutrient transport. Examples include ovary placenta (PO:0020001) and fruit placenta (PO:0004535).

has super-classes: portion of plant tissue^c
has sub-classes: plant ovary placenta^c

placentoid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020005

has super-classes: parenchyma^c; part_of^op some connective^c

plant anatomical entity^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025131

Includes both material entities such as plant structures and immaterial entities such as plant anatomical spaces. CARO:0000000 'anatomical entity' is defined as: A part of a cellular organism that is either an immaterial entity or a material entity with granularity aboove the level of a protein complex. Or, a substance produced by a cellular organism with granularity above the level of a protein complex. Refers to BFO:0000004 'independent continuant'.

has super-classes: only_in_taxon^op some n c b i taxon 33090^c
has sub-classes: plant anatomical space^c, plant structure^c, portion of plant substance^c

plant anatomical space^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025117

CARO:0000005 'anatomical space' is defined as: An immaterial anatomical entity of three dimensions, that is generated by morphogenetic or other physiologic processes, and is bounded by an anatomical surface.

has super-classes: plant anatomical entity^c
has sub-classes: anther pore^c, axil^c, canal^c, hydathode pore^c, intercellular space^c, locule^c, phyllome sinus^c, plant ovule micropyle^c, seed micropyle^c, spore capsule mouth^c, stomatal pore^c, stomium^c

plant axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025004

Includes roots and shoots.

has super-classes: plant organ^c
has sub-classes: plant embryo axis^c, root^c, shoot axis^c, tuber^c

plant axis differentiation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025119

Primary, not secondary, tissue differentiation occurs in a differentiation zone.

has super-classes: cardinal organ part^c; part_of^op some plant axis^c
has sub-classes: root differentiation zone^c, shoot internode differentiation zone^c

plant axis elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025180

has super-classes: cardinal organ part^c; part_of^op some plant axis^c
has sub-classes: root elongation zone^c, shoot axis internode elongation zone^c

plant callus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005052

Consists primarily of parenchyma cells but may contain other cell types as the callus begins to differentiate. May be formed as a result of wounding or may develop in culture.

has super-classes: portion of plant tissue^c
has sub-classes: cultured plant callus^c

plant cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009002

Applies to cells that are living or dead at maturity (e.g., fiber cell or tracheid) and includes any external encapsulating structures (if present) such as the plasma membrane and the plant-type cell wall. Definition of cell GO:0005623: "The basic structural and functional unit of all organisms. Includes the plasma membrane and any external encapsulating structures such as the cell wall and cell envelope". GO:0009505. Definition of plant-type cell wall (GO:0009505): A more or less rigid structure lying outside the cell membrane of a cell and composed of cellulose and pectin and other organic and inorganic substances, synonym; exact: cellulose and pectin-containing cell wall.

has super-classes: plant structure^c
has sub-classes: cultured plant cell^c, native plant cell^c
is disjoint with: vascular system^c, portion of plant tissue^c, plant organ^c, cardinal organ part^c, collective plant organ structure^c, collective organ part structure^c

plant cuticle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000022

The plant cuticle is produced in and secreted by epidermal cells (PO:0004013) of leaves (PO:0025034), stems (PO:0009047), fruits (PO:0009001), and other aerial plant structures. It has as parts an inner cuticle proper (PO:0025387) and an outer layer of epicuticular wax (PO:0025388).

has super-classes: b f o 0000004; portion of plant substance^c; adjacent_to^op some epidermis^c
has sub-classes: plant cuticle ridge^c

plant cuticle proper^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025387

has super-classes: portion of plant substance^c

plant cuticle ridge^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025536

has super-classes: plant cuticle^c

plant egg cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020094

The plant egg cell (megagamete) is usually larger than the plant sperm cell (PO:0000084; microgamete).

has super-classes: plant gamete^c
has sub-classes: archegonium egg cell^c, embryo sac egg cell^c

plant embryo^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009009

A plant embryo is generally formed after the first division of a plant zygote (PO:0000423), but in the case of a nucellar (adventitious) plant embryo (PO:0004537), somatic plant embryo (PO:0025302), microspore-derived cultured plant embryo (PO:0025305), and other embryos that arise through apogamy, it begins after the division of a single cell that is not a zygote. The end of the embryo stage varies among taxa; the beginning of a seed germination stage (PO:0007057) in seed plants, formation of the first vascular leaf (PO:0009025) in pteridophytes, the beginning of development of a sporangium (PO:0025094) in bryophytes, or the beginning of the formation of a plant organ (PO:0009008) such as a root (PO:0009005), shoot axis (PO:0025029), or vascular leaf (PO:0009025) in a cultured plant embryo (PO:0000010).

has super-classes: whole plant^c
has sub-classes: cultured plant embryo^c, somatic plant embryo^c, zygotic plant embryo^c

plant embryo axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0019018

Has as parts a hypocotyl, a root meristem and a radicle, if any of these are present.

has super-classes: plant axis^c; embryo plant structure^c

plant embryo bilateral stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004507

A plant embryo bilateral stage is commonly known as the heart stage in dicotyledonous plants and the transition stage in monocots. Preceded by a plant embryo globular stage (PO:0001185).

has super-classes: plant embryo development stage^c; preceded_by^op some plant embryo globular stage^c

plant embryo coleoptilar stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001094

This stage occurs in grasses and other monocots.

has super-classes: plant embryo development stage^c; precedes^op some mature plant embryo stage^c; preceded_by^op some plant embryo bilateral stage^c

plant embryo coleoptile^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025286

has super-classes: coleoptile^c; embryo plant structure^c

plant embryo cotyledon^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025470

has super-classes: cotyledon^c

plant embryo cotyledonary stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001078

During this stage, the plant embryo (PO:0009009) continues to undergo a process of developmental growth (as a result of both cell division (GO:0051301) and cell expansion (GO:0016049), which ends with the onset of a mature plant embryo stage (PO:0001081). For species that develop true leaves in the plant embryo, (vascular leaves (PO:0009025) that develop after the cotyledons (PO:0020030) or coleoptile (PO:0020033)), growth may continue in the plant embryo true leaf formation stage (PO:0001095). For other species, the plant embryo transitions directly from a plant embryo cotyledonary stage (PO:0001078) to a mature plant embryo stage (PO:0001081).

has super-classes: plant embryo development stage^c; preceded_by^op some plant embryo bilateral stage^c; precedes^op some mature plant embryo stage^c

plant embryo development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007631

The plant embryo stage generally starts after the first division of a plant zygote (PO:0000423), but in the case of a nucellar (adventitious) plant embryo (PO:0004537), somatic plant embryo (PO:0025302), microspore-derived cultured plant embryo (PO:0025305), and other embryos that arise through apogamy, it begins after the division of a single cell that is not a zygote. The end of the embryo stage varies among taxa. No plant species undergoes all of the sub-stages of plant embryo development stage listed here.

has super-classes: sporophyte vegetative stage^c
has sub-classes: mature plant embryo stage^c, plant embryo bilateral stage^c, plant embryo coleoptilar stage^c, plant embryo cotyledonary stage^c, plant embryo globular stage^c, plant embryo true leaf formation stage^c, plant proembryo stage^c

plant embryo dormant stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025377

During a plant embryo dormant stage, a plant embryo participates in a dormancy process, but not all plant embryos have a dormant stage. A dormancy process (GO:0022611) is a developmental process in which dormancy (sometimes called a dormant state) is induced, maintained or broken. Dormancy is a suspension of most physiological activity and growth that can be reactivated. In seed plants, a plant embryo dormant stage may be part of a seed dormant stage.

has super-classes: mature plant embryo stage^c; sporophyte dormant stage^c; has_participant^op some plant embryo^c

plant embryo globular stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001185

During the plant embryo globular stage, differentiation of the three main tissue systems (vascular system (PO:0000034); epidermis (PO:0005679); and the portion of ground tissue (PO:0025059)) occurs.

has super-classes: plant embryo development stage^c; preceded_by^op some plant proembryo stage^c

plant embryo proper^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000001

The embryo proper is the entire embryo exclusive of the suspensor.

has super-classes: embryo plant structure^c

plant embryo radicle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025296

May eventually develop into the root system (PO:0025025) of an adult plant. Sometimes is abortive.

has super-classes: radicle^c; embryo plant structure^c

plant embryo true leaf formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001095

A true leaf is vascular leaf (PO:0009025) that forms after the formation of the cotyledons (PO:0020030) or a coleoptile (PO:0020033). Not all species form true leaves in the plant embryo development stage (PO:0007631). If it occurs, a plant embryo true leaf formation stage is preceded by either a plant embryo cotyledonary stage (PO:0001078) or a plant embryo coleoptilar stage (PO:0001094), depending upon the species.

has super-classes: plant embryo development stage^c; precedes^op some mature plant embryo stage^c

plant embryo vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008011

has super-classes: vascular system^c; portion of embryo plant tissue^c

plant fiber cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025407

May or may not have lignin in the secondary cell wall (GO:0009531) or a living protoplast at maturity. It may be difficult to distinguish fiber cells from tracheary elements (PO:0000290). Compare with sclerid cells (PO:0025418), which are usually not elongated.

has super-classes: sclerenchyma cell^c
has sub-classes: phloem fiber cell^c, septate fiber cell^c, xylem fiber cell^c

plant gamete^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025006

has super-classes: native plant cell^c
has sub-classes: plant egg cell^c, plant sperm cell^c

plant life cycle phase^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0028001

The life cycle of all plants is characterized by the alternation of phases (or generations). The sporophytic phase has twice the chromosome complement of the gametophytic phase.

plant ontology^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009075

plant organ^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009008

Examples include stem (PO:0009047), leaf (PO:0025034), and root (PO:0009005). May include individual plant cells (PO:0009002) that are not part of a portion of plant tissue (e.g., idioblasts, PO:0000283). A plant organ may have one or more different plant organs as parts, such as a sporophyll (PO:0009026) that may have as part a sporangium (PO:0025094) or a carpel (PO:0009030) that may have as part a plant ovule (PO:0020003).

has super-classes: multi-tissue plant structure^c
has sub-classes: coleoptile^c, coleorhiza^c, floral organ^c, multicellular plant gametangium^c, phyllome^c, plant axis^c, plant ovule^c, sporangium^c, sporophyte foot^c
is disjoint with: vascular system^c, plant cell^c, portion of plant tissue^c

plant organ development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025339

Includes development stages for leaves and roots.

has super-classes: multi-tissue plant structure development stage^c
has sub-classes: floral organ formation stage^c, phyllome development stage^c, root development stage^c

plant organ lamina^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025513

is equivalent to: lamina^c and (part_of^op some plant organ^c)
has super-classes: cardinal organ part^c; lamina^c
has sub-classes: phyllome lamina^c

plant organ margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025005

Only flattened or laminar plant organs or organ parts will have a margin.

has super-classes: cardinal organ part^c; part_of^op some plant organ lamina^c
has sub-classes: phyllome margin^c

plant ovary^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009072

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: plant structure^c; part_of^op some carpel^c; only_in_taxon^op some n c b i taxon 3398^c

plant ovary epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006063

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

is equivalent to: epidermis^c and (part_of^op some plant ovary wall^c)
has super-classes: carpel epidermis^c; part_of^op some plant ovary wall^c
has sub-classes: plant ovary inner epidermis^c, plant ovary outer epidermis^c

plant ovary inner epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005024

has super-classes: plant ovary epidermis^c

plant ovary locule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025266

Generally contains at least one ovule. An ovary locule may be part of a single carpel, in the case of unicarpellate flowers. An ovary that is part of a syncarpous gynoecium may have multiple locules, or the anatomical spaces of multiple carpels may be fused to form a single locule.

has super-classes: locule^c; part_of^op some plant ovary^c

plant ovary outer epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005023

has super-classes: plant ovary epidermis^c

plant ovary ovule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025490

Found in angiosperms.

has super-classes: plant ovule^c; floral organ^c; part_of^op some plant ovary^c

plant ovary placenta^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020001

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: placenta^c; part_of^op some plant ovary^c
has sub-classes: fruit placenta^c, plant ovary replum^c

plant ovary replum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025272

An ovary replum develops along with the ovary and has no suture line in its center, while a true ovary septum (PO:0025262) is derived from the fusion two adjacent ovary walls. Common in Brassicaceae. Annotations for Arabidopsis should go here, and not under ovary septum.

has super-classes: plant ovary placenta^c

plant ovary septum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025262

Found in species with syncarpous gynoecia (fused carpels). A plant ovary septum is derived from the fused walls of two adjacent carpels, while a replum (PO:0005016) develops from early contact of placental tissue from opposite sides of the plant ovary. Annotations for Arabidopsis should go under replum, not under plant ovary septum.

has super-classes: b f o 0000004; septum^c; part_of^op some gynoecium^c; develops_from^op some plant ovary wall^c

plant ovary wall^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005022

has super-classes: portion of plant tissue^c; part_of^op some plant ovary^c

plant ovary wall middle layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005025

In some species, such as Arabidopsis, there may be a distinct subepidermal adaxial cell layer. The cells in the mesophyll layer(s) may not differentiate similar to the spongy and palisade cells found in the leaf mesophyll.

has super-classes: chlorenchyma^c; part_of^op some plant ovary wall^c

plant ovule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020003

A seed (PO:0009010) develops from a plant ovule. In angiosperms, a plant ovule is part of a plant ovary (PO:0009072). In conifers, a plant ovule is part of an ovuliferous scale (add term). If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: b f o 0000004; plant organ^c; develops_from^op some ovule primordium^c
has sub-classes: ovuliferous scale ovule^c, plant ovary ovule^c

plant ovule micropyle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020025

The micropyle originates as an opening in the integuments of an ovule through which the pollen tube usually enters the embryo sac. In a mature seed the micropyle may remain visible as an occluded pore or may be obliterated. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: plant anatomical space^c; part_of^op some integument^c

plant proembryo stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001180

In the case of a nucellar (adventitious) plant embryo (PO:0004537), somatic plant embryo (PO:0025302), microspore-derived cultured plant embryo (PO:0025305), or other embryos that arise through apogamy, the plant proembryo stage (PO:0001180) begins after the division of a single cell that is not a zygote. The plant proembryo stage occurs prior to the differentiation of the three main tissue systems (vascular system (PO:0000034) epidermis (PO:0005679); and the portion of ground tissue (PO:0025059)).

has super-classes: plant embryo development stage^c

plant protoplast^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000006

The cell wall is generally removed using polysaccharide-degrading enzymes such as cellulase, pectinase and /or xylanase. The cultured plant cell may be in suspension culture or from callus culture on solid media.

has super-classes: cultured plant cell^c

plant resin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025603

Plant resins are often produced by Gymnosperms but not restricted to those plants. In the conifers, plant resins are constitutively and inducibly produced through the secretory activity of resin cells (PO:0025604), and can be exuded through a resin canal (PO:0005665) to a site of injury or predator attack.

has super-classes: portion of plant substance^c

plant sap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025538

Plant sap should not be confused with latex, resins or plant cell cytoplasm.

has super-classes: portion of plant substance^c
has sub-classes: phloem sap^c, xylem sap^c

plant sperm cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000084

The sperm cell is usually smaller than the egg cell. Male gametes may be defined as the motile gamete, rather than the smaller gamete. Plant sperm cells lack a cell wall.

has super-classes: b f o 0000004; plant gamete^c; develops_from^op some spermatogenous cell^c
has sub-classes: antheridium sperm cell^c, pollen sperm cell^c

plant spore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025017

A spore is usually single-celled in homosporous plants but may be multicellular in heterosporous plants. May have a spore wall (GO:0031160) made of sporopollenin.

has super-classes: whole plant^c
has sub-classes: megaspore^c, microspore^c

plant spore dormant stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025376

has super-classes: gametophyte dormant stage^c; plant spore stage^c

plant spore stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025375

Includes the stage when a megaspore is present before it develops into a megagametophyte or embryo sac and the stage when a microspore is present before it develops into a microgametophyte or pollen. There may be cell division in a spore before it germinates.

is equivalent to: gametophyte development stage^c and (has_participant^op some plant spore^c)
has super-classes: gametophyte development stage^c; has_participant^op some plant spore^c
has sub-classes: plant spore dormant stage^c

plant structure^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009011

'Part' includes both proper parts and the whole plant. CARO:0000003 'connected anatomical structure' is defined as: Material anatomical entity that is a single connected structure with inherent 3D shape, generated by coordinated expression of the organism's own genome.

has super-classes: plant anatomical entity^c
has sub-classes: cardinal part of multi-tissue plant structure^c, collective plant structure^c, embryo plant structure^c, in vitro plant structure^c, multi-tissue plant structure^c, plant cell^c, plant ovary^c, portion of plant tissue^c, rhizoid^c, trichome^c, trichome apex^c, trichome tip^c, whole plant^c

plant structure development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009012

Refers to GO:0032502 'developmental process', which includes growth, differentiation, and senescence, and BFO:0000003 'ocurrent'.

has sub-classes: collective plant organ structure development stage^c, multi-tissue plant structure development stage^c, plant tissue development stage^c, trichome development stage^c, whole plant development stage^c

plant tissue development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025423

has super-classes: b f o 0000003; plant structure development stage^c; has_participant^op some portion of plant tissue^c
has sub-classes: vascular tissue development stage^c

plant zygote^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000423

A plant zygote is a whole plant that is a single cell formed by fertilization (syngamy).

has super-classes: b f o 0000002; native plant cell^c; participates_in^op some plant zygote stage^c

plant zygote stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001097

Precedes the sporophyte vegetative stage (PO:0007134). Refers to the GO biological process term fertilization (GO:0009566).

has super-classes: sporophyte development stage^c

plerome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008035

has super-classes: portion of meristem tissue^c

plumule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020032

Occurs in several embryo types.

has super-classes: shoot axis apex^c; embryo plant structure^c

pneumatophore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025357

Pneumatophores are found in trees that live in flooded habitats such as mangroves, and often have many lenticels (PO:0000031) which may provide oxygen to below-ground roots growing in flooded soils. Knee roots are a type of pneumatophore in which the lateral root first grows upward, then turns and grows back down into the substrate, forming a knee-like bend. Note that a pneumatophore differs from a prop root (PO:0000044), which is formed at a stem node above the ground, and grows downward into the soil.

has super-classes: lateral root^c

pneumatorhiza^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025358

Found in some palms and other species growing in flooded habitats. Pneumatorhiza appear as small outgrowths on the surface of a prop root. Similar, but distinct from, pneumatophores.

has super-classes: lateral root^c

polar nucleus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020095

Comment: this term is now available in the cellular_component aspect of the Gene Ontology (GO:0043078).

pollen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025281

has super-classes: b f o 0000040; microgametophyte^c; located_in^op some pollen sac^c; develops_from^op some microspore^c

pollen development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001007

has super-classes: microgametophyte development stage^c; part_of^op some androecium development stage^c
has sub-classes: A microsporogenous mass stage^c, B enlarged microsporocyte stage^c, C callose wall formation in pollen mother cells stage^c, D pollen mother cell meiosis stage^c, E tetrad stage^c, F microspore release stage^c, G early unicellular microspore stage^c, H late unicellular microspore stage^c, I first mitotic division stage^c, J bicellular pollen stage^c, K second mitotic division stage^c, L mature pollen stage^c, M germinated pollen stage^c

pollen sac^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025277

A pollen sac is a microsporangium in seed plants. In angiosperms, a single, unfused pollen sac may contain an anther locule or several pollen sacs may fuse so they contain a single anther locule. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: microsporangium^c; part_of^op some microsporophyll^c

pollen sperm cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025121

Pollen sperm cells are structurally simple, usually non-motile cells that may contain a normal complement of cellular organelles, including heritable cytoplasmic organelles such as mitochondria and, in some plants, plastids, but lack a cell wall. In seed plants, pollen sperm cells are usually two in number. In angiosperms, during double fertilization, one fuses with the plant egg cell (PO:0020094) to produce a plant zygote (PO:0000423) while another fuses with the two polar nuclei of the embryo sac central cell (PO:0020090) to give rise to endosperm (PO:0009089). In angiosperms, the pollen sperm cell arises from the generative cell (PO:0020097). In gymnosperms, the pollen sperm cell arises from the body cell (PO:0025525).

has super-classes: plant sperm cell^c; part_of^op some pollen^c; develops_from^op some body cell^c; develops_from^op some generative cell^c

pollen tube^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006345

This term was made obsolete because it is a subcellular component. See GO for the term pollen tube (GO:0090406). Since a pollen tube is part_of a pollen tube cell, annotations for pollen tube may also go to the more general term pollen tube cell (PO:0025195).

pollen tube cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025195

Carries the male gametes (PO:0025006) into or near the plant ovule (PO:0020003). May be branched in gymnosperms. See GO for pollen tube (GO:0090406) or pollen tube tip (GO:0090404).

has super-classes: b f o 0000004; native plant cell^c; develops_from^op some microgametophyte vegetative cell^c

pollen tube tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000028

This term was made obsolete because it is a subcellular component. See GO for the term pollen tube tip (GO:0090404). Since a pollen tube tip is part_of a pollen tube, which is part of a pollen cell, annotations for pollen tube tip may also go to the more general term pollen tube cell (PO:0025195).

pollen wall^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020059

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043667.

pollen wall columella^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020014

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043674.

polyarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025563

has super-classes: root system exarch protoxylem^c

pome fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030110

A pome fruit (PO:0030110) is a specialized type of berry fruit (PO:0030108) which is encapsuled in persistent, accrescent receptacle (PO:0009064) and/or hypanthium (PO:0009065) tissue. Examples: Apple, crab apple, and pear (Malus spp. and Pyrus spp.)

