valve [
PO:0025228; plant anatomy term ]
A cardinal organ part that is a part of a plant structure that splits apart when the structure dehisces.
More Synonyms: valva (Spanish), 弁 (Japanese)
Comments:
vascular bundle [
PO:0005020; plant anatomy term ]
A portion of vascular tissue (PO:0009015) that is a unit strand of the vascular system (PO:0000034) and has as part xylem (PO:0005352) or phloem (PO:0005417).
More Synonyms: 維管束 (Japanese), haz vascular (Spanish), vein
Comments: 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.
vascular cambium [
PO:0005598; plant anatomy term ]
A cambium (PO:0005597) that is located between and gives rise to secondary xylem (PO:0005848) and secondary phloem (PO:0005043).
More Synonyms: cambium vascular (Spanish), 維管束形成層 (Japanese)
Comments: 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).
vascular leaf [
PO:0009025; plant anatomy term ]
A leaf (PO:0025034) in a vascular plant.
More Synonyms: ascidia, ascidium, crozier, 維管束のある葉, または維管束植物の葉 (Japanese), fiddlehead, foliage leaf, frond, hoja vascular (Spanish), leaf, vascular, macrophyll, megaphyll, needle-like leaf, pitcher, pitcher blade, pitcher-blade, scale-like leaf, sterile frond, trophophyll, vascular leaves
Comments: 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.
vascular leaf abaxial meristem [
PO:0025403; plant anatomy term ]
A portion of phyllome abaxial meristem (PO:0025402) tissue that is found on the abaxial side of a developing vascular leaf (PO:0009025).
More Synonyms: 葉背軸側分裂組織 (Japanese), leaf abaxial rounding meristem, leaf abaxial unifacial meristem
Comments: 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.
vascular leaf adaxial meristem [
PO:0025401; plant anatomy term ]
A portion of phyllome adaxial meristem (PO:0025400) tissue that is found on the adaxial side of a developing vascular leaf (PO:0009025).
More Synonyms: 葉向軸側分裂組織 (Japanese), leaf adaxial rounding meristem, leaf adaxial unifacial meristem, leaf ventral meristem
Comments: 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.
vascular leaf anlagen [
PO:0025431; plant anatomy term ]
A phyllome anlagen (PO:0025430) that will give rise to a vascular leaf primordium (PO:0000017) and is part of a peripheral zone (PO:0000225) of a shoot apical meristem (PO:0020148).
More Synonyms: 維管束系葉原基 (Japanese), leaf meristem
Comments: 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).
vascular leaf founder cell [
PO:0025592; plant anatomy term ]
A phyllome founder cell (PO:0025586) that is part of a vascular leaf anlagen (PO:0025431).
More Synonyms:
Comments: 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.
vascular leaf meristematic apical cell [
PO:0030012; plant anatomy term ]
A leaf meristematic apical cell that is part of the leaf apex of a vascular leaf.
More Synonyms: célula apical de la hoja vascular (Spanish), 維管束を持つ葉の分裂組織の頂端細胞 (Japanese), vascular leaf apical cell, vascular leaf apical initial
Comments: Occurs in vascular leaves of some ferns in their sporophytic phase.
vascular leaf primordium [
PO:0000017; plant anatomy term ]
A phyllome primordium (PO:0025128) that develops from a vascular leaf anlagen (PO:0025431) and is part of a vegetative shoot apex (PO:0025223) and is committed to the development of a vascular leaf (PO:0009025).
More Synonyms: 葉原基 (Japanese), leaf primordium, portion of vascular leaf primordium tissue, primordio de hoja (Spanish), vascular leaf primordia
Comments:
vascular leaf primordium abaxial side [
PO:0004725; plant anatomy term ]
A portion of vascular leaf primordium (PO:0000017) that is distal to the axis of the shoot apical meristem (PO:0020148) and develops into the abaxial side of the leaf lamina (PO:0020039).
More Synonyms: 葉原基の裏側、背軸側 (Japanese), lado abaxial del primordio de hoja (Spanish)
Comments: 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.
vascular leaf primordium adaxial side [
PO:0004726; plant anatomy term ]
A portion of vascular leaf primordium (PO:0000017) that is proximal to the axis of the shoot apical meristem (PO:0020148) and develops into the adaxial side of the leaf lamina (PO:0020039).
More Synonyms: 葉原基(可視的)の表側、向軸側 (Japanese), lado adaxial del primordio de la hoja (Spanish)
Comments: 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.
vascular shoot axis meristematic apical cell [
PO:0030024; plant anatomy term ]
A shoot axis meristematic apical cell at the tip of a shoot apex in a shoot system that has as part vascular tissue.
More Synonyms: célula apical del eje del epiblasto vascualr (Spanish), 維管束を持つシュート軸分裂組織の頂端細胞 (Japanese), fern shoot axis apical cell, vascular shoot axis apical cell, vascular shoot axis apical initial
Comments: Occurs in some ferns in their sporophytic phase.
vascular system [
PO:0000034; plant anatomy term ]
A maximal portion of vascular tissue (PO:0009015) in a whole plant (PO:0000003), collective plant structure (PO:0025497), multi-tissue plant structure (PO:0025496), or cardinal part of multi-tissue plant structure (PO:0025498).
More Synonyms: 維管束系 (Japanese), sistema vascular (Spanish), vasculature
Comments: 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).
vegetative bud [
PO:0000058; plant anatomy term ]
A bud (PO:0000055) that develops into a vegetative shoot system (PO:0025607).
More Synonyms: yema vegetativa (Spanish), 枝芽 (Japanese)
Comments:
vegetative shoot apex [
PO:0025223; plant anatomy term ]
A shoot apex PO:0000037) that has as part a vegetative shoot apical meristem (PO:0008016).
More Synonyms: ápice vegetativo del epiblasto (epiblastema) (Spanish), 栄養シュート頂、栄養枝頂 (Japanese)
Comments:
vegetative shoot apical meristem [
PO:0008016; plant anatomy term ]
A shoot apical meristem (PO:0020148) that gives rise to the apical growth of vegetative tissues and organs.
More Synonyms: meristema vegetativo apical del epiblasto (epiblastema) (Spanish), vegetative meristem, 栄養シュート頂端分裂組織 (Japanese)
Comments:
vegetative shoot system [
PO:0025607; plant anatomy term ]
A shoot system (PO:0009006) that has as parts only vegetative tissues and organs.
More Synonyms:
Comments:
velamen [
PO:0006042; plant anatomy term ]
A multiseriate epidermis found in aerial roots of some monocots. Most of its cells are dead and store water like a sponge.
More Synonyms: velamen (Spanish), velamen radicum, velamina, 根被(套被) (Japanese)
Comments:
venter [
PO:0030038; plant anatomy term ]
A cardinal organ part (PO:0025001) that is the enlarged basal part of an archegonium (PO:0025126) and has an archegonium egg cell (PO:0025122) located in it.
More Synonyms: 造卵器腹部 (Japanese), vientre (Spanish)
Comments: 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.
ventral canal cell [
PO:0025524; plant anatomy term ]
A native plant cell (PO:0025606) that develops from the archegonium central cell (PO:0025509), and lies at the base of the archegonium neck (PO:0030039), above the archegonium egg cell (PO:0025122) in the venter (PO:0030038).
More Synonyms:
Comments: 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).