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Glossary of Plant Anatomy
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ear apical meristem [PO:0006375; plant anatomy term ]
An inflorescence apical meristem that gives rise to the maize ear.
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An inflorescence apical meristem that gives rise to the maize ear.
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ear floret [PO:0006354; plant anatomy term ]
A small, pistillate flower (PO:0025599) that is part of a ear spikelet (PO:0006320).
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A small, pistillate flower (PO:0025599) that is part of a ear spikelet (PO:0006320).
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ear inflorescence [PO:0020136; plant anatomy term ]
A pistillate inflorescence (PO:0025598) in Zea species that is highly compacted and bears the ear spikelets (PO:0006320) on a lateral inflorescence axis (PO:0020122).
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A pistillate inflorescence (PO:0025598) in Zea species that is highly compacted and bears the ear spikelets (PO:0006320) on a lateral inflorescence axis (PO:0020122).
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ear inflorescence branch meristem [PO:0009110; plant anatomy term ]
An inflorescence branch meristem (PO:0009105) that gives rise to a branch of an ear inflorescence (PO:0020136).
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An inflorescence branch meristem (PO:0009105) that gives rise to a branch of an ear inflorescence (PO:0020136).
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ear infructescence [PO:0025597; plant anatomy term ]
An infructescence (PO:0006342) in Zea species that bears kernels (i.e. fruit; PO:0009001) on a compact infructescence axis (PO:0025242) and develops from the ear inflorescence (PO:0020136).
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An infructescence (PO:0006342) in Zea species that bears kernels (i.e. fruit; PO:0009001) on a compact infructescence axis (PO:0025242) and develops from the ear inflorescence (PO:0020136).
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ear meristem [PO:0009109; plant anatomy term ]
The meristem which gives rise to the female inflorescence or ear in maize.
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The meristem which gives rise to the female inflorescence or ear in maize.
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ear pedicellate spikelet [PO:0006348; plant anatomy term ]
Ultimate pedicellate inflorescence branch of the maize ear that develops from the spikelet pair meristem.
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Ultimate pedicellate inflorescence branch of the maize ear that develops from the spikelet pair meristem.
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ear peduncle [PO:0006418; plant anatomy term ]
A peduncle of a maize ear, below the lowest ear node.
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A peduncle of a maize ear, below the lowest ear node.
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ear sessile spikelet [PO:0006349; plant anatomy term ]
Ultimate sessile inflorescence branch of the maize ear that develops from the spikelet pair meristem.
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Ultimate sessile inflorescence branch of the maize ear that develops from the spikelet pair meristem.
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ear spikelet [PO:0006320; plant anatomy term ]
A spikelet (PO:0009051) that is part of the ear inflorescence (PO:0020136) and bears a single ear floret (PO:0006354) at maturity.
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A spikelet (PO:0009051) that is part of the ear inflorescence (PO:0020136) and bears a single ear floret (PO:0006354) at maturity.
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ear spikelet meristem [PO:0006378; plant anatomy term ]
Apical meristem that gives rise to the upper and lower florets of the maize ear spikelet.
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Apical meristem that gives rise to the upper and lower florets of the maize ear spikelet.
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ear spikelet pair meristem [PO:0006360; plant anatomy term ]
An ear inflorescence branch meristem (PO:0009110) that produces two ear spikelet meristems (PO:0006378), each of which produces two flower meristems (PO:0000229) in an ear inflorescence (PO:0020136).
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An ear inflorescence branch meristem (PO:0009110) that produces two ear spikelet meristems (PO:0006378), each of which produces two flower meristems (PO:0000229) in an ear inflorescence (PO:0020136).
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ear spikelet rachilla [PO:0006380; plant anatomy term ]
The axis of the ear spikelet, above the glumes.
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The axis of the ear spikelet, above the glumes.