has super-classes: berry fruit^c

poricidal capsule fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030095

Example: poppy (Papaver spp.).

has super-classes: capsule fruit^c

portion of embryo plant tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025233

This class is for tissues that only occur as part of an embryo.

is equivalent to: portion of plant tissue^c and (part_of^op some plant embryo^c)
has super-classes: portion of plant tissue^c; embryo plant structure^c
has sub-classes: cotyledon anlagen^c, embryo cortex^c, embryo endodermis^c, embryo shoot apical meristem^c, hypocotyl vascular system^c, plant embryo vascular system^c, scutellar epithelium^c, scutellum epidermis^c, scutellum vascular system^c

portion of ground tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025059

Develops from the ground meristem (PO:0025594).

has super-classes: b f o 0000004; portion of plant tissue^c; develops_from^op some ground meristem^c
has sub-classes: anther wall middle layer^c, anther wall primary parietal cell layer^c, anther wall secondary parietal cell layer^c, bundle sheath^c, bundle sheath extension^c, collenchyma^c, cortex^c, endodermis^c, hypodermis^c, interfascicular region^c, parenchyma^c, pericycle^c, periderm^c, phellem^c, phelloderm^c, portion of transmitting tissue^c, protosporangium endothecium^c, sclerenchyma^c, sporangium wall endothecium^c, stereome^c, tapetum^c

portion of meristem tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009013

has super-classes: portion of plant tissue^c; has_part^op some meristematic cell^c
has sub-classes: apical meristem^c, central zone^c, ground meristem^c, inflorescence meristem^c, lateral meristem^c, leaf collar^c, meristem L1 layer^c, meristem L2 layer^c, meristem L3 layer^c, periblem^c, peripheral zone^c, phyllome abaxial meristem^c, phyllome adaxial meristem^c, phyllome anlagen^c, phyllome marginal meristem^c, phyllome plate meristem^c, plerome^c, primordium^c, procambium^c, protoderm^c, quiescent center^c, rib zone^c, root anlagen^c, root meristem^c, shoot system meristem^c

portion of plant substance^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025161

Refers to organism substance (CARO:0000004) which is defined as: Material anatomical entity in a gaseous, liquid, semisolid or solid state; produced by anatomical structures or derived from inhaled and ingested substances that have been modified by anatomical structures as they pass through the body and that does not have inherent 3D shape generated by coordinated expression of the organism's own genome. For plants, the word "body" refers to a whole plant, or part thereof. Includes substances such as latex, xylem sap, phloem sap, resin, mucilage, oil, cuticle, cutin, and sporopollenin.

has super-classes: plant anatomical entity^c
has sub-classes: cuticular wax^c, cutin^c, plant cuticle^c, plant cuticle proper^c, plant resin^c, plant sap^c

portion of plant tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009007

A portion of plant tissue may contain one or several types of cells that are organized in a specific spatial arrangement into a structural unit (which includes a mass of callus) and may include an intercellular matrix. May include other types of isolated cells, such as idioblasts.

has super-classes: plant structure^c
has sub-classes: abaxial nucellar projection^c, abscission zone^c, adaxial nucellar projection^c, aleurone layer^c, amphithecium^c, antheridium jacket layer^c, archesporium^c, axillary hair base^c, bark^c, basal endosperm transfer layer^c, central endosperm^c, central strand^c, chalaza^c, chalazal cyst^c, columella^c, costa^c, dehiscence zone^c, endocarp^c, endosperm^c, endothelium^c, epiblast^c, epidermis^c, exocarp^c, gemma^c, hydrome^c, integument^c, juice sac tissue^c, leptome^c, mesocarp^c, micropylar endosperm^c, multicellular trichome^c, multicellular trichome tip^c, nucellar projection^c, obturator^c, pericarp^c, perisperm^c, placenta^c, plant callus^c, plant ovary wall^c, portion of embryo plant tissue^c, portion of ground tissue^c, portion of meristem tissue^c, portion of secretory tissue^c, portion of transfusion tissue^c, portion of vascular tissue^c, protective layer^c, seed chalaza^c, seed coat^c, seed obturator^c, seed operculum^c, separation layer^c, shoot axis tegument layer^c, tegmen^c, testa^c, tetrad of megaspores^c, tetrad of microspores^c, tmema^c
is disjoint with: plant cell^c, plant organ^c, cardinal organ part^c, collective plant organ structure^c, collective organ part structure^c

portion of secretory tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005656

The synonym gland does not imply non-secretory 'glands'.

has super-classes: portion of plant tissue^c
has sub-classes: articulated laticifer^c, nectary^c, oil gland^c, salt gland^c

portion of transfusion tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006084

Found generally in gymnosperm leaves.

has super-classes: portion of plant tissue^c

portion of transmitting tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020102

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: portion of ground tissue^c; part_of^op some style^c

portion of vascular tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009015

Functions in conduction and support. In shoot axes (PO:0025029), vascular tissue is often found as part of a shoot axis stele (PO:0025198) or as scattered vascular bundles (PO:0005020). May include other types of tissues or cells, such as parenchyma (PO:0005421) or fiber cells (PO:0025407).

has super-classes: portion of plant tissue^c
has sub-classes: phloem^c, primary vascular tissue^c, secondary vascular tissue^c, vascular bundle^c, vascular system^c, xylem^c

prickle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025169

Often found on stems and leaves.

has super-classes: epidermis^c
has sub-classes: leaf prickle^c, root prickle^c, shoot axis prickle^c

primary endosperm cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000038

has super-classes: embryo sac cell^c; part_of^op some endosperm^c

primary endosperm cell stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001096

has super-classes: endosperm development stage^c

primary leaf vein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025413

Generally the largest and most prominent of the leaf veins. A leaf may have more than one primary vein. The central primary vein is the midvein (PO:0020139). Vein orders only apply to hierarchically branching vein patterns, not to dichotomously branching vein patterns, as found in some ferns and gymnosperms.

has super-classes: leaf lamina vein^c
has sub-classes: leaf midvein^c

primary parietal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006010

has super-classes: b f o 0000004; native plant cell^c; part_of^op some anther wall primary parietal cell layer^c; develops_from^op some male archesporial cell^c

primary phloem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006075

In stem or root it is differentiated behind the apical meristem. Primary phloem develops as part of primary growth (GO term for primary growth has been requested).

has super-classes: b f o 0000004; phloem^c; develops_from^op some procambium^c
has sub-classes: internal phloem^c, metaphloem^c, protophloem^c

primary phloem sieve cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025454

is equivalent to: sieve cell^c and (part_of^op some primary phloem^c)
has super-classes: sieve cell^c; primary phloem sieve element^c

primary phloem sieve element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025452

is equivalent to: sieve element^c and (part_of^op some primary phloem^c)
has super-classes: sieve element^c; part_of^op some primary phloem^c
has sub-classes: primary phloem sieve cell^c, primary phloem sieve tube element^c

primary phloem sieve tube element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025455

is equivalent to: sieve tube element^c and (part_of^op some primary phloem^c)
has super-classes: sieve tube element^c; primary phloem sieve element^c

primary root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020127

The first root of a plant. In dicots and gymnosperms it becomes the tap root, the central axis of a root system (PO:0025025).

has super-classes: root^c; develops_from^op some seedling radicle^c

primary root apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006081

has super-classes: root apical meristem^c; part_of^op some primary root tip^c

primary root differentiation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003015

has super-classes: root differentiation zone^c; part_of^op some primary root^c

primary root elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025257

has super-classes: root elongation zone^c; part_of^op some primary root tip^c

primary root primordium formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007506

has super-classes: 1 root primordium formation stage^c

primary root tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000026

has super-classes: root tip^c; part_of^op some primary root^c

primary shoot system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006341

has super-classes: shoot system^c

primary sporogenous cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006088

has super-classes: b f o 0000004; native plant cell^c; develops_from^op some male archesporial cell^c

primary thickening meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005039

Contributes to primary thickening of a shoot axis (PO:0025029), adventitious (shoot-borne) root (PO:0000042) formation, and formation of linkages between shot axis (PO:0000039), leaf (PO:0000036), and root (PO:0003011) vascular systems. Contiguous with the shoot apical meristem (PO:0020148) in some species, but not all. Produces more or less distinct vascular bundles (PO:0005020) surrounded by ground tissue (PO:0025059), as opposed to the more or less continuous xylem (PO:0005352) and phloem (PO:0005417) produced by a vascular cambium (PO:0005598). A primary thickening meristem is a multi-layered structure, compared to the single layer of a cambium. Found in many monocotyledons.

has super-classes: b f o 0000004; shoot lateral meristem^c; part_of^op some stem^c; develops_from^op some peripheral zone^c

primary vascular tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025408

Forms as part of primary growth (GO term for primary growth has been requested).

has super-classes: b f o 0000004; portion of vascular tissue^c; develops_from^op some procambium^c

primary xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005849

Primary xylem develops as part of primary growth (request for primary growth has been made to GO) and is not differentiated into axial (PO:0025410) and ray (PO:0025411) systems. Tracheary elements (PO:0000290) have lignified cell walls with secondary thickening and are dead at maturity.

has super-classes: b f o 0000004; xylem^c; develops_from^op some procambium^c
has sub-classes: metaxylem^c, protoxylem^c

primary xylem tracheary element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025444

has super-classes: tracheary element^c; part_of^op some primary xylem^c
has sub-classes: metaxylem tracheary element^c, protoxylem tracheary element^c

primary xylem tracheid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025446

has super-classes: tracheid^c; part_of^op some primary xylem^c
has sub-classes: metaxylem tracheid^c

primary xylem vessel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025450

is equivalent to: xylem vessel^c and (part_of^op some primary xylem^c)
has super-classes: xylem vessel^c; part_of^op some primary xylem^c
has sub-classes: metaxylem vessel^c

primary xylem vessel member^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025448

is equivalent to: xylem vessel member^c and (part_of^op some primary xylem^c)
has super-classes: xylem vessel member^c; part_of^op some primary xylem^c
has sub-classes: metaxylem vessel member^c

primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025127

A primordium appears as a protrusion and is the first distinct form of a plant organ (PO:0009008), cardinal organ part (PO:0025001), or collective plant organ structure (PO:0025007). The transition from a primordium to the plant structure it develops into is marked by the development of non-meristematic cells, although meristematic cells may be present after the transition.

has super-classes: portion of meristem tissue^c
has sub-classes: floral organ primordium^c, leaflet primordium^c, phyllome primordium^c, root primordium^c

procambial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025258

has super-classes: meristematic cell^c; part_of^op some procambium^c
has sub-classes: leaf procambial cell^c

procambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025275

May occur in an apical meristem or in a developing phyllome. Gives rise to the primary xylem and primary phloem. This term replaces PO:0006074.

has super-classes: portion of meristem tissue^c
has sub-classes: root procambium^c, shoot procambium^c

procumbent ray secondary xylem parenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004529

has super-classes: ray secondary xylem parenchyma cell^c

proliferation tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006087

check the definition.

promeristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005752

prop root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000044

This term is perhaps best defined functionally to prop the plant up, but sometimes prop roots may also act as breathing roots. Compare to pneumatophore (PO:0025357), which is a lateral root that grows upwards from below the soil or water surface.

has super-classes: shoot-borne nodal root^c

prophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009042

A prophyll is not classified as a vascular leaf, because it may not have a fully developed vascular system.

has super-classes: phyllome^c
has sub-classes: bracteole^c, perigynium^c, prophyll tendril^c

prophyll margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025013

has super-classes: phyllome margin^c; part_of^op some prophyll^c

prophyll tendril^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025367

Aids plant in climbing. A prophyll may be difficult to distinguish from a branch tendril, because it may be found in the axil of a leaf, but it develops from a prophyll of the axillary bud, rather than a branch. Found in Curburitaceae. See also leaf tendril (PO:0025361), leaflet tendril (PO:0025362), leaf apex tendril (PO:0025363), branch tendril (PO:0025364), stem apex tendril (PO:0025365), and leaf rachis tendril (PO:0025366). Careful observation is required to correctly classify some tendrils.

has super-classes: prophyll^c

protective layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006212

has super-classes: portion of plant tissue^c; part_of^op some abscission zone^c

proteoid root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000067

The terms proteoid root, cluster root, and root cluster have all been used in the literature to describe either the proteoid root axis or clusters of rootlets, and caution should be taken when comparing studies because the definitions of these terms vary (Watts and Evans, 1999; Plant Physiology).

has super-classes: root^c

prothallial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025533

The prothallial cell (PO:0025533) is part of the microgametophyte (PO:0025280) and is believed to be the remnant of the vegetative tissue of the male gametophyte.

has super-classes: native plant cell^c

protoderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006210

A protoderm may or may not arise from independent initial cells (PO:0004011). Some researchers also refer to it as an epidermis in a meristematic state.

has super-classes: portion of meristem tissue^c
has sub-classes: abaxial protoderm^c, adaxial protoderm^c

protonema^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030003

The protonema is the first structure that develops in the gametophytic phase of mosses, some other bryophytes, and leptosporangiate ferns. The term protonema is also used to refer to the phase of development in which protonemal tissue is produced (see PO:0030006 protonema phase). In some species of moss, the protonema is perennial. A protonema may develop from sporophytic tissue during apospory.

has super-classes: chlorenchyma^c; develops_from^op some plant spore^c; participates_in^op some gametophyte development stage^c
has sub-classes: caulonema^c, chloronema^c

protonema meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030046

has super-classes: gametophyte meristematic apical cell^c; part_of^op some protonema^c
has sub-classes: caulonema meristematic apical cell^c, chloronema meristematic apical cell^c

protonema side branch initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030067

May give rise to a chloronema, caulonema, protonema rhizoid, tmema cell, or brachycyte.

has super-classes: protonema sub-apical initial cell^c; part_of^op some protonema^c
has sub-classes: protonemal side branch rhizoid initial cell^c
is disjoint with: root initial cell^c, cambial initial cell^c, epidermal initial cell^c

protonema sub-apical initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030086

May give rise to a branch of the protonema (including a protonema rhizoid, tmema cell or brachycyte), a gametophore bud, or may not divide further.

has super-classes: initial cell^c
has sub-classes: gametophore bud initial cell^c, protonema side branch initial cell^c
is disjoint with: root initial cell^c, cambial initial cell^c, epidermal initial cell^c

protonema whole plant development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030006

The protonema phase ends with the development of gametophores in mosses, some other bryophytes, and leptosporangiate ferns and with the development of a thallus in other bryophytes, although protonema tissue may persist of continue to develop after this.

has super-classes: gametophyte vegetative stage^c

protonemal rhizoid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030079

has super-classes: b f o 0000004; rhizoid^c; develops_from^op some protonemal side branch rhizoid initial cell^c

protonemal side branch rhizoid initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030077

has super-classes: protonema side branch initial cell^c

protophloem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006077

Protophloem is the first primary phloem to develop in any particular location in a portion of vascular tissue (PO:0009015). Sieve elements in the protophloem are smaller than in the metaphloem (PO:0006076). The protophloem usually only lasts a short time before it is replaced by metaphloem.

has super-classes: primary phloem^c

protosporangium endothecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030085

Term used for bryophytes. In liverworts an early sporangium endothecium produces sporogenous tissue. In Sphagnum, Andreaea, and hornworts, it produces columella and sporogenous tissue.

has super-classes: portion of ground tissue^c
is disjoint with: sporangium wall endothecium^c

protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000272

Develops while the vascular tissue (PO:0009015) is still elongating. When protoxylem tracheary elements (PO:0025575) are destroyed they may become obliterated by surrounding parenchyma cells (PO:0000074). Protoxylem has smaller elements than the metaxylem (PO:0000372).

has super-classes: primary xylem^c
has sub-classes: centarch protoxylem^c, endarch protoxylem^c, exarch protoxylem^c, mesarch protoxylem^c

protoxylem tracheary element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025575

In a given portion of primary xylem (PO:0005849), protoxylem tracheary elements are generally smaller in size, fewer in number, un-pitted and have less secondary wall material than metaxylem tracheary elements (PO:0025576).

has super-classes: primary xylem tracheary element^c; part_of^op some protoxylem^c

pseudopodium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030055

Raises the sporophyte above the perichaetial bracts. Found in Sphagnum and Andreaea.

has super-classes: gametophore axis^c

pseudostem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025248

The peduncle later grows up through the pseudostem. Common in Musa species and some other monocots.

has super-classes: collective organ part structure^c

pulvinus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009000

Often glandular. Often involved in movement of a plant structure in response to touch, gravity or light. In panicoid grasses a swollen region in the stem above the intercalary meristem. Such a definition would also include stems of Chloranthaceae, Acanthaceae, Caryophyllaceae, Amaranthaceae, etc. [source: APweb:Glossary].

has super-classes: cardinal organ part^c; part_of^op some shoot system^c
has sub-classes: inflorescence branch pulvinus^c, leaf sheath pulvinus^c, petiole pulvinus^c

pyrene^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020084

quaternary leaf vein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008022

Vein orders only apply to hierarchically branching vein patterns, not to dichotomously branching vein patterns, as found in some ferns and gymnosperms.

has super-classes: leaf lamina vein^c

quiescent center^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020149

If a root cap is present, the quiescent center is behind the root cap.

has super-classes: portion of meristem tissue^c; part_of^op some root apical meristem^c

raceme inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030115

Examples include mouse-ear cress (Arabidopsis thaliana, Brassicaceae), wild black cherry (Prunus serotina, Rosaceae), and pokeweeds (Phytolacca spp., Phytolaccaceae).

has super-classes: inflorescence^c

rachilla of pedicellate spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006435

has super-classes: ear spikelet rachilla^c; part_of^op some ear pedicellate spikelet^c

rachilla of pedicellate spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006390

has super-classes: tassel spikelet rachilla^c; part_of^op some tassel pedicellate spikelet^c

rachilla of sessile spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006436

has super-classes: ear spikelet rachilla^c

rachilla of sessile spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006389

has super-classes: tassel spikelet rachilla^c; part_of^op some tassel sessile spikelet^c; part_of^op some ear sessile spikelet^c

radicle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020031

May develop into the primary root (PO:0020127) and eventually the root system (PO:0025025) of an adult plant. Sometimes abortive.

has super-classes: embryo root^c
has sub-classes: plant embryo radicle^c, seedling radicle^c

radicle emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007015

The actual point of emergence from the seed coat (PO:0009088) may not be observed if the seed is underneath a growth medium. In a fruit (PO:0009001) with a persistent pericarp (PO:0009084), emergence from the seed coat may not be observed. If the fruit is a caryopsis, the dry pericarp is fused with the seed coat, and emergence from the pericarp is simultaneous with emergence from the seed coat. This term is used only for seed plants.

has super-classes: b f o 0000003; root development stage^c; part_of^op some seed germination stage^c

raphe^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020027

has super-classes: cardinal organ part^c; part_of^op some plant ovule^c

rapid elongation of leaf sheath stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001024

Occurs in the Poaceae.

has super-classes: vascular leaf expansion stage^c

rapid elongation of vascular leaf lamina stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001023

has super-classes: vascular leaf expansion stage^c

ray flower^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025331

Found in the Asteraceae, surrounding the disk flowers (PO:0025332). Usually zygomorphic, and different in form from disk flowers. Usually pistillate but sterile.

has super-classes: pistillate flower^c

ray initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000082

has super-classes: cambial initial cell^c

ray secondary xylem parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004534

Occurs in bands or rays of variable width and height that extend radially in the secondary xylem (PO:0005848) and secondary phloem (PO:0005043) of a plant axis (PO:0025004).

is equivalent to: secondary xylem parenchyma^c and (part_of^op some ray system^c)
has super-classes: secondary xylem parenchyma^c; part_of^op some ray system^c

ray secondary xylem parenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004527

is equivalent to: secondary xylem parenchyma cell^c and (part_of^op some ray secondary xylem parenchyma^c)
has super-classes: b f o 0000004; secondary xylem parenchyma cell^c; develops_from^op some ray initial cell^c; part_of^op some ray secondary xylem parenchyma^c
has sub-classes: procumbent ray secondary xylem parenchyma cell^c, upright ray secondary xylem parenchyma cell^c

ray system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025411

May include ray tracheids, as in Pinaceae and some Cupressaceae.

has super-classes: secondary vascular tissue^c

reaction wood^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025472

Develops as a response to gravity (either tension or compression) and may function in restoring a stem (PO:0009047) or branch (PO:0025073) that is leaning to its original position. May be either compression wood, found on the lower side of a gymnosperm shoot axis, or tension wood, found on the upper side of an angiosperm shoot axis.

has super-classes: secondary xylem^c
has sub-classes: compression wood^c, tension wood^c

receptacle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009064

The fleshy part of a strawberry develops from a receptacle.

has super-classes: cardinal organ part^c

receptacle cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025591

has super-classes: cortex^c; part_of^op some receptacle^c

receptacle pith^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025590

has super-classes: pith^c; part_of^op some receptacle^c

replum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005016

This term was made obsolete to avoid confusion with the new terms fruit replum and ovary replum. Consider ovary replum (PO:0025272) or fruit replum (PO:0025267).

reproductive bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025084

has super-classes: bud^c; reproductive shoot system^c
has sub-classes: axillary reproductive bud^c, flower bud^c, inflorescence bud^c, strobilus bud^c, terminal reproductive bud^c

reproductive shoot apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025222

has super-classes: shoot axis apex^c

reproductive shoot apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008028

has super-classes: shoot apical meristem^c; part_of^op some reproductive shoot apex^c
has sub-classes: flower meristem^c, inflorescence apical meristem^c

reproductive shoot system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025082

has super-classes: b f o 0000002; shoot system^c; participates_in^op some reproductive shoot system development stage^c
has sub-classes: flower^c, flower fascicle^c, inflorescence^c, infructescence^c, reproductive bud^c, second order inflorescence^c, second order infructescence^c, spikelet^c, strobilus^c

reproductive shoot system development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025530

has super-classes: shoot system development stage^c
has sub-classes: flower development stage^c, inflorescence development stage^c

reproductive structures^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009083

resin canal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005665

has super-classes: canal^c

resin cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025604

has super-classes: epidermal cell^c

rhexigenous aerenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005704

The term was made obsolete because rhexigenous form is an attribute of regular aerenchyma.

rhipidium inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030131

Examples include species of the Iris family (Iridaceae).

has super-classes: inflorescence^c

rhizoid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030078

May be unicellular or multicellular. Serves to anchor the plant to the substrate, and may function in nutrient and water uptake. Usually lacks chlorophyll. Includes epidermal rhizoids that grow from the epidermis of bryophytes and pteridophytes in the gametophytic phase or from the stems of some monocots, protonemal rhizoids that branch from a protonema, and rhizoids that develop from a basal cell of a gametophore bud.

has super-classes: plant structure^c
has sub-classes: epidermal rhizoid^c, protonemal rhizoid^c

rhizoid meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030080

has super-classes: gametophyte meristematic apical cell^c; part_of^op some rhizoid^c

rhizome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004542

In ferns and many monocots, a rhizome is a primary axis (stem), while in other species, it is a branch. Usually produces scale-like leaves.

has super-classes: shoot axis^c

rhizome internode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025204

has super-classes: shoot axis internode^c; part_of^op some rhizome^c

rhizome scale leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025278

has super-classes: scale leaf^c

rib zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000226

has super-classes: portion of meristem tissue^c; part_of^op some shoot apical meristem^c

root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009005

Roots function in the absorption of water and inorganic nutrients, anchoring the plant body to the substrate and supporting it, storage of food and nutrients, and vegetative reproduction. The roots of most vascular plant species enter into symbiosis with soil-borne microorganisms. Roots are usually positively geotropic and found underground, although there are many exceptions such as the aerial roots of orchids. Roots often form secondary thickening from the root lateral meristem (PO:0006308). Commonly thought of as one of the three basic parts of the plant body, along with the shoot axis (PO:0025029) and leaves (PO:0025034).

has super-classes: b f o 0000004; plant axis^c; part_of^op some root system^c; develops_from^op some root primordium^c
has sub-classes: embryo root^c, lateral root^c, primary root^c, proteoid root^c, shoot-borne root^c, tuberous root^c, tuberous root tuber^c

root aerenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006213

has super-classes: aerenchyma^c; part_of^op some root^c

root anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025433

Only detectable by gene expression, not morphology. May arise in a pericycle (PO:0006203), as for lateral roots in most seed plants, an endodermis (PO:0000252), as for lateral roots in ferns, or from parenchyma cells (PO:0000074) that are part a shoot axis (PO:0025029), in the case of a basal root (PO:0025002) or shoot-borne root (PO:0000042).

has super-classes: portion of meristem tissue^c

root apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020147

In most cases, it is involved in root elongation.

has super-classes: root meristem^c; apical meristem^c; part_of^op some root^c
has sub-classes: lateral root apical meristem^c, primary root apical meristem^c, shoot-borne root apical meristem^c

root cambial zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025441

Includes a cambium (PO:0005597) and adjacent cells. This term is used when the borders of the cambium are not clear.

is equivalent to: cambial zone^c and (part_of^op some root^c)
has super-classes: cambial zone^c; part_of^op some root^c

root cap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020123

Often composed of living and dead parenchyma cells. Protects the root apical meristem.

has super-classes: root parenchyma^c; part_of^op some root tip^c
has sub-classes: root cap of lateral root^c, root cap of primary root^c

root cap formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007501

The number and origin of root cap initials that form the root cap varies among species. The root cap initials become independent from the more internally located root meristem cells by an increase in the thickness of the cell wall that separates them.

has super-classes: 3 establishment of tissue systems stage^c

root cap of lateral root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003018

has super-classes: root cap^c; part_of^op some lateral root tip^c

root cap of primary root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003017

has super-classes: root cap^c; part_of^op some primary root tip^c

root cork cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025436

has super-classes: cork cambium^c; part_of^op some root^c

root cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000258

In dicots and gymnosperms, the cortex consists of mainly parenchyma cells. In monocots sclerenchyma develops in addition to parenchyma.

has super-classes: cortex^c; part_of^op some root^c

root cortex differentiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007513

Repetitive periclinal divisions and radial enlargement of cells form the cortex layers, the innermost layers become the endodermis with the differentiation of casparian strips.

has super-classes: 3 establishment of tissue systems stage^c

root cortex-endodermis initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000060

has super-classes: root initial cell^c

root development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007520

At present the stages are described for primary, lateral and crown roots and stages for adventitious root formed by wounding or hormone treatment is not described. Finer resolution of root stages has been kept in the obsolete node as they are not consistently used in the consulted literature. These terms will be reintroduced into the ontology when there is a specific user request.

has super-classes: plant organ development stage^c
has sub-classes: 1 root primordium formation stage^c, 2 root meristem formation stage^c, 3 establishment of tissue systems stage^c, 4 root elongation stage^c, 5 root hair formation stage^c, coleorhiza emergence stage^c, radicle emergence stage^c

root differentiation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020135

Most of the primary tissues of a root mature in the differentiation zone. This zone is where root hairs are produced.

has super-classes: plant axis differentiation zone^c; part_of^op some root^c
has sub-classes: lateral root differentiation zone^c, primary root differentiation zone^c

root elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025181

The root elongation zone is only a few millimeters in length and is the only portion of the root in which cell elongation generally occurs. Root hairs are not yet produced in this region. Primary root tissues begin to differentiate in the root elongation zone. This term replaces elongation zone (PO:0020125).

has super-classes: plant axis elongation zone^c; part_of^op some root tip^c
has sub-classes: lateral root elongation zone^c, primary root elongation zone^c

root emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007510

has super-classes: 4 root elongation stage^c
has sub-classes: crown root emergence stage^c, lateral root emergence stage^c

root endodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005059

has super-classes: endodermis^c; part_of^op some root cortex^c

root epidermal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025164

has super-classes: epidermal cell^c; part_of^op some root epidermis^c
has sub-classes: non-hair root epidermal cell^c, root hair cell^c, trichoblast^c

root epidermal differentiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007516

Root hairs come to full development beyond the region of elongation zone, approximately at the level where the xylem begins to mature.

has super-classes: 3 establishment of tissue systems stage^c

root epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006036

The root epidermis is different from the shoot epidermis in its origin, function and structure.

is equivalent to: epidermis^c and (part_of^op some root^c)
has super-classes: epidermis^c; part_of^op some root^c
has sub-classes: root prickle^c, shoot-borne root epidermis^c, velamen^c

root giant cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005026

has super-classes: ground tissue cell^c; part_of^op some root vascular system^c

root hair cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000256

Compare with non-hair root epidermal cell (PO:0000263). This term is for an entire epidermal cell that contains a root hair extension. To describe only the cell extension, see root hair (GO:0035618) or root hair tip (GO:0035619).

has super-classes: b f o 0000004; root epidermal cell^c; develops_from^op some trichoblast^c

root hair tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000029

This term was made obsolete because it is a subcellular component. Root hair tip (GO:0035619) has been added to GO. To annotate to a cell that has a root hair tip, consider root hair cell (PO:0000256).

root initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000059

has super-classes: initial cell^c; part_of^op some quiescent center^c
has sub-classes: columella root cap initial cell^c, lateral root-cap epidermal initial cell^c, root cortex-endodermis initial cell^c
is disjoint with: cambial initial cell^c, epidermal initial cell^c, protonema side branch initial cell^c, protonema sub-apical initial cell^c

root lateral meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006308

Not to be confused with lateral root apical meristem (PO:0006020), which is an apical meristem (PO:0020144) of a lateral root (PO:0020121).

has super-classes: lateral meristem^c; part_of^op some root^c

root meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006085

has super-classes: portion of meristem tissue^c; part_of^op some root system^c
has sub-classes: root apical meristem^c, root nodule meristem^c

root meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030008

Occurs in the sporophytic phase of pteridophytes.

has super-classes: sporophyte meristematic apical cell^c; part_of^op some root tip^c

root nodule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003023

Root nodules are a symbiosis between a plant (often, but not exclusively, of the Fabaceae) and bacteria of the genus Rhizobium, Bradyrhizobium, or Azorhizobium.

has super-classes: b f o 0000004; cardinal organ part^c; develops_from^op some root nodule meristem^c; part_of^op some root^c
has sub-classes: adventitious root nodule^c, determinate nodule^c, indeterminate nodule^c

root nodule meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025194

has super-classes: root meristem^c

root parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025095

has super-classes: parenchyma^c; part_of^op some root^c
has sub-classes: central root cap^c, lateral root cap^c, root cap^c

root periderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005047

has super-classes: periderm^c; part_of^op some root^c
has sub-classes: root periderm scar^c

root periderm scar^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030090

Root periderm scars are lenticel-like structures on the tuberous roots (PO:0025523), primary roots (PO:0020127), and/or tuberous root tubers (PO:0025476) of plants such as sweet potato, cassava, parsnips, and carrots. Disruption of the epidermis by the emergence of a lateral root initiates a wound response which results in the production of a root periderm scar. Gas exchange does not occur through a root periderm scar.

has super-classes: root periderm^c

root perimedullary zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025065

has super-classes: perimedullary zone^c; part_of^op some root pith^c

root pith^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005040

has super-classes: pith^c; part_of^op some root stele^c

root prickle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025170

has super-classes: root epidermis^c; prickle^c

root primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005029

A root primordium may arise from cells of a pericycle (PO:0006203) in a root in most seed plant (pericyclic lateral root primordium; PO:0025492), from cells of an endodermis (PO:0000252) in ferns and some seed plants (non-pericyclic lateral root primordium: PO:0025493), or from cells of a shoot axis (PO:0025029), in the case of a basal root primordium (PO:0025479) or shoot-borne root primordium (PO:0025480). Transition from root primordium to root occurs with the formation of a root cap (PO:0020123), shortly after the development of a root apical meristem (PO:0020147).

has super-classes: b f o 0000004; primordium^c; develops_from^op some root anlagen^c
has sub-classes: basal root primordium^c, lateral root primordium^c, shoot-borne root primordium^c

root primordium visible^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007536

root procambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006307

A derivative of the root apical meristem.

has super-classes: procambium^c; part_of^op some root apical meristem^c

root secondary thickening meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025443

is equivalent to: secondary thickening meristem^c and (part_of^op some root^c)
has super-classes: secondary thickening meristem^c; part_of^op some root^c

root stele^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020124

Includes the pericycle as the outermost layer of the stele.

has super-classes: stele^c; part_of^op some root^c

root syncytium cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005027

has super-classes: ground tissue cell^c; part_of^op some root vascular system^c

root system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025025

Generally the below ground portion of a vascular plant.

has super-classes: b f o 0000002; collective plant organ structure^c; participates_in^op some sporophyte development stage^c
is disjoint with: shoot system^c

root system exarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025555

has super-classes: exarch protoxylem^c
has sub-classes: diarch protoxylem^c, monarch protoxylem^c, pentarch protoxylem^c, polyarch protoxylem^c, tetrarch protoxylem^c, triarch protoxylem^c

root system ground meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025596

has super-classes: ground meristem^c; part_of^op some root system^c

root system phloem sap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025567

has super-classes: phloem sap^c

root system xylem sap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025568

has super-classes: xylem sap^c

root tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000025

has super-classes: cardinal organ part^c; part_of^op some root^c
has sub-classes: lateral root tip^c, primary root tip^c

root vascular cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025438

has super-classes: vascular cambium^c; part_of^op some root^c

root vascular cylinder differentiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007509

The first identifiable region in the differentiating vascular cylinder is the pericycle. In the xylem the differentiation of the tracheary elements begins in a centrifugal direction but is completed in the centripetal direction. The first phloem elements mature before the first xylem elements.

has super-classes: 3 establishment of tissue systems stage^c

root vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003011

This term was brought back from OBSOLETE node (original reason for OBSOLETE: synonym of term stele). Since stele encompasses both vascular system and the pith, in roots with pith, vascular system and stele are not synonymous.

has super-classes: vascular system^c; part_of^op some root stele^c

root-borne shoot system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004544

has super-classes: shoot system^c

root-derived cultured plant cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000008

May be derived from cultured plant callus or plant protoplasts induced from a segment of root. In the case of the plant protoplast, after the re-establishment plant cell walls.

has super-classes: cultured plant cell^c; derives_by_manipulation_from^op some root^c

rosette^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025615

has super-classes: collective leaf structure^c

rosette growth complete stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007078

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: rosette growth stage^c

rosette growth stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007113

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: 1 main shoot growth stage^c
has sub-classes: early rosette growth stage^c, late rosette growth stage^c, mid rosette growth stage^c, rosette growth complete stage^c

rosette leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000014

Arabidopsis, vegetative development is characterized by the production of the rosette leaves.

has super-classes: vascular leaf^c; part_of^op some rosette^c

rosette paraclade^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025548

has super-classes: second order inflorescence axis^c

salt gland^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005661

A crust of salt forms on leaves which tastes bad and the white surfaces act to reflect light. Example, as is Mangrove vegetation.

has super-classes: portion of secretory tissue^c

samara fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030099

The pericarp (PO:0009084) can be expanded laterally or radially. The wing-shaped fruits of maples (Acer spp.) are often mistakenly identified as samara fruits (PO:0030099), but are instead schizocarp fruits (PO:0030098) with samaroid mericarps (PO:0020075). Examples: green ash (Fraxinus pennsylvanicum) and tree-of-heaven (Ailanthus altissima).

has super-classes: fruit^c

sapwood^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004513

Sapwood contains reserve materials and may function in the conduction of water and minerals (xylem sap (PO:0025539)). It is generally lighter colored than the heartwood (PO:0004512) and is located between the heartwood and the vascular cambium (PO:0005598) of a shoot axis (PO:0025029) or root (PO:0009005). Sapwood forms during a secondary xylem development stage (PO:0025427).

has super-classes: secondary xylem^c; part_of^op some plant axis^c

scale leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006003

May be photosynthetic or non-photosynthetic. Some species have vascular leaves that are scale-like (such as Juniperus, Thuja, and Chamaecyparis). Annotations for scale-like leaves should go under vascular leaf (PO:0009025), not scale leaf.

has super-classes: phyllome^c
has sub-classes: bud scale leaf^c, rhizome scale leaf^c

scale leaf margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025014

has super-classes: phyllome margin^c; part_of^op some scale leaf^c

schizo-lysigenous aerenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005349

The term was made obsolete because schizo-lysigenous form is an attribute of regular aerenchyma.

schizocarp fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030098

Each individual carpellate unit of a schizocarp fruit (PO:0030098) is a mericarp (PO:0020075). Examples: maple (Acer spp.) and cassava (Manihot esculenta).

has super-classes: fruit^c

sclerenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005427

has super-classes: portion of ground tissue^c; has_part^op some sclerenchyma cell^c

sclerenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000077

May be dead at maturity. The secondary cell wall of a sclerenchyma cell is often thicker than other cell types in the same plant structure, but it is not always easy to distinguish from tracheary elements (PO:0000290) or sclerified parenchyma cells (PO:0000074). Compare with collenchyma cells (PO:0000075) that are always alive at maturity, have irregularly thickened primary cell walls, and do not have lignified secondary cell walls. Collenchyma cells provides flexibility while sclerenchyma cells provide hardness. Sclerenchyma cells include plant fiber cells (PO:0025407) and sclerid cells (PO:0025418).

has super-classes: ground tissue cell^c
has sub-classes: plant fiber cell^c, sclerid cell^c

sclerid cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025418

Usually not very elongated. The lumen of a sclerid cell is occluded by the secondary cell wall.

has super-classes: sclerenchyma cell^c

sculpture elements^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020015

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043675.

scutellar epithelium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008048

has super-classes: portion of embryo plant tissue^c; part_of^op some scutellum^c

scutellar node^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004708

Found in grasses where no hypocotyl is present. The scutellar node may represent a reduction of the hypocotyl and cotyledonary node.

has super-classes: stem node^c; embryo plant structure^c; part_of^op some plant embryo axis^c

scutellum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020110

May be a modified cotyledon.

has super-classes: embryo plant structure^c

scutellum epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006049

is equivalent to: shoot system epidermis^c and (part_of^op some scutellum^c)
has super-classes: shoot system epidermis^c; portion of embryo plant tissue^c; part_of^op some scutellum^c

scutellum vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008047

has super-classes: vascular system^c; portion of embryo plant tissue^c; part_of^op some scutellum^c; part_of^op some plant embryo vascular system^c

SE.00 stem elongation begins stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007079

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.01 one node or internode visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007091

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.02 two nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007117

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.03 three nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007096

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.04 four nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007092

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.05 five nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007086

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.06 six nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007062

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.07 seven nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007108

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.08 eight nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007070

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.09 nine nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007066

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.10 ten nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007084

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.11 eleven nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007114

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.12 twelve nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007111

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.13 thirteen nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007090

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.14 fourteen nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007097

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.15 fifteen nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007074

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.16 sixteen or more nodes or internodes visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007100

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.97 flag leaf visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007099

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

SE.99 maximum stem length reached stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007109

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: stem elongation stage^c

second order inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025240

This a sub-inflorescence that arises from the main inflorescence axis.

has super-classes: c a r o 0000000; reproductive shoot system^c; has_part^op some flower^c; has_part^op some second order inflorescence axis^c; part_of^op some inflorescence^c

second order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006321

has super-classes: higher order inflorescence axis^c
has sub-classes: accessory paraclade^c, cauline paraclade^c, rosette paraclade^c

second order infructescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025241

has super-classes: c a r o 0000000; reproductive shoot system^c; has_part^op some second order infructescence axis^c; has_part^op some fruit^c; part_of^op some infructescence^c

second order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025112

has super-classes: higher order infructescence axis^c

secondary cell wall formation stage of secondary xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025465

During this stage, secondary cell walls (GO:0009531) are being formed in a portion of secondary xylem tissue, preventing further expansion of the cells. This stage succeeds a cell expansion stage of secondary xylem (PO:0025464) and precedes a cell death stage of secondary xylem.

has super-classes: cell differentiation stage of secondary xylem^c

secondary leaf vein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020140

Vein orders only apply to hierarchically branching vein patterns, not to dichotomously branching vein patterns, as found in some ferns and gymnosperms.

has super-classes: leaf lamina vein^c
has sub-classes: lateral leaf vein^c

secondary phloem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005043

Secondary phloem develops as part of secondary growth (GO:0080117).

has super-classes: phloem^c; secondary vascular tissue^c
has sub-classes: included phloem^c

secondary phloem sieve cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025456

is equivalent to: sieve cell^c and (part_of^op some secondary phloem^c)
has super-classes: sieve cell^c; secondary phloem sieve element^c

secondary phloem sieve element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025453

is equivalent to: sieve element^c and (part_of^op some secondary phloem^c)
has super-classes: sieve element^c; part_of^op some secondary phloem^c
has sub-classes: secondary phloem sieve cell^c, secondary phloem sieve tube element^c

secondary phloem sieve tube element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025457

is equivalent to: sieve tube element^c and (part_of^op some secondary phloem^c)
has super-classes: sieve tube element^c; secondary phloem sieve element^c

secondary thickening meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025414

Contributes mainly to formation of the body of a stem (PO:0009047), but may also produce adventitious (shoot-borne) roots (PO:0000042) and may also be found in the roots (PO:0009005) of some species. May be continuous or discontinuous with the primary thickening meristem (PO:0005039). Found in some monocot species of the Liliales and Asperigales.

has super-classes: lateral meristem^c
has sub-classes: root secondary thickening meristem^c, stem secondary thickening meristem^c

secondary vascular tissue^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025409

Forms as part of secondary growth (GO:0080117) in vascular plants. Often differentiated into the axial system (PO:0025410) and ray system (PO:0025411).

is equivalent to: portion of vascular tissue^c and (develops_from^op some vascular cambium^c)
has super-classes: b f o 0000004; portion of vascular tissue^c; develops_from^op some vascular cambium^c
has sub-classes: axial system^c, ray system^c, secondary phloem^c, secondary xylem^c

secondary xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005848

Secondary xylem develops as part of secondary growth (GO:0080117). Secondary xylem is the wood of gymnosperm and dicot angiosperm trees, shrubs, and lianas. May be organized into axial (PO:0025410) and ray (PO:0025411) systems. Secondary xylem is often part of a shoot axis (PO:0025029) or a root (PO:0009005) but may occur in other organs. Some monocots have a primary thickening meristem (PO:0005039), located near the shoot apical meristem (PO:0020148), that gives the appearance of secondary growth and may produce lignified tissue that appears woody but is not composed of secondary xylem. Tracheary elements in secondary xylem (PO:0000290) have lignified cell walls with secondary thickening and are dead at maturity.

has super-classes: xylem^c; secondary vascular tissue^c
has sub-classes: early wood^c, growth ring^c, growth ring boundary^c, heartwood^c, late wood^c, reaction wood^c, sapwood^c

secondary xylem development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025427

During a secondary xylem development stage (also called a wood development stage), the cells of secondary xylem (PO:0005848), including tracheary elements (PO:0000290), xylem fiber cells (PO:0000274), and wood parenchyma cells (PO:0004525) undergo cellular developmental processes (GO:0048869) such as cell division (GO:0051301), cell growth (GO:0016049), cell differentiation (GO:0030154), or cell death (GO:0008219). The transition from sapwood to heartwood marks the end of the secondary xylem development stage.

has super-classes: xylem development stage^c; has_participant^op some secondary xylem^c
has sub-classes: cell differentiation stage of secondary xylem^c, cell division stage of secondary xylem^c

secondary xylem parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004532

is equivalent to: parenchyma^c and (part_of^op some secondary xylem^c)
has super-classes: parenchyma^c; part_of^op some secondary xylem^c
has sub-classes: axial secondary xylem parenchyma^c, ray secondary xylem parenchyma^c

secondary xylem parenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004525

is equivalent to: parenchyma cell^c and (part_of^op some secondary xylem parenchyma^c)
has super-classes: parenchyma cell^c; part_of^op some secondary xylem parenchyma^c
has sub-classes: axial secondary xylem parenchyma cell^c, ray secondary xylem parenchyma cell^c

secondary xylem parenchyma cell death stage of secondary xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025468

During this stage, the secondary xylem parenchyma cells (PO:0004525) and septate xylem fiber cells (septate fiber tracheid, PO:0025419, and septate libriform fiber cell, PO:0025420) of a portion of secondary xylem (PO:0005848) undergo cell death (GO:0008219). Succeeds a tracheary element death stage of secondary xylem (PO:0025467). Once all cells in portion of secondary xylem are dead, it transitions from sapwood (PO:0004513) to heartwood (PO:0004512), and secondary xylem development ends.

has super-classes: cell death stage of secondary xylem^c

secondary xylem tracheary element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025445

is equivalent to: tracheary element^c and (part_of^op some secondary xylem^c)
has super-classes: tracheary element^c; part_of^op some secondary xylem^c
has sub-classes: early wood tracheary element^c, late wood tracheary element^c, secondary xylem tracheid^c, secondary xylem vessel member^c

secondary xylem tracheid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025447

is equivalent to: tracheid^c and (part_of^op some secondary xylem^c)
has super-classes: tracheid^c; secondary xylem tracheary element^c

secondary xylem vessel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025451

is equivalent to: xylem vessel^c and (part_of^op some secondary xylem^c)
has super-classes: xylem vessel^c; part_of^op some secondary xylem^c

secondary xylem vessel member^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025449

is equivalent to: xylem vessel member^c and (part_of^op some secondary xylem^c)
has super-classes: xylem vessel member^c; secondary xylem tracheary element^c

secretory cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004012

This is a functional term.

seed^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009010

A seed generally develops from an ovule (PO:0020003) after fertilization, but may develop without fertilization in the case of apogamy (e.g., adventitious embryos or somatic embryos). A seed is a reproductive unit of seed plants (gymnosperms, angiosperms, and fossil pteridosperms).

has super-classes: b f o 0000004; multi-tissue plant structure^c; develops_from^op some plant ovule^c; has_part^op some plant embryo^c

seed and fruit wall as dispersal unit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020085

seed as dispersal unit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020081

seed chalaza^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006333

has super-classes: b f o 0000004; portion of plant tissue^c; part_of^op some seed^c; develops_from^op some chalaza^c

seed coat^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009088

Used only when not specified more precisely; see testa, tegmen.

has super-classes: portion of plant tissue^c; part_of^op some seed^c

seed coat epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006048

is equivalent to: epidermis^c and (part_of^op some seed coat^c)
has super-classes: epidermis^c; part_of^op some seed coat^c
has sub-classes: coma^c, endotegmen^c, endotesta^c, exotegmen^c, exotesta^c

seed development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001170

Includes the stages of seed development, from fertilization to the dry or quiescent state. May have as part an embryo development stage.

has super-classes: multi-tissue plant structure development stage^c
has sub-classes: developing seed stage^c, dry seed stage^c, endosperm development stage^c, fertilized ovule stage^c, seed dormant stage^c, seed maturation stage^c

seed dormant stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025374

A seed dormancy process (GO:0010162) is a dormancy process in which dormancy (sometimes called a dormant state) is induced, maintained or broken in a seed. Seed dormancy is a suspension of most physiological activity and growth in a seed, including the embryo contained therein, that can be reactivated. It often requires special conditions for reactivation, such as specific temperature, scarification, or leaching of inhibitors. Seed dormancy includes dormancy of the embryo and the seed coat, although these may not begin or end simultaneously. Not all seeds go through a seed dormant stage. Most seeds that go through a dormant stage do so only one time.

has super-classes: b f o 0000003; seed development stage^c; preceded_by^op some dry seed stage^c; has_part^op some plant embryo dormant stage^c

seed funicle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006332

has super-classes: b f o 0000004; cardinal part of multi-tissue plant structure^c; develops_from^op some funicle^c; part_of^op some seed^c

seed germination stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007057

has super-classes: sporophyte vegetative stage^c
has sub-classes: seed imbibition stage^c

seed imbibition stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007022

has super-classes: seed germination stage^c

seed maturation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007632

has super-classes: b f o 0000003; seed development stage^c; preceded_by^op some developing seed stage^c

seed micropyle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006334

has super-classes: b f o 0000004; plant anatomical space^c; develops_from^op some plant ovule micropyle^c; part_of^op some seed coat^c

seed obturator^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006336

has super-classes: b f o 0000004; portion of plant tissue^c; develops_from^op some obturator^c; part_of^op some seed funicle^c

seed operculum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0019024

has super-classes: portion of plant tissue^c; part_of^op some seed^c

seed raphe^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006331

has super-classes: b f o 0000004; cardinal part of multi-tissue plant structure^c; develops_from^op some raphe^c; part_of^op some seed^c

seed storage parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025067

has super-classes: storage parenchyma^c; part_of^op some seed^c
has sub-classes: endosperm parenchyma^c

seed trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004511

has super-classes: trichome^c; part_of^op some seed coat epidermis^c

seed trichome development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025369

Seed trichome development stage consists of the following sub stages: seed trichome initiation stage (PO:0025370), seed trichome elongation stage (PO:0025371), seed trichome secondary wall biosynthesis stage(PO:0025372) and seed trichome maturation stage (PO:0025373).

has super-classes: trichome development stage^c; has_participant^op some seed trichome^c
has sub-classes: seed trichome elongation stage^c, seed trichome initiation stage^c, seed trichome maturation stage^c, seed trichome secondary wall biosynthesis stage^c

seed trichome elongation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025371

Refers to the GO Biological Process terms: seed trichome elongation (GO:0090378) and secondary cell wall biogenesis involved in seed trichome differentiation (GO:0090379).

has super-classes: seed trichome development stage^c

seed trichome initiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025370

Refers to the GO Biological Process terms seed trichome initiation (GO:0090377) and seed trichome elongation (GO:0090378).

has super-classes: seed trichome development stage^c

seed trichome maturation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025373

Refers to the GO Biological Process term: seed trichome maturation (GO:0090380).

has super-classes: seed trichome development stage^c

seed trichome secondary wall biosynthesis stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025372

Refers to the GO Biological Process terms: secondary cell wall biogenesis involved in seed trichome differentiation (GO:0090379) and seed trichome maturation (GO:0090380).

has super-classes: seed trichome development stage^c

seedling^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008037

This term was made obsolete. Replaced by whole plant growth stage seedling growth (PO:0007131) and whole plant (PO:0000003).

seedling coleoptile^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025287

A seedling coleoptile develops from an embryo coleoptile (PO:0025286).

has super-classes: b f o 0000004; coleoptile^c; participates_in^op some seedling development stage^c; develops_from^op some plant embryo coleoptile^c

seedling coleorhiza^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025289

Develops from an embryo coleorhiza (PO:0025288).

has super-classes: b f o 0000004; coleorhiza^c; develops_from^op some embryo coleorhiza^c

seedling cotyledon^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025471

Develops from an embryo cotyledon (PO:0025470).

has super-classes: cotyledon^c; develops_from^op some plant embryo cotyledon^c

seedling development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007131

This terms is used only for seed plants, although non-seed plants may have a comparable phase during which they produce juvenile or transition leaves.

has super-classes: sporophyte vegetative stage^c
has sub-classes: cotyledon emergence stage^c, epicotyl emergence stage^c, hypocotyl emergence stage^c, seedling shoot emergence stage^c

seedling epicotyl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025293

Develops from an embryo epicotyl (PO:0025292).

has super-classes: b f o 0000004; epicotyl^c; develops_from^op some embryo epicotyl^c

seedling hypocotyl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025291

Develops from an embryo hypocotyl (PO:0025290). This term should only be used for seed plants.

has super-classes: b f o 0000004; hypocotyl^c; participates_in^op some seedling development stage^c; develops_from^op some embryo hypocotyl^c

seedling hypocotyl-root junction^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025301

Part of a whole plant (PO:0000003) in the seedling development stage (PO:0007131).

has super-classes: b f o 0000004; hypocotyl-root junction^c; develops_from^op some embryo hypocotyl-root junction^c

seedling mesocotyl^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025295

A seedling mesocotyl is an elongation of an embryo mesocotyl (PO:0025294) and is part of a whole plant (PO:0000003) in the seedling development stage (PO:0007131).

has super-classes: b f o 0000004; mesocotyl^c; develops_from^op some embryo mesocotyl^c

seedling radicle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025297

Develops from an embryo radicle (PO:0025296). May develop into the root system (PO:0025025) of an adult plant. Sometimes is abortive.

has super-classes: radicle^c; develops_from^op some plant embryo radicle^c

seedling shoot emergence stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007030

has super-classes: seedling development stage^c

seminal root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000046

has super-classes: embryo root^c; shoot-borne nodal root^c

sepal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009031

In some species the sepals (PO:0009031) may not be green for example many members of the Liliaceae family.

has super-classes: phyllome^c; floral organ^c; part_of^op some calyx^c; develops_from^op some sepal primordium^c
has sub-classes: free sepal^c, fused sepal^c

sepal abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006054

has super-classes: sepal epidermis^c

sepal adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006055

has super-classes: sepal epidermis^c

sepal anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025485

has super-classes: phyllome anlagen^c

sepal apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025145

It is not precisely defined how far toward the base from the tip a sepal apex extends. For the apical most portion of a sepal, use the term sepal tip.

has super-classes: phyllome apex^c; part_of^op some sepal^c

sepal base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025147

has super-classes: phyllome base^c; part_of^op some sepal^c

sepal differentiation and expansion stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001044

has super-classes: calyx development stage^c
has sub-classes: sepals enclosing flower bud stage^c, sepals enclosing meristem stage^c

sepal epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006040

is equivalent to: phyllome epidermis^c and (part_of^op some sepal^c)
has super-classes: phyllome epidermis^c; part_of^op some sepal^c
has sub-classes: sepal abaxial epidermis^c, sepal adaxial epidermis^c, sepal stomatal complex^c

sepal epidermis giant cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025499

Compare to other epidermal pavement cells that are approximately one hundredth of the length of a sepal (PO:0009031). In Arabidopsis, sepal giant epidermal cells arise by DNA endoreplication (GO:0042023) and have high DNA content (up to 16C).

has super-classes: epidermal pavement cell^c; part_of^op some sepal epidermis^c

sepal margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005021

has super-classes: phyllome margin^c; part_of^op some sepal^c

sepal mesophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006072

has super-classes: sepal parenchyma^c; mesophyll^c

sepal parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006068

has super-classes: parenchyma^c; part_of^op some sepal^c
has sub-classes: sepal mesophyll^c

sepal primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004704

has super-classes: phyllome primordium^c; floral organ primordium^c; develops_from^op some sepal anlagen^c

sepal primordium visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007607

has super-classes: calyx development stage^c

sepal stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025219

has super-classes: sepal epidermis^c; phyllome stomatal complex^c

sepal tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025150

This term is to be used for only the apical most portion of a sepal. For a larger area, use the term sepal apex. Use this term when describing the shape of a sepal tip.

has super-classes: phyllome tip^c; part_of^op some sepal apex^c

sepal trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025182

has super-classes: phyllome trichome^c; part_of^op some sepal epidermis^c

sepal vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004723

has super-classes: phyllome vascular system^c; part_of^op some sepal^c; part_of^op some flower vascular system^c

sepals 100% of final size^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007610

sepals 50% of final size^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007609

sepals enclosing flower bud stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001380

has super-classes: sepal differentiation and expansion stage^c

sepals enclosing meristem stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001378

has super-classes: sepal differentiation and expansion stage^c

separation layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006211

Directly involved in the weakening process of abscission.

has super-classes: portion of plant tissue^c; part_of^op some abscission zone^c

septate fiber cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004521

A septate fiber septum is composed of the adjacent primary cell walls of two internal cells that arise from mitosis within the septate fiber cell after it has formed a secondary cell wall (GO:0009531).

has super-classes: plant fiber cell^c
has sub-classes: septate fiber tracheid^c, septate libriform fiber cell^c, septate phloem fiber cell^c

septate fiber tracheid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025419

A septate fiber tracheid septum is composed of the adjacent primary cell walls of two internal cells that arise from mitosis within the septate fiber tracheid after it has formed a secondary cell wall (GO:0009531).

has super-classes: fiber tracheid^c; septate fiber cell^c

septate libriform fiber cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025420

A septate libriform fiber cell septum is composed of the adjacent primary cell walls of two internal cells that arise from mitosis within the septate libriform fiber cell after it has formed a secondary cell wall (GO:0009531).

has super-classes: libriform fiber cell^c; septate fiber cell^c

septate phloem fiber cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025421

A septatephloem fiber cell septum is composed of the adjacent primary cell walls of two internal cells that arise from mitosis within the septate phloem fiber cell after it has formed a secondary cell wall (GO:0009531).

has super-classes: phloem fiber cell^c; septate fiber cell^c

septicidal capsule fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030093

When annotating to a capsule fruit (PO:0030091) which dehisces through both the fruit septa (PO:0025268) and fruit locules (PO:0025270), annotate to coccarium capsule fruit (PO:0030094). When annotating to a capsule fruit which only dehisces through the fruit locules, annotate to loculicidal capsule fruit (PO:0030092). Examples: dutchman's pipe (Aristolochia elegans) and black cottonwood (Populus trichocarpa).

has super-classes: capsule fruit^c

septum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000030

A septum is formed by the fusion of the walls of two adjacent organs (ovary walls or anther walls), for example, the partition between two sections of an orange, seen in cross-section.

has super-classes: collective organ part structure^c
has sub-classes: anther septum^c, fruit septum^c, plant ovary septum^c

seta^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030032

Found in some bryophytes, especially mosses and liverworts.

has super-classes: b f o 0000002; stalk^c; participates_in^op some sporophyte development stage^c

seta meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030016

Ceases being an apical cell when the sporangium begins to develop.

has super-classes: shoot axis meristematic apical cell^c; part_of^op some seta^c

seventh order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025108

has super-classes: higher order inflorescence axis^c

seventh order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025252

has super-classes: higher order infructescence axis^c

sexine^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020012

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043673.

sheath cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004531

has super-classes: upright ray secondary xylem parenchyma cell^c

shoot apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020148

has super-classes: shoot system meristem^c; apical meristem^c; part_of^op some shoot axis apex^c
has sub-classes: reproductive shoot apical meristem^c, vegetative shoot apical meristem^c

shoot axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025029

Often bears leaves and branches. In vascular plants, has at least one node and one internode.

has super-classes: plant axis^c; part_of^op some shoot system^c
has sub-classes: adventitious shoot axis^c, branch^c, cladode^c, gametophore axis^c, gynophore^c, inflorescence axis^c, infructescence axis^c, pedicel^c, peduncle^c, rhizome^c, shoot axis apex^c, shoot axis tuber^c, stem^c, stem apex tendril^c

shoot axis apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000037

has super-classes: shoot axis^c
has sub-classes: branch apex^c, plumule^c, reproductive shoot apex^c, vegetative shoot apex^c

shoot axis cambial zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025440

Includes a cambium (PO:0005597) and adjacent cells. This term is used when the borders of the cambium are not clear.

is equivalent to: cambial zone^c and (part_of^op some shoot axis^c)
has super-classes: cambial zone^c; part_of^op some shoot axis^c

shoot axis cork cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025435

has super-classes: cork cambium^c; part_of^op some shoot axis^c

shoot axis cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000223

Can occur in a stem or branch.

has super-classes: cortex^c; part_of^op some shoot axis^c
has sub-classes: stem cortex^c

shoot axis endodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005058

Can occur in a stem or branch.

has super-classes: endodermis^c; part_of^op some shoot axis cortex^c

shoot axis epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000112

Can occur on a stem or branch.

is equivalent to: shoot system epidermis^c and (part_of^op some shoot axis^c)
has super-classes: shoot system epidermis^c; part_of^op some shoot axis^c
has sub-classes: branch epidermis^c, paraphyllium^c, shoot axis prickle^c, shoot axis tuber epidermis^c, stem epidermis^c

shoot axis hypodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005057

Can occur in a stem or branch.

has super-classes: hypodermis^c; part_of^op some shoot axis cortex^c
has sub-classes: stem hypodermis^c

shoot axis internode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005005

has super-classes: cardinal organ part^c; part_of^op some shoot axis^c
has sub-classes: branch internode^c, inflorescence axis internode^c, rhizome internode^c, stem internode^c

shoot axis internode elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025100

has super-classes: plant axis elongation zone^c; part_of^op some shoot axis internode^c
has sub-classes: branch internode elongation zone^c, stem internode elongation zone^c

shoot axis meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030010

Divides to produces leaf initial cells (if leaves are present) and other stem or branch tissues.

has super-classes: shoot meristematic apical cell^c; part_of^op some shoot axis apex^c
has sub-classes: gametophore axis meristematic apical cell^c, seta meristematic apical cell^c, vascular shoot axis meristematic apical cell^c

shoot axis node^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005004

has super-classes: cardinal organ part^c; part_of^op some shoot axis^c
has sub-classes: branch node^c, inflorescence axis node^c, stem node^c

shoot axis periderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005048

Can occur on a stem or branch.

has super-classes: periderm^c; part_of^op some bark^c; part_of^op some shoot axis^c
has sub-classes: shoot axis tuber periderm^c

shoot axis perimedullary zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025064

Can occur in a stem or branch.

has super-classes: perimedullary zone^c; part_of^op some shoot axis pith^c
has sub-classes: tuber perimedullary zone^c

shoot axis pith^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005041

Can occur in a stem or branch.

has super-classes: pith^c; part_of^op some shoot axis^c

shoot axis prickle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025171

has super-classes: shoot axis epidermis^c; prickle^c

shoot axis procambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025260

has super-classes: shoot procambium^c; part_of^op some shoot apical meristem^c
has sub-classes: branch procambium^c, stem procambium^c

shoot axis stele^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025198

has super-classes: stele^c; part_of^op some shoot axis^c
has sub-classes: branch stele^c, stem stele^c

shoot axis tegument layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025609

has super-classes: c a r o 0000000; portion of plant tissue^c; has_part^op some shoot axis hypodermis^c; has_part^op some shoot axis epidermis^c
has sub-classes: stem tegument layer^c

shoot axis trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005003

Can occur on a stem or branch.

has super-classes: trichome^c; part_of^op some shoot axis epidermis^c
has sub-classes: branch trichome^c, peduncle trichome^c, stem trichome^c

shoot axis tuber^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004543

Functions in storage of photosynthate metabolites. This term should be used for tubers derived from branches, as found in Solanum spp. (e.g. potato) or Dioscorea spp. (e.g. yam) and other species. Use the term tuberous root tuber (PO:0025476) for tubers derived from roots, such as those found in Cassava, Ipomoea, or Hemerocallis.

has super-classes: b f o 0000004; shoot axis^c; tuber^c; develops_from^op some branch^c
has sub-classes: aerial tuber^c, subterranean shoot axis tuber^c

shoot axis tuber axillary bud meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025068

As the bud grows, the meristem switches from being an axillary meristem to being a shoot apical meristem.

has super-classes: axillary bud meristem^c; part_of^op some shoot axis tuber^c
has sub-classes: aerial tuber axillary bud meristem^c, subterranean tuber axillary bud meristem^c

shoot axis tuber axillary vegetative bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025040

has super-classes: axillary vegetative bud^c; part_of^op some shoot axis tuber^c
has sub-classes: aerial tuber axillary vegetative bud^c, subterranean tuber axillary vegetative bud^c

shoot axis tuber epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025046

has super-classes: shoot axis epidermis^c; part_of^op some shoot axis tuber^c
has sub-classes: aerial tuber epidermis^c, subterranean tuber epidermis^c

shoot axis tuber periderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025043

has super-classes: shoot axis periderm^c; part_of^op some shoot axis tuber^c
has sub-classes: aerial tuber periderm^c, subterranean tuber periderm^c

shoot axis vascular cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025437

has super-classes: vascular cambium^c; part_of^op some shoot axis^c

shoot axis vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000039

Can occur in a stem or branch.

has super-classes: vascular system^c; part_of^op some shoot axis stele^c; part_of^op some shoot system vascular system^c
has sub-classes: pedicel vascular system^c

shoot epidermal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025165

has super-classes: epidermal cell^c; part_of^op some shoot system epidermis^c
has sub-classes: epidermal pavement cell^c, guard cell^c, guard mother cell^c, socket cell^c, subsidiary cell^c

shoot internode differentiation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025102

has super-classes: plant axis differentiation zone^c; part_of^op some shoot axis internode^c
has sub-classes: branch internode differentiation zone^c, stem internode differentiation zone^c

shoot lateral meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006344

has super-classes: lateral meristem^c; part_of^op some shoot axis^c
has sub-classes: primary thickening meristem^c

shoot meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030009

May occur in shoot axes or leaves of bryophytes or ferns.

has super-classes: meristematic apical cell^c; part_of^op some shoot system^c
has sub-classes: gametophore meristematic apical cell^c, leaf meristematic apical cell^c, shoot axis meristematic apical cell^c

shoot procambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025276

has super-classes: procambium^c; part_of^op some shoot system^c
has sub-classes: leaf procambium^c, shoot axis procambium^c

shoot system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009006

The shoot system is generally used to refer to the above-ground plant parts, although some plants have parts of their shoot system underground. For example, a rhizome (PO:0004542), bulb (PO:0025356), a corm (PO:0025355) or a subterranean tuber (PO:0004547), as in Solanum tuberosum (potato) or yam, are all part of the shoot system.

has super-classes: collective plant organ structure^c
has sub-classes: bud^c, bulb^c, corm^c, gametophore^c, inflorescence branch crown^c, primary shoot system^c, reproductive shoot system^c, root-borne shoot system^c, shoot-borne shoot system^c, vegetative shoot system^c
is disjoint with: root system^c

shoot system development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025527

The shoot system (PO:0009006) develops fron the shoot apical meristem (PO:0020148) in the plant embryo (PO:0009009) in vascular plants. In lower plants the gametophore (PO:0030018) arises from a gametophore meristematic apical cell (PO:0030019) in the protonema (PO:0030003).

has super-classes: collective plant organ structure development stage^c; has_participant^op some shoot system^c
has sub-classes: bud burst stage^c, bud development stage^c, reproductive shoot system development stage^c

shoot system epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006035

Often interrupted by stomatal complexes (PO:0002000) and other structures. The shoot system epidermis is different from the root epidermis (PO:0006036) in its origin, function and structure.

is equivalent to: epidermis^c and (part_of^op some shoot system^c)
has super-classes: epidermis^c; part_of^op some shoot system^c; develops_from^op some meristem L1 layer^c
has sub-classes: nectary epidermis^c, phyllome epidermis^c, scutellum epidermis^c, shoot axis epidermis^c, stomatal complex^c

shoot system exarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025556

has super-classes: exarch protoxylem^c

shoot system ground meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025595

The meristem L2 layer (PO:0009021) and meristem L3 layer (PO:0009021) of the are part of the shoot system ground meristem (PO:0025595).

has super-classes: ground meristem^c; part_of^op some shoot system^c

shoot system meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006079

has super-classes: portion of meristem tissue^c; part_of^op some shoot system^c
has sub-classes: axillary bud meristem^c, intercalary meristem^c, shoot apical meristem^c

shoot system phloem sap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025566

has super-classes: phloem sap^c

shoot system vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025205

has super-classes: vascular system^c; part_of^op some shoot system^c
has sub-classes: flower vascular system^c, inflorescence vascular system^c

shoot system xylem sap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025565

has super-classes: xylem sap^c

shoot-borne internode root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025593

has super-classes: shoot-borne root^c; develops_from^op some shoot axis internode^c
has sub-classes: basal root^c

shoot-borne nodal root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003005

has super-classes: shoot-borne root^c
has sub-classes: crown root^c, prop root^c, seminal root^c

shoot-borne root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000042

has super-classes: root^c; develops_from^op some shoot-borne root primordium^c
has sub-classes: shoot-borne internode root^c, shoot-borne nodal root^c, shoot-borne root spine^c

shoot-borne root apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006021

has super-classes: root apical meristem^c; part_of^op some shoot-borne root^c

shoot-borne root epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006039

is equivalent to: root epidermis^c and (part_of^op some shoot-borne root^c)
has super-classes: root epidermis^c; part_of^op some shoot-borne root^c

shoot-borne root primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025480

Transition from shoot-borne root primordium to shoot-borne root occurs with the formation of a root cap (PO:0020123), shortly after the development of a root apical meristem (PO:0020147).

has super-classes: root primordium^c

shoot-borne root spine^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030089

Shoot-borne root spines cannot grow indeterminately or supply the plant with water and solutes. See PO_REF:00015 for documentation of shoot-borne root spines in Acanthorhiza aculeata (Arecaceae).

has super-classes: shoot-borne root^c

shoot-borne shoot system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004545

has super-classes: shoot system^c
has sub-classes: axillary shoot system^c, epicormic shoot system^c

short cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004718

has super-classes: leaf pavement cell^c; part_of^op some vascular leaf^c
has sub-classes: epidermal cork cell^c, silica cell^c

short shoot^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004701

has super-classes: axillary shoot system^c

short tassel branch^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009102

has super-classes: b f o 0000004; tassel inflorescence branch^c; develops_from^op some short tassel branch meristem^c

short tassel branch meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009103

has super-classes: tassel inflorescence axillary meristem^c; part_of^op some long lateral tassel branch^c; part_of^op some first order tassel inflorescence axis^c

sieve cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025415

Sieve areas in sieve cells generally have narrow pores and thin connecting strands, and they are not highly specialized, but instead are fairly uniform throughout the cell wall. Typical of gymnosperms and non-seed vascular plants such as ferns. Differ from sieve tube elements, which have sieve plates and more pronounced specialization of sieve areas.

has super-classes: sieve element^c
has sub-classes: primary phloem sieve cell^c, secondary phloem sieve cell^c

sieve element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025406

Sieve elements function mainly in longitudinal conduction of organic solutes. Classified into sieve cells (PO:0025415) and sieve tube elements (PO:0000289) based on the presence of sieve plates and specialization of sieve areas in different parts of the cell. Develops from either a cambial initial (PO:0000295), a phloem mother cell (PO:0000400), or a cell of the procambium (PO:0025275).

has super-classes: native plant cell^c; part_of^op some phloem^c
has sub-classes: primary phloem sieve element^c, secondary phloem sieve element^c, sieve cell^c, sieve tube element^c
is disjoint with: leptoid^c

sieve tube^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025416

A sieve plate is part of a sieve tube member.

has super-classes: phloem^c

sieve tube element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000289

Sieve tube elements have sieve areas that are specialized into those with wide pores in sieve plates and those with narrow pores in lateral sieve areas. Sieve tube elements may have inclined end walls with compound or simple sieve plates. Typical of angiosperms. Differ from sieve cells (PO:0025415), which have less pronounced specialization of sieve areas and no sieve plates.

has super-classes: sieve element^c; part_of^op some sieve tube^c
has sub-classes: primary phloem sieve tube element^c, secondary phloem sieve tube element^c

silica cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004009

One of two types of short cells in the epidermis of grasses. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025).

has super-classes: short cell^c

silique fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030106

In contrast to legume fruit (PO:0030100), silique fruit develop from a syncarpous (multicarpellate) gynoecium (PO:0009062) separated by a false septum (replum, PO:0025267), which persists through fruit maturity. Examples: members of Brassicaceae, lyrate rockcress (Arabidopsis lyrata), mouse-ear cress (Arabidopsis thaliana), wild cabbage (Brassica oleracea), field mustard (Brassica rapa), and pink shepherd's purse (Capsella rubella).

has super-classes: fruit^c

silk^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006488

During pollination (GO:0009856), the pollen (PO:0025281) grows down through a portion of transmitting tissue (PO:0020102) to a plant ovary ovule (PO:0025490) and a megagametophyte (PO:0025279) to effect fertilization (GO:0009566). If you are annotating to this structure for Zea spp., please also add an annotation to the corresponding floret type. Choose the most specific term possible from: ear floret (PO:0006354), or one of the child terms: upper floret of pedicellate spikelet of ear (PO:0006350), or upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: collective organ part structure^c

silk scar^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0002004

has super-classes: cardinal part of multi-tissue plant structure^c; part_of^op some pericarp^c; part_of^op some fruit distal end^c

simple leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020042

has super-classes: vascular leaf^c

sixth order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025107

has super-classes: higher order inflorescence axis^c

sixth order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025116

has super-classes: higher order infructescence axis^c

socket cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000115

has super-classes: b f o 0000004; shoot epidermal cell^c; develops_from^op some epidermal initial cell^c
is disjoint with: epidermal pavement cell^c

somatic plant embryo^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025302

Somatic plant embryos may arise where embryos normally would not arise as a product of apomixis. They may occur on the edges of leaves on some species of Kalanchoe or some ferns.

has super-classes: plant embryo^c
has sub-classes: cultured somatic plant embryo^c, nucellar plant embryo^c

sorus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025359

has super-classes: collective plant organ structure^c; has_part^op some sporangium^c; part_of^op some vascular leaf^c

spadix inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030120

Examples include aroids (Araceae), palms (Arecaceae).

has super-classes: inflorescence^c

specialization zone formation^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001030

spermatogenous cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025525

In liverworts, hornworts and mosses the spermatogenous cell gives rise to a single, biflagellated, antheridium sperm cell (PO:0025120). In angiosperms please use the generative cell (PO:0020097) and in gymnosperms use the body cell (PO:0025526).

has super-classes: native plant cell^c; part_of^op some microgametophyte^c
has sub-classes: body cell^c, generative cell^c

spike inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030117

The basal-most flowers of some spike inflorescences have short inflorescence flower pedicels (PO:0009052), such as in ladies'-tresses orchids (Spiranthes; Orchidaceae). Examples include black pepper (Piper nigrum; Piperaceae).

has super-classes: inflorescence^c

spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009051

It consists of one to many closely-packed spikelet florets (PO:0009082) and associated glumes (PO:0009039).

has super-classes: reproductive shoot system^c; part_of^op some inflorescence^c
has sub-classes: ear spikelet^c, tassel spikelet^c

spikelet floret^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009082

A spikelet floret (PO:0009082) is enclosed by one or both the flower bracts (PO:0009034); lemma (PO:0009037) and palea (PO:0009038) and also includes a lodicule (PO:0009036). To describe a floret of the Asteraceae, use ray flower (PO:0025331) or disk flower (PO:0025332). Found in Poaceae, Cyperaceae and other Poales.

has super-classes: flower^c; part_of^op some spikelet^c
has sub-classes: ear floret^c, tassel floret^c

spikelet meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006327

has super-classes: inflorescence apical meristem^c; part_of^op some spikelet^c
has sub-classes: ear spikelet meristem^c, spikelet pair meristem^c, tassel spikelet meristem^c

spikelet pair meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006328

Found in some grass inflorescences.

has super-classes: spikelet meristem^c
has sub-classes: ear spikelet pair meristem^c, tassel spikelet pair meristem^c

spikelet pedicel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006319

This is not a pedicel in the strict sense, but is the ultimate naked part of the inflorescence axis.

has super-classes: higher order inflorescence axis^c; part_of^op some spikelet^c
has sub-classes: pedicel of ear spikelet^c, pedicel of tassel spikelet^c

spikelet rachilla^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009080

has super-classes: higher order inflorescence axis^c; part_of^op some spikelet^c
has sub-classes: ear spikelet rachilla^c, tassel spikelet rachilla^c

spine leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025173

spine petiole^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025613

The petiole (PO:0020038) abcisses longitudinally and the leaf lamina (PO:0020039) withers.

has super-classes: petiole^c

spine stipule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025174

spongy mesophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005647

has super-classes: mesophyll^c; part_of^op some leaf mesophyll^c; part_of^op some vascular leaf^c

spongy mesophyll cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006205

Usually found in the abaxial/lower part of the leaf mesophyll as in a dorsiventral leaf, but between two palisade parenchyma layers in an isobilateral leaf. If you are annotating to this term, please add an additional annotation to vascular leaf (PO:0009025) or non-vascular leaf (PO:0025075), depending on the species. All annotations for angiosperms, gymnosperms, and pteridophytes should go to vascular leaf and all annotations for bryophytes should go to non-vascular leaf.

has super-classes: mesophyll cell^c; part_of^op some spongy mesophyll^c

spongy mesophyll intercellular space^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025381

has super-classes: leaf mesophyll intercellular space^c; part_of^op some spongy mesophyll^c

sporangium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025094

In bryophytes, particularly in mosses, a sporangium is referred to as a capsule. In seed plants, a sporangium is located in a sporophyll. In pteridophytes, a sporangium is located on the surface of a sporophyll or fertile leaf or borne on a sporangiophore. May be unicellular in some algae.

has super-classes: b f o 0000002; plant organ^c; participates_in^op some sporophyte development stage^c
has sub-classes: megasporangium^c, microsporangium^c

sporangium base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030040

Term used for bryophytes and pteridophytes. The sporangium base is the sterile part of the sporangium below the sporangium theca. If swollen and distinct from the rest of the sporangium, it is called an apophysis or hypophysis.

has super-classes: cardinal organ part^c; part_of^op some sporangium^c

sporangium locule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025265

May be filled with spores.

has super-classes: locule^c; part_of^op some sporangium^c
has sub-classes: anther locule^c

sporangium theca^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030041

Term used for bryophytes and pteridophytes.

has super-classes: cardinal organ part^c; part_of^op some sporangium^c

sporangium wall^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025306

May have multiple layers such as exothecium, endothecium and tapetum. Early in development, the sporangium wall bounds the archesporium. Later, after spores develop from the archesporium, it bounds the spore or spores.

has super-classes: cardinal organ part^c; part_of^op some sporangium^c
has sub-classes: megasporangium wall^c, microsporangium wall^c

sporangium wall endothecium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030049

Term used for vascular plants to describe the outermost layer of a sporangium wall that is internal to the exothecium.

has super-classes: portion of ground tissue^c; part_of^op some sporangium wall^c; adjacent_to^op some exothecium^c
has sub-classes: megasporangium endothecium^c, microsporangium endothecium^c
is disjoint with: protosporangium endothecium^c

spore capsule annulus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025093

Found in bryophytes. The capsule annulus is located at the base of an operculum. Upon capsule maturation, cell separation in the annulus allows the operculum to separate from the capsule, aiding in spore dispersal.

has super-classes: dehiscence zone^c; part_of^op some sporangium^c

spore capsule calyptra^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030037

Found in bryophytes. The spore capsule calyptra is a membranous or hairy cap or hood, composed of gametophytic tissue (venter; PO:0030038) that protects the embryonic sporophyte within the archegonium (PO:0025126). In some species, it may persist after the sporophyte develops and gets carried upward as the seta (PO:0030032) elongates. The spore capsule calyptra is usually lost before the spores are released, and its shape can be used for identification purposes.

has super-classes: b f o 0000004; cardinal organ part^c; participates_in^op some gametophyte development stage^c; develops_from^op some archegonium^c

spore capsule columella^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025231

Found in bryophytes.

has super-classes: columella^c; part_of^op some sporangium^c

spore capsule mouth^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030017

May be covered by a peristome.

has super-classes: plant anatomical space^c; part_of^op some sporangium^c

spore capsule operculum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030044

Found in mosses. May remain partly attached to the rest of the capsule.

has super-classes: cardinal organ part^c; part_of^op some sporangium^c
is disjoint with: fruit operculum^c

spore capsule valve^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025229

Found in bryophytes. A spore capsule may dehisce ongitudinally, forming evenely sized valves, or it may dehisce at the capsule annulus, forming the operculum, which is a specialized type of valve.

has super-classes: valve^c; part_of^op some sporangium^c

sporocyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006204

has super-classes: b f o 0000004; native plant cell^c; develops_from^op some archesporial cell^c; part_of^op some sporangium^c
has sub-classes: megasporocyte^c, microsporocyte^c

sporophyll^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009026

has super-classes: phyllome^c
has sub-classes: megasporophyll^c, microsporophyll^c

sporophyll margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025016

has super-classes: phyllome margin^c; part_of^op some sporophyll^c
has sub-classes: carpel margin^c, stamen margin^c

sporophyte^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009003

Replace_by whole plant (PO: PO:0000003) in the sporophyte development phase (PO:0028003). Structures that only occur in sporophyte should have participates_in relation to sporophytic development phase.

sporophyte development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0028002

A whole plant (PO:0000003) in the sporophyte development stage usually has twice the chromosome complement of a plant in the gametophytic phase, but may not in the case of apogamy. Examples of apogamy include both naturally occurring instances (such as sporophytes arising form haploid cells as in bryophytes or ferns) as well as in vitro instances (such as haploid embryo culture or in vitro fusion of non-gamete cells or protoplasts). During the sporophyte development stage, a plant may produce meiospores by meiosis.

has super-classes: whole plant development stage^c; part_of^op some life of whole plant stage^c
has sub-classes: plant zygote stage^c, sporophyte dormant stage^c, sporophyte reproductive stage^c, sporophyte senescent stage^c, sporophyte vegetative stage^c

sporophyte dormant stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007132

A dormancy process (GO:0022611) is a developmental process in which dormancy (sometimes called a dormant state) is induced, maintained or broken. Dormancy is a suspension of most physiological activity and growth that can be reactivated. This term only applies to a whole plant in the sporophyte stage, not to the dormant stage of a seed, bud, or other plant structure. Dormancy of a plant may be preceded by the senescence of its parts such as leaves in woody plants or most of the shoot system herbaceous perennials and by the formation of dormant buds. The end of dormancy in a sporophyte is marked by resumed growth of buds and/or growth of vascular cambium. The dormant stage may be a response to environmental conditions such as seasonality or extreme heat, drought, or cold. Examples of a sporophyte dormant stage are the resurrection plants Selaginella lepidophylla (a lycopod) and Craterostigma plantagineum (an angiosperm) while they are dessicated, and deciduous woody plants and herbaceous perennials or biennials that have a dormant stage in response to drought or cold.

has super-classes: sporophyte development stage^c
has sub-classes: plant embryo dormant stage^c

sporophyte foot^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030029

Found in bryophytes and some pteridophytes. In mosses, the foot is located below the seta. In ferns, the foot is formed from the upper hypobasal quandrant of the embryo. The sporophyte foot serves for both attachment and absorption. The outer portion of the foot is composed of absorptive transfer cells.

has super-classes: b f o 0000002; plant organ^c; has_part^op some transfer cell^c; participates_in^op some sporophyte development stage^c

sporophyte meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030015

Occurs in pteridophytes and the sporophyte of bryophytes.

is equivalent to: meristematic apical cell^c and (participates_in^op some sporophyte development stage^c)
has super-classes: b f o 0000002; meristematic apical cell^c; participates_in^op some sporophyte development stage^c
has sub-classes: embryo apical cell^c, root meristematic apical cell^c, vascular shoot axis meristematic apical cell^c

sporophyte reproductive stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007130

A whole plant may continue developmental vegetative growth (GO:0080186) after it has entered the reproductive stage, and it may revert to a stage in which it is no longer producing sporangia, but once it has initiated a single sporangium, it remains in the reproductive stage until senescence or death by some other cause.

has super-classes: sporophyte development stage^c
has sub-classes: whole plant flowering stage^c, whole plant fruit development stage^c, whole plant inflorescence detectable stage^c

sporophyte senescent stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007017

The sporophyte senescent stage is often preceded by the sporophyte reproductive stage, and it ends with death of the sporophyte, either as a result of senescence or some other cause. The sporophyte senescent stage may succeed the sporophyte reproductive stage in monocarpic plants that die after reproducing, such as annuals. This stage is distinct from sporophyte dormant stage, in which organs may senesce, but some parts of the plant remain alive. Multicellular organism senescence/aging (GO:0010259) includes loss of functions such as resistance to disease, homeostasis, and fertility, as well processes like cellular senescence, organ senescence, and wear and tear. The POC curators have requested to the GOC that they revise the definition of GO:0010259, to make it more appropriate for plants.

has super-classes: sporophyte development stage^c

sporophyte vegetative stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007134

Succeeds a plant zygote stage (PO:0001097). A sporophyte may begin to senesce or die from other causes before producing sporangia. Developmental vegetative growth (GO:0080186) can also occur during the reproductive stage.

has super-classes: sporophyte development stage^c; preceded_by^op some plant zygote stage^c
has sub-classes: 1 main shoot growth stage^c, 2 formation of axillary shoot stage^c, coleoptile emergence stage^c, plant embryo development stage^c, seed germination stage^c, seedling development stage^c

stalk^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025066

Some stalks may be ridged or grooved.

has super-classes: cardinal organ part^c
has sub-classes: antheridiophore^c, antheridium stalk^c, archegoniophore^c, archegonium stalk^c, filament^c, funicle^c, leaf rachis^c, petiole^c, petiolule^c, seta^c

stamen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009029

Part of tassel floret.

has super-classes: microsporophyll^c; floral organ^c; part_of^op some androecium^c; develops_from^op some stamen primordium^c

stamen anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025486

has super-classes: phyllome anlagen^c

stamen epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025097

is equivalent to: phyllome epidermis^c and (part_of^op some stamen^c)
has super-classes: phyllome epidermis^c; part_of^op some stamen^c
has sub-classes: anther wall exothecium^c, filament epidermis^c, stamen stomatal complex^c

stamen margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025020

Only flattened stamens can have a margin.

has super-classes: sporophyll margin^c; part_of^op some stamen^c

stamen primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004705

has super-classes: phyllome primordium^c; floral organ primordium^c; develops_from^op some stamen anlagen^c

stamen primordium visible stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007613

has super-classes: androecium development stage^c

stamen stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025220

has super-classes: stamen epidermis^c; phyllome stomatal complex^c

stamen trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025209

has super-classes: phyllome trichome^c; part_of^op some stamen epidermis^c

stamen vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005018

has super-classes: phyllome vascular system^c; part_of^op some flower vascular system^c; part_of^op some stamen^c

staminate flower^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025600

has super-classes: flower^c
has sub-classes: tassel floret^c

staminate inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025601

has super-classes: inflorescence^c; has_part^op some staminate flower^c
has sub-classes: tassel inflorescence^c

staminode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009077

has super-classes: microsporophyll^c; floral organ^c; part_of^op some androecium^c

starch sheath cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000020

Uninformative definition

statolith^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020134

This is sub-cellular term

stele^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025197

If a pith is present, it is part of the stele, otherwise the stele only includes the primary vascular tissue and the ground tissue that surrounds it.

has super-classes: cardinal organ part^c; part_of^op some plant axis^c
has sub-classes: root stele^c, shoot axis stele^c

stem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009047

A stem often bears leaves and buds. It is usually above ground, and is more or less negatively geotropic.

has super-classes: shoot axis^c
has sub-classes: gametophore stem^c

stem aerenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006214

has super-classes: aerenchyma^c; part_of^op some stem^c

stem apex tendril^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025365

Aids plant in climbing. May be branched, may have adhesive disks at its distal end, may be woody, and may bear small leaves. A stem apex tendril differs from a branch tendril in that it arises from the shoot apical meristem, rather than in an axil. However, a shoot apex tendril may arise either from the apex itself, in which case it is terminal, or from the side of an apical meristem, in which case it is a lateral structure. In the latter case, the main stem of the plant undergoes sympodial growth. A stem apex tendril is often located on the opposite side of a stem from a leaf at the same node, as in Vitaceae. See also leaf tendril (PO:0025361), leaflet tendril (PO:0025362), leaf apex tendril (PO:0025363), branch tendril (PO:0025364), leaf rachis tendril (PO:0025366), and prophyll tendril (PO:0025365). Careful observation is required to correctly classify some tendrils.

has super-classes: shoot axis^c

stem base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008039

has super-classes: cardinal organ part^c; part_of^op some stem^c

stem cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025612

is equivalent to: shoot axis cortex^c and (part_of^op some stem^c)
has super-classes: shoot axis cortex^c; part_of^op some stem^c

stem elongation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007089

A measure of vegetative growth, but leaf production is to be preferred.

has super-classes: 1 main shoot growth stage^c
has sub-classes: SE.00 stem elongation begins stage^c, SE.01 one node or internode visible stage^c, SE.02 two nodes or internodes visible stage^c, SE.03 three nodes or internodes visible stage^c, SE.04 four nodes or internodes visible stage^c, SE.05 five nodes or internodes visible stage^c, SE.06 six nodes or internodes visible stage^c, SE.07 seven nodes or internodes visible stage^c, SE.08 eight nodes or internodes visible stage^c, SE.09 nine nodes or internodes visible stage^c, SE.10 ten nodes or internodes visible stage^c, SE.11 eleven nodes or internodes visible stage^c, SE.12 twelve nodes or internodes visible stage^c, SE.13 thirteen nodes or internodes visible stage^c, SE.14 fourteen nodes or internodes visible stage^c, SE.15 fifteen nodes or internodes visible stage^c, SE.16 sixteen or more nodes or internodes visible stage^c, SE.97 flag leaf visible stage^c, SE.99 maximum stem length reached stage^c

stem epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025178

is equivalent to: shoot axis epidermis^c and (part_of^op some stem^c)
has super-classes: shoot axis epidermis^c; part_of^op some stem^c
has sub-classes: hypocotyl epidermis^c

stem hypodermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025610

has super-classes: shoot axis hypodermis^c; part_of^op some stem cortex^c

stem intercalary meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006347

Results in an increase in length of a stem internode, as part of primary growth.

has super-classes: intercalary meristem^c; part_of^op some stem internode^c

stem internode^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020142

See node.

has super-classes: shoot axis internode^c; part_of^op some stem^c
has sub-classes: epicotyl^c, hypocotyl^c, mesocotyl^c

stem internode differentiation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008042

Primary, not secondary, tissue differentiation occurs in a differentiation zone.

has super-classes: shoot internode differentiation zone^c; part_of^op some stem internode^c

stem internode elongation zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008041

has super-classes: shoot axis internode elongation zone^c; part_of^op some stem internode^c

stem node^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020141

has super-classes: shoot axis node^c; part_of^op some stem^c
has sub-classes: cotyledonary node^c, scutellar node^c

stem procambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025273

has super-classes: shoot axis procambium^c

stem secondary thickening meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025442

is equivalent to: secondary thickening meristem^c and (part_of^op some stem^c)
has super-classes: secondary thickening meristem^c; part_of^op some stem^c

stem stele^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025200

has super-classes: shoot axis stele^c; part_of^op some stem^c

stem tegument layer^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025611

has super-classes: shoot axis tegument layer^c; has_part^op some stem hypodermis^c; has_part^op some stem epidermis^c

stem trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025176

has super-classes: shoot axis trichome^c; part_of^op some stem epidermis^c

stereid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030045

Found only in bryophytes in gametophore axes, setae, or leaves. Functions in support rather than conduction. May or may not retain a living protoplast at maturity.

has super-classes: ground tissue cell^c; part_of^op some stereome^c

stereome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030050

A stereome is composed of only stereids. Found only in bryophytes in gametophore axes or non-vascular leaves. May function in support.

has super-classes: portion of ground tissue^c

sterile lemma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009040

An undeveloped androecium or gynoecium may or may not be detectable. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding spikelet type, if known. Choose the most specific term possible from: ear spikelet (PO:0006320), ear pedicellate spikelet (PO:0006348), ear sessile spikelet (PO:0006349), tassel spikelet (PO:0006309), tassel pedicellate spikelet (PO:0006312), tassel sessile spikelet (PO:0006311).

has super-classes: lemma^c

stigma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009073

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: cardinal organ part^c; part_of^op some carpel^c

stigma cell differentiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004503

has super-classes: gynoecium development stage^c

stigma epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006061

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: carpel epidermis^c; part_of^op some stigma^c

stigma papilla cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025168

See stigma papilla (GO:0090397) for the subcellular component stigma papilla.

has super-classes: papilla cell^c; part_of^op some stigma epidermis^c

stigma vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008012

has super-classes: vascular system^c; part_of^op some carpel vascular system^c; part_of^op some stigma^c

stipel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020051

has super-classes: cardinal organ part^c; part_of^op some leaflet^c

stipule^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020041

Usually one of a pair of appendages. May take the form of a spine (PO:0025174) or may be bristled or brush-like. Stipules may occur on the opposite side of the shoot axis from the leaf they are associated with, but they are still thought to arise from part of the leaf.

has super-classes: cardinal organ part^c; part_of^op some vascular leaf^c
has sub-classes: spine stipule^c

stolon^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003024

The stolon develops from an axillary bud (PO:0004709) and produces adventitious roots (PO:0003005) at the nodes and a terminal aerial stem. That stem then sends out one or more stolons from its axillary buds and the process is reiterated. Stolons may be above ground, as with strawberries, or below ground as in potatoes.

has super-classes: branch^c

stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0002000

has super-classes: shoot system epidermis^c
has sub-classes: phyllome stomatal complex^c

stomatal initial cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000062

has super-classes: epidermal initial cell^c

stomatal pore^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008032

The size of the stomatal pore is variable and controlled by movement of the guard cells in response to environmental cues.

has super-classes: plant anatomical space^c; part_of^op some stomatal complex^c
has sub-classes: phyllome stomatal pore^c

stomium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020101

Pollen may be released through the stomium. If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), tassel floret (PO:0006310), lower floret of pedicellate spikelet of tassel (PO:0006313), lower floret of sessile spikelet of tassel (PO:0006315), upper floret of pedicellate spikelet of tassel (PO:0006314), upper floret of sessile spikelet of tassel (PO:0006316).

has super-classes: plant anatomical space^c; part_of^op some anther wall^c

storage parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025035

This tissue could be found in any organ, but often occurs in fruits or tubers. New GO term carbohydrate storage has been requested.

has super-classes: parenchyma^c
has sub-classes: fruit storage parenchyma^c, seed storage parenchyma^c, tuber storage parenchyma^c

strobilus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025083

May be simple or compound. Found in lycophytes such as Selaginella and Lycopodium, sphenophytes such as Equisetum, gymnosperms such as cycad, conifers, gnetophytes and the pollen producing structures of Gingko. The term cone is often used for strobili that are woody. Flowers are sometimes considered bisexual strobili. Some flowering plants such as Alnus have inflorescences called catkins that resemble strobili, but are not.

has super-classes: reproductive shoot system^c
has sub-classes: megasporangiate strobilus^c, microsporangiate strobilus^c

strobilus bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025085

has super-classes: reproductive bud^c
has sub-classes: axillary strobilus bud^c, terminal strobilus bud^c

strophiole^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0019023

has super-classes: arilloid^c; part_of^op some seed raphe^c

style^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009074

If you are annotating to this structure for grasses, please also add an annotation to spikelet floret (PO:0009082). For Zea spp. please use silk (PO:0006488).

has super-classes: cardinal organ part^c; part_of^op some carpel^c

style epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006062

If you are annotating to this structure for Zea mays or other grasses, please also add an annotation to the corresponding floret type. Choose the most specific term possible from: spikelet floret (PO:0009082), ear floret (PO:0006354), upper floret of pedicellate spikelet of ear (PO:0006350), upper floret of sessile spikelet of ear (PO:0006352).

has super-classes: carpel epidermis^c; part_of^op some style^c

subsidiary cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000284

has super-classes: shoot epidermal cell^c; part_of^op some stomatal complex^c
is disjoint with: epidermal pavement cell^c

substomatal cavity^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025382

has super-classes: b f o 0000004; intercellular space^c; adjacent_to^op some stomatal pore^c
has sub-classes: phyllome substomatal cavity^c

subterranean shoot axis tuber^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004547

has super-classes: shoot axis tuber^c

subterranean tuber axillary bud meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025070

has super-classes: shoot axis tuber axillary bud meristem^c; part_of^op some subterranean shoot axis tuber^c

subterranean tuber axillary shoot^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025081

See also subterranean tuber axillary bud (PO:0025042).

has super-classes: tuber axillary shoot^c; part_of^op some subterranean shoot axis tuber^c

subterranean tuber axillary vegetative bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025042

A structure on the tuber surface that can sprout. In potatoes, axillary vegetative buds (eyes) can determine processing quality. Scale that the breeders use to rate the buds/sprouts of tubers: 1. none, 2. swollen eye, 3. sprout ca. 1/4 inch, 4. sprout ca. 1/2 inch, 5. sprout ca. 1 inch, 6. sprout ca. 2 inch, 7. sprout ca. 3 inch, 8. new top growth, 9. chain tubers.

has super-classes: shoot axis tuber axillary vegetative bud^c; part_of^op some subterranean shoot axis tuber^c

subterranean tuber cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025057

is equivalent to: tuber cortex^c and (part_of^op some subterranean tuber storage parenchyma^c)
has super-classes: tuber cortex^c; part_of^op some subterranean tuber storage parenchyma^c

subterranean tuber epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025048

The skin of young potatoes is epidermis while the skin of mature potatoes is periderm.

has super-classes: shoot axis tuber epidermis^c; part_of^op some subterranean shoot axis tuber^c

subterranean tuber interfascicular region^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025049

Because subterranean interfascicular regions in potato tubers form before the subterranean tuber perimedullary zone expands (PO:0025063), in mature potato tubers, the subterranean tuber interfascicular regions persist as rays that extend from the central pith to the eyes or subterranean tuber axillary vegetative buds (PO:0025042).

has super-classes: tuber interfascicular region^c; part_of^op some subterranean tuber storage parenchyma^c

subterranean tuber periderm^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025045

The skin of young potatoes is epidermis while the skin of mature potatoes is periderm.

has super-classes: shoot axis tuber periderm^c; part_of^op some subterranean shoot axis tuber^c

subterranean tuber perimedullary zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025063

has super-classes: tuber perimedullary zone^c; part_of^op some subterranean tuber pith^c

subterranean tuber pith^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025053

In potatoes, this is part of the flesh.

has super-classes: tuber pith^c; part_of^op some subterranean tuber storage parenchyma^c

subterranean tuber storage parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025038

This term is used to refer to potato tuber flesh. See part_of children for individual components of subterranean tuber flesh.

has super-classes: tuber storage parenchyma^c; part_of^op some subterranean shoot axis tuber^c

suspensor^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020108

The suspensor often allows the embryo to penetrate deep into the endosperm. Across plant species, suspensors are morphologically diverse and may be single- or multicellular, undifferentiated or highly differentiated, and variously shaped.

has super-classes: b f o 0000004; embryo plant structure^c; develops_from^op some embryo basal cell^c

synergid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000191

has super-classes: embryo sac cell^c; part_of^op some egg apparatus^c

tapetum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025313

May function in providing nutrition to developing sporocytes or pollen. May have one or more layers of cells. May break down as spores mature. A tapetum does not develop in some plants, such as Psilotum. In angiosperms, the tapetum develops from one of the parietal layers. In non-seed plants, the tapetum may develop from the outer cells of archesporium or from the inner-most layer of the sporangium wall. The tapetum may be one of two types ameboid or secretory/glandular.

has super-classes: portion of ground tissue^c; part_of^op some sporangium wall^c
has sub-classes: megasporangium tapetum^c, microsporangium tapetum^c

tapetum cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025543

The tapetum is the inner-most layer of a sporangium wall (PO:0025306).

has super-classes: native plant cell^c; part_of^op some tapetum^c
has sub-classes: megasporangium tapetum cell^c, microsporangium tapetum cell^c

tassel apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006376

has super-classes: tassel meristem^c; inflorescence apical meristem^c; part_of^op some first order tassel inflorescence axis^c

tassel floret^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006310

The tassel floret (PO:0006310) initiates both stamens (PO:0009029) and carpels (PO:0009030), but all carpels abort during development. Found in Zea spp.

has super-classes: spikelet floret^c; staminate flower^c; part_of^op some tassel spikelet^c
has sub-classes: lower floret of pedicellate spikelet of tassel^c, lower floret of sessile spikelet of tassel^c, upper floret of pedicellate spikelet of tassel^c, upper floret of sessile spikelet of tassel^c

tassel inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020126

Branched inflorescence with a central axis and about 10-50 lateral branches.

has super-classes: staminate inflorescence^c

tassel inflorescence axillary meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009107

has super-classes: inflorescence axillary meristem^c; tassel meristem^c
has sub-classes: long lateral tassel branch meristem^c, short tassel branch meristem^c, tassel spikelet pair meristem^c

tassel inflorescence branch^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006323

has super-classes: higher order inflorescence axis^c; part_of^op some tassel inflorescence^c
has sub-classes: long lateral tassel branch^c, short tassel branch^c, tassel spikelet rachilla^c

tassel meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009106

is equivalent to: inflorescence meristem^c and (part_of^op some tassel inflorescence^c)
has super-classes: inflorescence meristem^c; part_of^op some tassel inflorescence^c
has sub-classes: tassel apical meristem^c, tassel inflorescence axillary meristem^c, tassel spikelet meristem^c

tassel pedicellate spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006312

Develops from the tassel spikelet pair meristem (PO:0006358).

has super-classes: tassel spikelet^c

tassel peduncle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006417

has super-classes: peduncle^c; part_of^op some tassel inflorescence^c

tassel sessile spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006311

Develops from the tassel spikelet pair meristem (PO:0006358).

has super-classes: tassel spikelet^c

tassel spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006309

has super-classes: b f o 0000004; spikelet^c; develops_from^op some tassel spikelet pair meristem^c; part_of^op some tassel inflorescence^c
has sub-classes: tassel pedicellate spikelet^c, tassel sessile spikelet^c

tassel spikelet meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006377

has super-classes: spikelet meristem^c; tassel meristem^c

tassel spikelet pair meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006358

has super-classes: spikelet pair meristem^c; tassel inflorescence axillary meristem^c; part_of^op some short tassel branch^c

tassel spikelet rachilla^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006379

has super-classes: tassel inflorescence branch^c; spikelet rachilla^c; part_of^op some tassel spikelet^c
has sub-classes: rachilla of pedicellate spikelet of tassel^c, rachilla of sessile spikelet of tassel^c

tectum^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020013

This term is now available in the cellular_component aspect of the Gene Ontology, GO:0043676,

tegmen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020056

has super-classes: portion of plant tissue^c; part_of^op some seed coat^c

tension wood^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025474

Develops as a response to gravity (tension) and may function in restoring a stem (PO:0009047) or branch (PO:0025073) that is leaning to its original position. Found in angiosperms. Secondary xylem tracheary elements (PO:0025445) in tension wood are often longer than the tracheary elements in non-tension wood of the same plant. The gelatinous fiber cells found in reaction wood have a cell wall inner layer (G layer) that contains abundant cellulose and is poor in lignin.

has super-classes: reaction wood^c

tenth order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025111

Tenth order inflorescence axis (PO:0025111) is the greatest specific inflorescence axis order in the PO; when mapping annotations to inflorescence axes which are of an order greater than ten, or when order is ambiguous or unknown, annotate directly to higher order inflorescence axis (PO:0009081).

has super-classes: higher order inflorescence axis^c

tenth order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025255

Tenth order infructescence axis (PO:0025112) is the greatest specific infructescence axis (PO:0025242) order in the PO; when mapping annotations to an infructescence axis which is of an order higher than ten, or when order is ambiguous or unknown, annotate directly to higher order infructescence axis (PO:0025243).

has super-classes: higher order infructescence axis^c

tepal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009033

There is no differentiation between the petals (PO:0009032) and the sepals (PO:0009031) in color, placement, and size (e.g. some species of Magnolia).

has super-classes: phyllome^c; floral organ^c; part_of^op some collective tepal structure^c
has sub-classes: free tepal^c, fused tepal^c

tepal abaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025192

has super-classes: tepal epidermis^c

tepal adaxial epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025193

has super-classes: tepal epidermis^c

tepal apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025143

It is not precisely defined how far toward the base from the tip a tepal apex extends. For the apical most portion of a tepal, use the term tepal tip.

has super-classes: phyllome apex^c; part_of^op some tepal^c

tepal base^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025148

has super-classes: phyllome base^c; part_of^op some tepal^c

tepal epidermis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025184

is equivalent to: phyllome epidermis^c and (part_of^op some tepal^c)
has super-classes: phyllome epidermis^c; part_of^op some tepal^c
has sub-classes: tepal abaxial epidermis^c, tepal adaxial epidermis^c, tepal stomatal complex^c

tepal margin^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025015

has super-classes: phyllome margin^c; part_of^op some tepal^c

tepal stomatal complex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025221

has super-classes: tepal epidermis^c; phyllome stomatal complex^c

tepal tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025151

This term is to be used for only the apical most portion of a tepal. For a larger area, use the term tepal apex. Use this term when describing the shape of a tepal tip.

has super-classes: phyllome tip^c; part_of^op some tepal apex^c

tepal trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025188

has super-classes: phyllome trichome^c; part_of^op some tepal epidermis^c

tepal vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025207

has super-classes: phyllome vascular system^c; part_of^op some flower vascular system^c; part_of^op some tepal^c

terete vascular leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025334

The surface of a terete leaf corresponds to either the adaxial or abaxial surface of a normal leaf.

has super-classes: unifacial vascular leaf^c

terminal bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004713

has super-classes: bud^c
has sub-classes: terminal reproductive bud^c, terminal vegetative bud^c

terminal flower bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004714

has super-classes: flower bud^c; terminal reproductive bud^c

terminal inflorescence bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004715

has super-classes: inflorescence bud^c; terminal reproductive bud^c

terminal reproductive bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025071

has super-classes: terminal bud^c; reproductive bud^c
has sub-classes: terminal flower bud^c, terminal inflorescence bud^c, terminal strobilus bud^c

terminal strobilus bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025077

has super-classes: terminal reproductive bud^c; strobilus bud^c

terminal vegetative bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004716

has super-classes: vegetative bud^c; terminal bud^c

tertiary leaf vein^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008021

Vein orders only apply to hierarchically branching vein patterns, not to dichotomously branching vein patterns, as found in some ferns and gymnosperms.

has super-classes: leaf lamina vein^c

testa^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0020057

has super-classes: portion of plant tissue^c; part_of^op some seed coat^c

tetrad of megaspores^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025227

Usually only one of the four megaspores develops and the other three die.

has super-classes: b f o 0000004; portion of plant tissue^c; develops_from^op some megasporocyte^c; has_part^op some megaspore^c

tetrad of microspores^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000032

has super-classes: b f o 0000004; portion of plant tissue^c; has_part^op some microspore^c; develops_from^op some microsporocyte^c

tetrarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025561

has super-classes: root system exarch protoxylem^c

thallus^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030027

A thallus is a gametophyte of liverworts and pteridophytes and develops from a short-lived protonema. Roughly two dimensional growth results from division of a single apical cell. Thalli may be ribbon or heart shaped or almost filamentous. Although there are no distinct organs, there may be tissue differentiation and dichotomous branching.

has super-classes: b f o 0000002; whole plant^c; participates_in^op some gametophyte development stage^c

thallus meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030025

has super-classes: gametophyte meristematic apical cell^c; part_of^op some thallus^c

thallus reproductive whole plant development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025346

has super-classes: gametophyte reproductive stage^c

thallus vegetative whole plant development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025347

May succeed a protonema whole plant development stage or may directly succeed spore germination.

has super-classes: gametophyte vegetative stage^c

third order inflorescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006322

has super-classes: higher order inflorescence axis^c

third order infructescence axis^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025113

has super-classes: higher order infructescence axis^c

thorn^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025172

A thorn is a short, pointed (PATO:0002258) woody structure, may be branched.

has super-classes: branch^c

tile cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004530

has super-classes: upright ray secondary xylem parenchyma cell^c

tmema^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030061

Found in bryophytes at the base of a gemma (PO:0025614). Participates in abscission of the gemma.

has super-classes: b f o 0000002; portion of plant tissue^c; participates_in^op some gametophyte development stage^c; has_part^op some tmema cell^c

tmema cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030059

May be a single cell adjacent to a brachycyte (PO:0030058) or part of a portion of tmema tissue.

has super-classes: b f o 0000002; native plant cell^c; participates_in^op some gametophyte development stage^c

tracheary element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000290

Tracheary elements are dead at maturity, are more or less elongated, and have pits of various types in the cell wall. Tracheary elements function in the conduction of water and dissolved substances such as mineral nutrients from the roots to the shoot system. Tracheary elements can be distinguished from fiber cells (PO:0025407) by the presence of bordered pits, although there are intermediate forms called fiber tracheids (PO:0000355).

has super-classes: native plant cell^c; part_of^op some xylem^c
has sub-classes: primary xylem tracheary element^c, secondary xylem tracheary element^c, tracheid^c, xylem vessel member^c
is disjoint with: hydroid^c

tracheary element death stage of secondary xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025467

During this stage, the tracheary elements and non-septate xylem fiber cells of a portion of secondary xylem (PO:0005848) undergo cell death (GO:0008219), but most of the secondary xylem parenchyma cells (PO:0004525) and septate xylem fiber cells (septate fiber tracheid, PO:0025419, and septate libriform fiber cell, PO:0025420) remain alive. Precedes a secondary xylem parenchyma cell death stage of secondary xylem (PO:0025468).

has super-classes: cell death stage of secondary xylem^c

tracheid^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000301

May have any of the kinds of secondary wall thickenings found in tracheary elements. The area of contact between two tracheids has only bordered pits, whereas in vessel members (PO:0002003), it has openings in the cell wall called perforations, organized into perforation plates (term has been requested in GO).

has super-classes: tracheary element^c
has sub-classes: primary xylem tracheid^c, secondary xylem tracheid^c

tracheid bar^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0019026

Found some taxa, such as Phaseolus.

has super-classes: b f o 0000004; xylem^c; adjacent_to^op some hilum^c; part_of^op some seed^c

transfer cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000078

Appear to be specialized for short-distance transfer of solutes. Transfer cells can occur anywhere there is a junction between two individuals, such as between a sporophyte and a gametophyte, or between a parasitic plant and its host.

has super-classes: ground tissue cell^c
has sub-classes: basal endosperm transfer cell^c, transfer companion cell^c

transfer companion cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025458

Plasmodesmata between a transfer companion cell and adjacent mesophyll cells may be few in number. Transfer companion cells are found in plants that use apoplastic phloem loading. Unlike sieve tube elements (PO:0000289), transfer companion cells retain their nuclei and other organelles at maturity.

has super-classes: companion cell^c; transfer cell^c

transition phyllode leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025336

Common in seedlings of legumes of the genus Acacia. May also occur later, after the plant has begun to produce phyllodes.

has super-classes: transition vascular leaf^c; ensiform vascular leaf^c

transition vascular leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008018

Many species have juvenile leaves at the base of the stem, adult leaves at the apex, and transition leaves in between. In maize, juvenile leaves are at the tip of the stalk (stem), which differentiates first, with adult leaves at the base, while other grasses may have other arrangements. Transition leaves may have mosaics of juvenile and adult tissues, as in Brachypodium.

has super-classes: vascular leaf^c
has sub-classes: transition phyllode leaf^c

transition zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0003000

has super-classes: cardinal organ part^c; part_of^op some root^c

triarch protoxylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025560

has super-classes: root system exarch protoxylem^c

trichoblast^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000262

has super-classes: b f o 0000004; root epidermal cell^c; develops_from^op some epidermal initial cell^c

trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000282

This class is the union of unicellular trichome (PO:0025537) and multicellular trichome (PO:0025162). A trichome can vary in length and shape and may be branched or unbranched. It may be glandular or non-secretory.

has super-classes: b f o 0000004; plant structure^c; develops_from^op some epidermal initial cell^c; part_of^op some epidermis^c
has sub-classes: glandular trichome^c, multicellular trichome^c, phyllome trichome^c, seed trichome^c, shoot axis trichome^c, unicellular trichome^c

trichome apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025550

This term is the parent to the apex of a multicellular trichome (PO:0025162) or a unicellular trichome (PO:0025537), specifically, a multicellular trichome apex (PO:0025551) and an unicellular trichome apex (GO:0090552) which is a GO cellular component term.

has super-classes: plant structure^c; part_of^op some trichome^c
has sub-classes: multicellular trichome apex^c

trichome branch^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008031

This term was made obsolete because it is a sub-cellular component. New term unicellular trichome branch (GO:0090405) has been added to GO. For cell that is a branch of a multicellular trichome, see multicellular trichome branch cell (PO:0025163).

trichome cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008030

has super-classes: b f o 0000004; native plant cell^c; part_of^op some multicellular trichome^c; develops_from^op some epidermal cell^c
has sub-classes: axillary hair basal cell^c, axillary hair terminal cell^c, multicellular trichome branch cell^c
is disjoint with: epidermal pavement cell^c

trichome development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025368

has super-classes: b f o 0000003; plant structure development stage^c; has_participant^op some trichome^c
has sub-classes: leaf trichome development stage^c, seed trichome development stage^c

trichome tip^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025549

This term is the parent to the tip of a multicellular trichome (PO:0025162) or the tip of a unicellular trichome (PO:0025537), specifically, a multicellular trichome tip (PO:0025535) and a unicellular trichome tip (GO:0090553), which is a GO cellular component term.

has super-classes: plant structure^c; part_of^op some trichome apex^c
has sub-classes: multicellular trichome tip^c

tuber^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025522

Functions in storage of photosynthate metabolites. May develop from a branch (PO:0025073) or a root (PO:0009005). If you are annotating to tuber, you should pick the more specific child term: shoot axis tuber (PO:0004543) or tuberous root tuber (PO:0025476).

has super-classes: plant axis^c
has sub-classes: shoot axis tuber^c, tuberous root tuber^c

tuber axillary shoot^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025003

has super-classes: axillary shoot system^c
has sub-classes: aerial tuber axillary shoot^c, subterranean tuber axillary shoot^c

tuber cortex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025055

has super-classes: cortex^c; part_of^op some tuber storage parenchyma^c
has sub-classes: aerial tuber cortex^c, subterranean tuber cortex^c

tuber interfascicular region^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025050

has super-classes: interfascicular region^c; part_of^op some tuber storage parenchyma^c
has sub-classes: aerial tuber interfascicular region^c, subterranean tuber interfascicular region^c

tuber perimedullary zone^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025061

has super-classes: shoot axis perimedullary zone^c; part_of^op some tuber pith^c
has sub-classes: aerial tuber perimedullary zone^c, subterranean tuber perimedullary zone^c

tuber pith^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025052

has super-classes: pith^c; part_of^op some tuber storage parenchyma^c
has sub-classes: aerial tuber pith^c, subterranean tuber pith^c

tuber storage parenchyma^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025036

This is the flesh of a tuber. See part_of children for individual components of tuber flesh. If you are annotating to this term, please add an additional annotation to either shoot axis tuber (PO:0004543) or tuberous root tuber (PO:0025476).

has super-classes: storage parenchyma^c; part_of^op some tuber^c
has sub-classes: aerial tuber storage parenchyma^c, subterranean tuber storage parenchyma^c

tubercle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025352

Found in cacti and other succulents. The upper part of a leaf from which a tubercle develops is usually shed early in development. Tubercles are often conical, but they may merge with those directly above and below to form ribs, as in saguaro (Carnegiea), or they may elongate, as in species of pincushion cacti (Mammillaria). In species with tubercles, the areole bud (PO:0025353) is often found at the distal end of the tubercle. The areole bud originates in the leaf axil (PO:0009023) of the leaf that becomes the tubercle, but is displaced to the tip through elongation of the tubercle.

has super-classes: leaf base^c; part_of^op some vascular leaf^c

tuberous root^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025523

has super-classes: root^c

tuberous root tuber^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025476

Functions in storage. This term should be used for tubers derived from roots (PO:0009005), as found in Cassava or sweet potato (Ipomoea batatas), not for tubers derived from branches (PO:0025073), as found in potatoes and yams. Use the term shoot axis tuber (PO:0004543), aerial tuber (PO:0004548), or subterranean tuber (PO:0004547) for tubers derived from branches. A tuberous root tuber may be distinguished from a tuber that is derived from a branch by the presence of a root cap (PO:0020123) early in development, or the presence of lateral roots (PO:0020121) or their remnants. Sometimes tuber roots bear vegetative buds (PO:0000058) like a tuber derived from a branch. A tuberous root tuber usually develops from a shoot-borne root (PO:0000042) or a lateral root (PO:0020121).

has super-classes: root^c; tuber^c; develops_from^op some tuberous root^c

tunica^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006302

The term has been made obsolete because this concept is used in a very loose sense.

umbel inflorescence^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030129

The flowers (PO:0009046) of an umbel inflorescence appear as clusters originating from a single point, due to compression of the inflorescence axis internodes (PO:0006326) of the first order inflorescence axis (PO:0025104). Umbel inflorescences are characteristic of the the Ivy family (Apiaceae or Umbelliferae), including english ivy (Hedera helix), ginseng (Panax ginseng), and the onion family (Alliaceae).

has super-classes: inflorescence^c

unicellular plant gametangium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025521

Occurs in some green alga, such as Ulva. Participates in the gametophyte development stage (PO:0028003).

has super-classes: b f o 0000002; native plant cell^c; participates_in^op some gametophyte development stage^c

unicellular trichome^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025537

This should not be confused with a trichome cell (PO:0008030), which is a plant cell (PO:0009002) that is part of a multicellular trichome (PO:0000282). For parts of the unicellular trichome (such as branch, tip, apex), please see the GO cellular component terms; unicellular trichome apex (GO:0090552), unicellular trichome tip (GO:0090553), and unicellular trichome branch (GO:0090405).

has super-classes: trichome^c; native plant cell^c; develops_from^op some epidermal cell^c

unifacial vascular leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025328

A unifacial leaf may be round in cross-section (terete) or it may be laminar (ensiform), in which case lamina development is in a median plane (perpendicular to the axis), rather than a transverse plane (tangent to the axis). Unifacial leaves may be bifacial at the leaf base. Many unifacial leaves develop by reduced (or absent) activity of the marginal meristems and increased activity of the adaxial meristem early in development, leading to mature leaves with only an adaxial surface (e.g., Acacia phyllodes). However, some develop by increased activity of the abaxial meristem early in development, leading to mature leaves with only an abaxial surface. Note that unifacial leaves may have two sides, as in ensiform leaves, but both sides arise from the same surface of the leaf meristem (abaxial or adaxial).

has super-classes: vascular leaf^c
has sub-classes: ensiform vascular leaf^c, terete vascular leaf^c

upper floret of pedicellate spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006350

The upper floret on the ear usually develops into a functional one.

has super-classes: ear floret^c; part_of^op some ear pedicellate spikelet^c

upper floret of pedicellate spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006314

has super-classes: tassel floret^c; part_of^op some tassel pedicellate spikelet^c

upper floret of sessile spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006352

This floret usually develops into a functional one.

has super-classes: ear floret^c; part_of^op some ear sessile spikelet^c

upper floret of sessile spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006316

has super-classes: tassel floret^c; part_of^op some tassel sessile spikelet^c

upper glume^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006004

has super-classes: glume^c
has sub-classes: upper glume of ear spikelet^c, upper glume of tassel spikelet^c

upper glume of ear spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006371

has super-classes: upper glume^c; glume of ear spikelet^c
has sub-classes: upper glume of pedicellate spikelet of ear^c, upper glume of sessile spikelet of ear^c

upper glume of pedicellate spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006439

has super-classes: upper glume of ear spikelet^c; part_of^op some ear pedicellate spikelet^c

upper glume of pedicellate spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006388

has super-classes: upper glume of tassel spikelet^c; part_of^op some tassel pedicellate spikelet^c

upper glume of sessile spikelet of ear^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006440

has super-classes: upper glume of ear spikelet^c; part_of^op some ear sessile spikelet^c

upper glume of sessile spikelet of tassel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006387

has super-classes: upper glume of tassel spikelet^c; part_of^op some tassel sessile spikelet^c

upper glume of tassel spikelet^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006370

has super-classes: upper glume^c; glume of tassel spikelet^c
has sub-classes: upper glume of pedicellate spikelet of tassel^c, upper glume of sessile spikelet of tassel^c

upright ray secondary xylem parenchyma cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004528

has super-classes: ray secondary xylem parenchyma cell^c
has sub-classes: sheath cell^c, tile cell^c

utricle capsule fruit^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030097

Example: common amaranth (Amaranthus retroflexus).

has super-classes: circumscissile capsule fruit^c

valve^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025228

has super-classes: cardinal organ part^c
has sub-classes: fruit valve^c, spore capsule valve^c

vascular bundle^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005020

May also contain portions of ground tissue (PO:0025059). The bundle sheath (PO:0006023) can also be part of a vascular bundle, if it is present.

has super-classes: portion of vascular tissue^c
has sub-classes: pericarp vascular bundle^c, petiole vascular bundle^c, phyllome lamina vein^c

vascular cambium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005598

A vascular cambium produces cells in both directions, centrifugally and centrifically, leading to an increase in the cross-sectional area of a plant axis (PO:0025004).

has super-classes: cambium^c
has sub-classes: fascicular cambium^c, included vascular cambium^c, interfascicular cambium^c, outer vascular cambium^c, root vascular cambium^c, shoot axis vascular cambium^c

vascular leaf^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0009025

Has vascular tissue. From APweb Glossary: In angiosperms, commonly thought of as one of the three basic parts of the seed plant body, a structure usually of determinate growth, without secondary thickening, and of superficial origin, often flattened and photosynthetic in part, and in the axil of which is found a bud. Occurs in the sporophytic phase of a plant life cycle.

has super-classes: leaf^c; develops_from^op some vascular leaf primordium^c; participates_in^op some sporophyte development stage^c
has sub-classes: adult vascular leaf^c, cauline leaf^c, cigar leaf^c, compound leaf^c, cotyledon^c, embryo leaf^c, juvenile vascular leaf^c, leaf tendril^c, rosette leaf^c, simple leaf^c, spine leaf^c, transition vascular leaf^c, unifacial vascular leaf^c

vascular leaf abaxial meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025403

Contributes to the thickness of a vascular leaf (PO:0009025). There are two types of abaxial meristems. In leaves with a petiole (PO:0020038) and lamina (PO:0025060), such as Arabidopsis thaliana, an abaxial rounding meristem occurs later in development, is separated from the apical meristem (PO:0020144), and contributes to the thickness of the petiole and midrib. In unifacial leaves, the abaxial unifacial meristem occurs earlier in development, is close to but separate from the apical meristem, and contributes to the thickness and cross-sectional shape of the entire leaf.

has super-classes: phyllome abaxial meristem^c; part_of^op some vascular leaf^c

vascular leaf adaxial meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025401

Contributes to the thickness of a vascular leaf (PO:0009025). There are two types of adaxial meristems. In leaves with a petiole (PO:0020038) and lamina (PO:0025060), such as Arabidopsis thaliana, an adaxial rounding meristem occurs later in development, is separated from the apical meristem (PO:0020144), and contributes to the thickness of the petiole and midrib. In unifacial leaves, the an adaxial unifacial meristem occurs earlier in development, is close to but separate from the apical meristem, and contributes to the thickness and cross-sectional shape of the entire leaf.

has super-classes: phyllome adaxial meristem^c; part_of^op some vascular leaf^c

vascular leaf anlagen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025431

This is the region where you have the maximum concentration of auxin in the SAM (at least in a few species that have been studied).

has super-classes: phyllome anlagen^c; part_of^op some vegetative shoot apical meristem^c

vascular leaf anlagen formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001003

The initial stage of leaf development when cells in the shoot apical meristem (PO:0020148) are already determined to form a vascular leaf primordium (PO:0000017), but the primordium is not yet morphologically distinguishable.

has super-classes: vascular leaf initiation stage^c

vascular leaf development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025570

In some plants, the leaf developmental stages may occur in the same leaf simultaneously. For example, leaves maize (or other grasses) have various zones where stages are occurring along the length of the lamina.

has super-classes: leaf development stage^c
has sub-classes: vascular leaf differentiation stage^c, vascular leaf expansion stage^c, vascular leaf initiation stage^c, vascular leaf post-expansion stage^c, vascular leaf senescent stage^c

vascular leaf differentiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025574

has super-classes: b f o 0000003; vascular leaf development stage^c; preceded_by^op some vascular leaf initiation stage^c

vascular leaf expansion stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001052

During this stage leaf shaping (GO:0010358) occurs which is defined as the developmental process that pertains to the organization of a leaf in three-dimensional space once the structure has initially formed.

has super-classes: b f o 0000003; vascular leaf development stage^c; preceded_by^op some vascular leaf differentiation stage^c
has sub-classes: formation of ligule primordium stage^c, formation of vascular leaflet primordia stage^c, hood-shaped primordium stage^c, rapid elongation of leaf sheath stage^c, rapid elongation of vascular leaf lamina stage^c

vascular leaf founder cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025592

As a group, the vascular leaf founder cells encompass several layers of the shoot apical meristem (PO:0020148) and form a vascular leaf anlagen (PO:0025431). Founder cells do not function as stem cells but rather have a determinate fate and can be defined by histological, clonal and molecular criteria. The analagen may consist of one or more founder cells.

has super-classes: phyllome founder cell^c; part_of^op some vascular leaf anlagen^c

vascular leaf initiation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001051

Localized cell divisions in the peripheral zone (PO:0000225) transition from anticlinal to periclinal divisions.

has super-classes: vascular leaf development stage^c
has sub-classes: vascular leaf anlagen formation stage^c, vascular leaf primordium formation stage^c, vascular leaf primordium polarity determination stage^c

vascular leaf meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030012

Occurs in vascular leaves of some ferns in their sporophytic phase.

has super-classes: leaf meristematic apical cell^c; part_of^op some vascular leaf^c

vascular leaf post-expansion stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001053

has super-classes: b f o 0000003; vascular leaf development stage^c; preceded_by^op some vascular leaf expansion stage^c

vascular leaf primordium^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000017

has super-classes: phyllome primordium^c; part_of^op some vegetative shoot apex^c; develops_from^op some vascular leaf anlagen^c

vascular leaf primordium abaxial side^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004725

While the abaxial side of the leaf is usually the lower surface, the vascular leaves (PO:0009025) of some plants may not have an obvious adaxial or abaxial side such as the leaves of many xerophytic (arid-adapted) species. The adaxial and abaxial side may appear considerably more rounded and this could be due to early activity of the vascular leaf adaxial meristem (PO:0025401) and/or leaf abaxial meristem (PO:0025401). In other cases, such as Alstromeria, the leaves may be twisted or resupinate.

has super-classes: phyllome primordium^c; part_of^op some vascular leaf primordium^c

vascular leaf primordium adaxial side^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0004726

While the adaxial side of the leaf is usually the upper surface, the vascular leaves (PO:0009025) of some plants may not have an obvious adaxial or abaxial side such as the leaves of many xerophytic (arid-adapted) species. The adaxial and abaxial side may appear considerably more rounded and this could be due to early activity of the vascular leaf adaxial meristem (PO:0025401) and/or leaf abaxial meristem (PO:0025401). In other cases, such as Alstromeria, the leaves may be twisted or resupinate.

has super-classes: phyllome primordium^c; part_of^op some vascular leaf primordium^c

vascular leaf primordium formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001019

The vascular leaf primordium (PO:0000017) develops from the vascular leaf anlagen (PO:0025431).

has super-classes: b f o 0000003; vascular leaf initiation stage^c; preceded_by^op some vascular leaf anlagen formation stage^c

vascular leaf primordium polarity determination stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025572

The vascular leaf primordium adaxial side (PO:0004726) is the side proximal to the axis of the vegetative shoot apical meristem (PO:0020148), while abaxial side (PO:0004725) is the distal side.

has super-classes: b f o 0000003; vascular leaf initiation stage^c; preceded_by^op some vascular leaf primordium formation stage^c

vascular leaf senescent stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0001054

has super-classes: b f o 0000003; vascular leaf development stage^c; preceded_by^op some vascular leaf post-expansion stage^c

vascular shoot axis meristematic apical cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030024

Occurs in some ferns in their sporophytic phase.

has super-classes: shoot axis meristematic apical cell^c; sporophyte meristematic apical cell^c

vascular system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000034

A vascular system consist of the totality of the portions of vascular tissue in their specific arrangement in a plant structure. May include other portions of plant tissue or plant cells (PO:0009002) of other types, such as parenchyma (PO:0005421) or fiber cells (PO:0025407).

has super-classes: b f o 0000002; portion of vascular tissue^c; part_of^op some whole plant^c; participates_in^op some sporophyte development stage^c
has sub-classes: cotyledon vascular system^c, filament vascular system^c, fruit vascular system^c, hypocotyl vascular system^c, leaf lamina vascular system^c, petiole vascular system^c, phyllome vascular system^c, plant embryo vascular system^c, root vascular system^c, scutellum vascular system^c, shoot axis vascular system^c, shoot system vascular system^c, stigma vascular system^c
is disjoint with: plant cell^c, plant organ^c, cardinal organ part^c, collective plant organ structure^c, collective organ part structure^c

vascular tissue development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025424

has super-classes: plant tissue development stage^c; has_participant^op some portion of vascular tissue^c
has sub-classes: phloem development stage^c, xylem development stage^c

vegetative bud^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000058

has super-classes: bud^c
has sub-classes: axillary vegetative bud^c, gametophore bud^c, terminal vegetative bud^c

vegetative shoot apex^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025223

has super-classes: shoot axis apex^c; has_part^op some vegetative shoot apical meristem^c

vegetative shoot apical meristem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0008016

has super-classes: shoot apical meristem^c
has sub-classes: embryo shoot apical meristem^c

vegetative shoot system^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025607

has super-classes: b f o 0000004; shoot system^c; develops_from^op some vegetative bud^c; has_part^op some vegetative shoot apex^c

velamen^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0006042

has super-classes: root epidermis^c

venter^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0030038

After fertilization, the venter develops into the spore capsule calyptra (PO:0030037), which protects the sporangium (syn: spore capsule; PO:0025094) containing the developing sporophyte.

has super-classes: cardinal organ part^c; part_of^op some archegonium^c

ventral canal cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025524

The ventral canal cell is smaller than the archegonium egg cell (PO:0025122), which also develops from the asymmetric division of the archegonium central cell (PO:0025509). It lack a plant-type cell wall (GO:0009505) (ref? ). When the archegonium (PO:0025126) is mature, the ventral canal cell (along with the archegonium neck canal cells; PO:0030065), contributes to the formation of the archegonium neck canal (PO:0030066) by distintegrating and becoming mucilaginous. The canal cells and may produce chemicals to attract the male gamete, the antheridium sperm cells (PO:0025120).

has super-classes: b f o 0000004; native plant cell^c; part_of^op some venter^c; develops_from^op some archegonium central cell^c

whole plant^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000003

Examples include plant embryo (PO:0009009), megagametophyte (PO:0025279) and microgametophyte (PO:0025280).

has super-classes: plant structure^c
has sub-classes: megagametophyte^c, microgametophyte^c, plant embryo^c, plant spore^c, thallus^c

whole plant development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007033

has super-classes: b f o 0000003; plant structure development stage^c; has_participant^op some whole plant^c
has sub-classes: gametophyte development stage^c, life of whole plant stage^c, sporophyte development stage^c

whole plant flowering stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007016

This term is to be used for a stage of development of a whole plant. For the stages of development of an individual flower, see flower development stage (PO:0007615).

has super-classes: sporophyte reproductive stage^c
has sub-classes: FL.00 first flower(s) open stage^c, FL.01 1/4 of flowers open stage^c, FL.02 1/2 of flowers open stage^c, FL.03 3/4 of flowers open stage^c, FL.04 end of flowering stage^c

whole plant fruit development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025500

A whole plant fruit development stage begins with the beginning of whole plant fruit formation stage (PO:0007042) and ends with the end of a whole plant fruit ripening stage (PO:0007010). A whole plant fruit development stage can be thought of as a fruiting cycle for a whole plant that begins when the plant starts to produce fruit and ends when all of the fruit on the plant are ripe, unless the plant enters a sporophyte senescent stage or sporophyte dormant stage before all the fruit is ripe. An iteroparous plant will have a single whole plant fruit development stage during its life of whole plant (PO:0025337), while a semelparous plant may have multiple whole plant fruit development stages during its life, each of which will be part of the same instance of a sporophyte reproductive stage. Some plants retain their fruit after ripening and through dormancy, and thus may begin a new whole fruit development stage while fruits from the previous whole plant fruit development stage are still present.

has super-classes: sporophyte reproductive stage^c
has sub-classes: whole plant fruit formation stage^c, whole plant fruit ripening stage^c

whole plant fruit formation stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007042

This term is to be used for a stage of development of a whole plant (PO:0000003). For the stages of development of an individual fruit, see fruit development stage (PO:0001002). An iteroparous plant will only have one fruit formation stage in its life, while a semelparous plant may have multiple whole plant fruit formation stages during its life. In plants with continuous (i.e., indeterminate) fruit development (GO:0010154), new fruits may continue to develop after the first fruit has begun to ripen and the fruit ripening stage of whole plant (PO:0007042) has begun. Although the use of synonyms like "07-milk stage in rice" properly refer to the development of an individual fruits, they are used as here to extrapolate to a whole plant.

has super-classes: whole plant fruit development stage^c
has sub-classes: whole plant fruit formation stage 10 to 30%^c, whole plant fruit formation stage 30 to 50%^c, whole plant fruit formation stage 50 to 70%^c, whole plant fruit formation stage 70% to final size^c, whole plant fruit formation stage up to 10%^c

whole plant fruit formation stage 10 to 30%^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007009

This terms is best used for plant with more or less synchronous fruit development and can only be used of the final size of the fruit is known. This stage is to be used for the development stage of a whole plant (PO:0000003). For an individual fruit, use fruit size 10 to 30% stage (PO:0025505).

has super-classes: whole plant fruit formation stage^c

whole plant fruit formation stage 30 to 50%^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007029

has super-classes: whole plant fruit formation stage^c

whole plant fruit formation stage 50 to 70%^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007007

has super-classes: whole plant fruit formation stage^c

whole plant fruit formation stage 70% to final size^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007027

Succeeded by a whole plant fruit ripening stage (PO:0007010). This terms is best used for plant with more or less synchronous fruit development and can only be used of the final size of the fruit is known. This stage is to be used for the development stage of a whole plant (PO:0000003). For an individual fruit, use fruit size 70% to final size stage (PO:0025508).

has super-classes: whole plant fruit formation stage^c

whole plant fruit formation stage up to 10%^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007032

has super-classes: whole plant fruit formation stage^c

whole plant fruit ripening complete stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007038

has super-classes: whole plant fruit ripening stage^c

whole plant fruit ripening stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007010

Succeeds a whole plant fruit formation stage (PO:0007042). This term is to be used for a stage of development of a whole plant. For the stages of development of an individual fruit, see fruit ripening stage (PO:0025502). Although individual fruits are undergoing fruit ripening (GO:0009835), which is a type of senescence, during this stage, the whole plant is not yet undergoing multicelluar organism senescence (GO:0010259). An iteroparous species generally will have only one fruit ripening stage in its life, while a semelparous species may have multiple fruit ripening stage in its life. A whole plant fruit ripening stage may be followed by a sporophyte senescent stage, as in case (1) or by a sporophyte dormant stage (PO:0007132), as in case (2). In evergreen species and species that fruit multiple times during a growing season, a plant may have multiple fruit development stages without entering dormancy or senescence, as in case (3). In plants with continuous (i.e., indeterminate) fruit development (GO:0010154), new fruits may continue to develop after the first fruit has begun to ripen and the whole plant fruit formation stage (PO:0007042) has ended. In some plants, fruit may continue to ripen after the whole plant has entered a sporophyte dormant stage or sporophyte senescent stage and left the whole plant fruit ripening stage. Some plants may never enter a whole plant fruit ripening stage, because fruits only begin to ripen after the plant has entered a sporophyte dormant stage or sporophyte senescent stage. Although the use of synonyms like "10-dough stage in sorghum" properly refer to the development of an individual fruit, they are used as here to extrapolate to a whole plant.

has super-classes: whole plant fruit development stage^c
has sub-classes: beginning of whole plant fruit ripening stage^c, early whole plant fruit ripening stage^c, late whole plant fruit ripening stage^c, mid whole plant fruit ripening stage^c, whole plant fruit ripening complete stage^c

whole plant inflorescence detectable stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0007047

This includes the stage when an inflorescence starts to develop (and is detectable only by assay or with a microscope), to the stage where it is visible to the naked eye. This includes the booting stage in the grasses (Poaceae). There is no one-to-one correspondence between some of the phases of inflorescence formation in members of Poaceae (e.g., booting) with that of other families.

has super-classes: sporophyte reproductive stage^c
has sub-classes: IL.00 inflorescence just visible stage^c, IL.01 1/4 inflorescence length reached stage^c, IL.02 1/2 inflorescence length reached stage^c, IL.03 full inflorescence length reached stage^c, inflorescence emergence stage^c

wing petal^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025325

The wing petals are usually much smaller than the banner petal and the corolla keel. Found in the flowers of some Fabaceae.

has super-classes: petal^c

xylem^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0005352

Functions in the translocation of water and solutes from roots (PO:0009005) to the shoot system (PO:0009006) and in support. Tracheary elements have lignified cell walls with secondary thickening and are dead at maturity.

has super-classes: portion of vascular tissue^c
has sub-classes: primary xylem^c, secondary xylem^c, tracheid bar^c, xylem vessel^c
is disjoint with: hydrome^c

xylem development stage^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025425

has super-classes: vascular tissue development stage^c; has_participant^op some xylem^c
has sub-classes: secondary xylem development stage^c

xylem element^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000273

This term was made obsolete because it was not appropriate. Replaced by tracheary element (PO:0000290) and xylem fiber cell (PO:0000274).

xylem fiber cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000274

It may be difficult to distinguish xylem fiber cells, especially fiber tracheids (PO:0000355), from tracheary elements (PO:0000290). Fiber tracheids have bordered pits with smaller pit cavities than the vessel members (PO:0002003) or tracheids (PO:0000301) of the same wood and a distinct pit cavity leading to the cell lumen through the cell wall.

is equivalent to: plant fiber cell^c and (part_of^op some xylem^c)
has super-classes: plant fiber cell^c; part_of^op some xylem^c
has sub-classes: fiber tracheid^c, gelatinous fiber cell^c, libriform fiber cell^c

xylem pole pericycle cell^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0000064

Xylem pole pericycle cells are cells in the pericycle that are adjacent to the protoxylem pole of a vascular bundle. Pericycle cells that are adjacent to other xylem cells in the vascular bundle are not considered xylem pole pericycle cells. Xylem pole pericycle cells may retain some meristematic activity and are the site of lateral root initiation.

has super-classes: pericycle cell^c

xylem sap^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025539

has super-classes: plant sap^c
has sub-classes: root system xylem sap^c, shoot system xylem sap^c

xylem vessel^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025417

has super-classes: xylem^c
has sub-classes: primary xylem vessel^c, secondary xylem vessel^c

xylem vessel member^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0002003

Commonly thick walled, with pointed ends and bordered pits that have lenticular to slit-like apertures. If both libriform fibers (PO:0004520) and fiber tracheids are present, the libriform fibers usually have thicker walls. Fiber tracheids have bordered pits with smaller pit cavities than the vessel members (PO:0002003) or tracheids (PO:0000301) of the same wood and a distinct pit cavity leading from the pit cavity to the cell lumen through the thick cell wall.

has super-classes: tracheary element^c; part_of^op some xylem vessel^c
has sub-classes: primary xylem vessel member^c, secondary xylem vessel member^c

zygotic plant embryo^c back to ToC or Class ToC

IRI: http://purl.obolibrary.org/obo/PO_0025303

has super-classes: plant embryo^c
has sub-classes: cultured zygote-derived plant embryo^c

This HTML document was obtained by processing the OWL ontology source code through LODE, Live OWL Documentation Environment, developed by Silvio Peroni.

Table of Content

Classes

1 main shoot growth stagec back to ToC or Class ToC

1 pattern formation stagec back to ToC or Class ToC

1 root primordium formation stagec back to ToC or Class ToC

2 endoreduplication stagec back to ToC or Class ToC

2 formation of axillary shoot stagec back to ToC or Class ToC

2 root meristem formation stagec back to ToC or Class ToC

2.00 main shoot onlyc back to ToC or Class ToC

2.01 main shoot and axillary shoots visible at one node stagec back to ToC or Class ToC

2.02 main shoot and axillary shoots visible at two nodes stagec back to ToC or Class ToC

2.03 main shoot and axillary shoots visible at three nodes stagec back to ToC or Class ToC

2.04 main shoot and axillary shoots visible at four nodes stagec back to ToC or Class ToC

2.05 main shoot and axillary shoots visible at five nodes stagec back to ToC or Class ToC

2.06 main shoot and axillary shoots visible at six nodes stagec back to ToC or Class ToC

2.07 main shoot and axillary shoots visible at seven nodes stagec back to ToC or Class ToC

2.08 main shoot and axillary shoots visible at eight nodes stagec back to ToC or Class ToC

2.09 main shoot and axillary shoots visible at nine or more nodes stagec back to ToC or Class ToC

3 branch formation stagec back to ToC or Class ToC

3 establishment of tissue systems stagec back to ToC or Class ToC

3 rapid growth stagec back to ToC or Class ToC

4 growth directionality stagec back to ToC or Class ToC

4 root elongation stagec back to ToC or Class ToC

5 root hair formation stagec back to ToC or Class ToC

5.02 20% of inflorescence emerged.c back to ToC or Class ToC

5.04 40% of inflorescence emergedc back to ToC or Class ToC

5.06 60% of inflorescence emergedc back to ToC or Class ToC

5.08 80% of inflorescence emergedc back to ToC or Class ToC

6.01 10% of flowers openc back to ToC or Class ToC

6.03 30% of flowers openc back to ToC or Class ToC

6.04 40% of flowers openc back to ToC or Class ToC

7-8 fruit formation and maturationc back to ToC or Class ToC

7.02 fruit size 20%c back to ToC or Class ToC

7.04 fruit size 40%c back to ToC or Class ToC

7.06 fruit size 60%c back to ToC or Class ToC

7.08 fruit size 80%c back to ToC or Class ToC

A archesporial cells visible stagec back to ToC or Class ToC

A megaspore mother cell enlarges stagec back to ToC or Class ToC

A microsporogenous mass stagec back to ToC or Class ToC

A1 root initials formation stagec back to ToC or Class ToC

A2 root initials differentiation stagec back to ToC or Class ToC

A2.1 root intials differntiation of primary rootsc back to ToC or Class ToC

A2.2 root initials differentiation of lateral rootsc back to ToC or Class ToC

A2.3 founder cell derivatives of lateral rootc back to ToC or Class ToC

A2.4 root initials differentiation of crown rootsc back to ToC or Class ToC

abaxial nucellar projectionc back to ToC or Class ToC

abaxial petiole canalc back to ToC or Class ToC

abaxial protodermc back to ToC or Class ToC

abscission zonec back to ToC or Class ToC

accessory paracladec back to ToC or Class ToC

accessory transfusion tissuec back to ToC or Class ToC

achene fruitc back to ToC or Class ToC

adaxial nucellar projectionc back to ToC or Class ToC

adaxial petiole canalc back to ToC or Class ToC

adaxial protodermc back to ToC or Class ToC

adult vascular leafc back to ToC or Class ToC

adventitious root nodulec back to ToC or Class ToC

adventitious root primordiumc back to ToC or Class ToC

adventitious shoot axisc back to ToC or Class ToC

aerenchymac back to ToC or Class ToC

aerial tuberc back to ToC or Class ToC

aerial tuber axillary bud meristemc back to ToC or Class ToC

aerial tuber axillary shootc back to ToC or Class ToC

aerial tuber axillary vegetative budc back to ToC or Class ToC

aerial tuber cortexc back to ToC or Class ToC

aerial tuber epidermisc back to ToC or Class ToC

aerial tuber interfascicular regionc back to ToC or Class ToC

aerial tuber peridermc back to ToC or Class ToC

aerial tuber perimedullary zonec back to ToC or Class ToC

aerial tuber pithc back to ToC or Class ToC

aerial tuber storage parenchymac back to ToC or Class ToC

alar cellc back to ToC or Class ToC

albuminous cellc back to ToC or Class ToC

aleurone layerc back to ToC or Class ToC

amphitheciumc back to ToC or Class ToC

androeciumc back to ToC or Class ToC

androecium development stagec back to ToC or Class ToC

androecium primordiumc back to ToC or Class ToC

angular collenchymac back to ToC or Class ToC

anthela inflorescencec back to ToC or Class ToC

1 main shoot growth stage^c back to ToC or Class ToC

1 pattern formation stage^c back to ToC or Class ToC

1 root primordium formation stage^c back to ToC or Class ToC

2 endoreduplication stage^c back to ToC or Class ToC

2 formation of axillary shoot stage^c back to ToC or Class ToC

2 root meristem formation stage^c back to ToC or Class ToC

2.00 main shoot only^c back to ToC or Class ToC

2.01 main shoot and axillary shoots visible at one node stage^c back to ToC or Class ToC

2.02 main shoot and axillary shoots visible at two nodes stage^c back to ToC or Class ToC

2.03 main shoot and axillary shoots visible at three nodes stage^c back to ToC or Class ToC

2.04 main shoot and axillary shoots visible at four nodes stage^c back to ToC or Class ToC

2.05 main shoot and axillary shoots visible at five nodes stage^c back to ToC or Class ToC

2.06 main shoot and axillary shoots visible at six nodes stage^c back to ToC or Class ToC

2.07 main shoot and axillary shoots visible at seven nodes stage^c back to ToC or Class ToC

2.08 main shoot and axillary shoots visible at eight nodes stage^c back to ToC or Class ToC

2.09 main shoot and axillary shoots visible at nine or more nodes stage^c back to ToC or Class ToC

3 branch formation stage^c back to ToC or Class ToC

3 establishment of tissue systems stage^c back to ToC or Class ToC

3 rapid growth stage^c back to ToC or Class ToC

4 growth directionality stage^c back to ToC or Class ToC

4 root elongation stage^c back to ToC or Class ToC

5 root hair formation stage^c back to ToC or Class ToC

5.02 20% of inflorescence emerged.^c back to ToC or Class ToC

5.04 40% of inflorescence emerged^c back to ToC or Class ToC

5.06 60% of inflorescence emerged^c back to ToC or Class ToC

5.08 80% of inflorescence emerged^c back to ToC or Class ToC

6.01 10% of flowers open^c back to ToC or Class ToC

6.03 30% of flowers open^c back to ToC or Class ToC

6.04 40% of flowers open^c back to ToC or Class ToC

7-8 fruit formation and maturation^c back to ToC or Class ToC

7.02 fruit size 20%^c back to ToC or Class ToC

7.04 fruit size 40%^c back to ToC or Class ToC

7.06 fruit size 60%^c back to ToC or Class ToC

7.08 fruit size 80%^c back to ToC or Class ToC

A archesporial cells visible stage^c back to ToC or Class ToC

A megaspore mother cell enlarges stage^c back to ToC or Class ToC

A microsporogenous mass stage^c back to ToC or Class ToC

A1 root initials formation stage^c back to ToC or Class ToC

A2 root initials differentiation stage^c back to ToC or Class ToC

A2.1 root intials differntiation of primary roots^c back to ToC or Class ToC

A2.2 root initials differentiation of lateral roots^c back to ToC or Class ToC

A2.3 founder cell derivatives of lateral root^c back to ToC or Class ToC

A2.4 root initials differentiation of crown roots^c back to ToC or Class ToC

abaxial nucellar projection^c back to ToC or Class ToC

abaxial petiole canal^c back to ToC or Class ToC

abaxial protoderm^c back to ToC or Class ToC

abscission zone^c back to ToC or Class ToC

accessory paraclade^c back to ToC or Class ToC

accessory transfusion tissue^c back to ToC or Class ToC

achene fruit^c back to ToC or Class ToC

adaxial nucellar projection^c back to ToC or Class ToC

adaxial petiole canal^c back to ToC or Class ToC

adaxial protoderm^c back to ToC or Class ToC

adult vascular leaf^c back to ToC or Class ToC

adventitious root nodule^c back to ToC or Class ToC

adventitious root primordium^c back to ToC or Class ToC

adventitious shoot axis^c back to ToC or Class ToC

aerenchyma^c back to ToC or Class ToC

aerial tuber^c back to ToC or Class ToC

aerial tuber axillary bud meristem^c back to ToC or Class ToC

aerial tuber axillary shoot^c back to ToC or Class ToC

aerial tuber axillary vegetative bud^c back to ToC or Class ToC

aerial tuber cortex^c back to ToC or Class ToC

aerial tuber epidermis^c back to ToC or Class ToC

aerial tuber interfascicular region^c back to ToC or Class ToC

aerial tuber periderm^c back to ToC or Class ToC

aerial tuber perimedullary zone^c back to ToC or Class ToC

aerial tuber pith^c back to ToC or Class ToC

aerial tuber storage parenchyma^c back to ToC or Class ToC

alar cell^c back to ToC or Class ToC

albuminous cell^c back to ToC or Class ToC

aleurone layer^c back to ToC or Class ToC

amphithecium^c back to ToC or Class ToC

androecium^c back to ToC or Class ToC

androecium development stage^c back to ToC or Class ToC

androecium primordium^c back to ToC or Class ToC

angular collenchyma^c back to ToC or Class ToC

anthela inflorescence^c back to ToC or Class ToC

anther^c back to ToC or Class ToC

anther dehiscence zone^c back to ToC or Class ToC