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early wood [PO:0004515; plant anatomy term ]
A portion of secondary xylem (PO:0005848) that is a part of a growth ring (PO:0004514) formed during the early part of a growing season, has lower density than late wood (PO:0004516) of the same growth ring, and has as parts early wood tracheary elements (PO:0025461) with generally larger lumens than the late wood tracheary elements (PO:0025462) of the same growth ring.
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A portion of secondary xylem (PO:0005848) that is a part of a growth ring (PO:0004514) formed during the early part of a growing season, has lower density than late wood (PO:0004516) of the same growth ring, and has as parts early wood tracheary elements (PO:0025461) with generally larger lumens than the late wood tracheary elements (PO:0025462) of the same growth ring.
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early wood tracheary element [PO:0025461; plant anatomy term ]
A tracheary element that is part of a portion of early wood (PO:0004515).
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A tracheary element that is part of a portion of early wood (PO:0004515).
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egg apparatus [PO:0020096; plant anatomy term ]
A cardinal organ part that has as parts an egg cell and two synergids and is located at the micropylar end of the embryo sac.
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A cardinal organ part that has as parts an egg cell and two synergids and is located at the micropylar end of the embryo sac.
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eighth order inflorescence branch [PO:0025110; plant anatomy term ]
An inflorescence branch (PO:0009081) arising from an seventh order inflorescence branch (PO:0025109).
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An inflorescence branch (PO:0009081) arising from an seventh order inflorescence branch (PO:0025109).
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eighth order infructescence branch [PO:0025254; plant anatomy term ]
An infructescence branch (PO:0025243) arising from a seventh order infructescence branch (PO:0025253).
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An infructescence branch (PO:0025243) arising from a seventh order infructescence branch (PO:0025253).
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elaiosome [PO:0020062; plant anatomy term ]
A cardinal organ part that is an oil-secreting outgrowth of a seed or fruit.
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A cardinal organ part that is an oil-secreting outgrowth of a seed or fruit.
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embryo apical cell [PO:0025284; plant anatomy term ]
A sporophyte meristematic apical cell that is part of a plant embryo and is the uppermost cell formed after the first division of a zygote.
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A sporophyte meristematic apical cell that is part of a plant embryo and is the uppermost cell formed after the first division of a zygote.
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embryo basal cell [PO:0002002; plant anatomy term ]
A native plant cell (PO:0025606) that is the lower-most cell formed after the first division of the plant zygote (PO:0000423) and is part of a plant embryo (PO:0009009).
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A native plant cell (PO:0025606) that is the lower-most cell formed after the first division of the plant zygote (PO:0000423) and is part of a plant embryo (PO:0009009).
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embryo coleorhiza [PO:0025288; plant anatomy term ]
A coleorhiza (PO:0020034) that is part of a plant embryo (PO:0009009).
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A coleorhiza (PO:0020034) that is part of a plant embryo (PO:0009009).
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embryo cortex [PO:0005014; plant anatomy term ]
A portion of cortex (PO:0005708) that is part of a plant embryo (PO:0009009).
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A portion of cortex (PO:0005708) that is part of a plant embryo (PO:0009009).
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embryo endodermis [PO:0005015; plant anatomy term ]
A portion of endodermis (PO:0000252) that is part of an plant embryo (PO:0009009).
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A portion of endodermis (PO:0000252) that is part of an plant embryo (PO:0009009).
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embryo epicotyl [PO:0025292; plant anatomy term ]
An epicotyl (PO:0020035) that is part of a plant embryo (PO:0009009).
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An epicotyl (PO:0020035) that is part of a plant embryo (PO:0009009).
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embryo hypocotyl [PO:0025290; plant anatomy term ]
A hypocotyl (PO:0020100) that is part of a plant embryo axis (PO:0019018).
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A hypocotyl (PO:0020100) that is part of a plant embryo axis (PO:0019018).
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embryo hypocotyl-root junction [PO:0025300; plant anatomy term ]
A hypocotyl-root junction (PO:0004724) that is part of an plant embryo axis (PO:0019018).
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A hypocotyl-root junction (PO:0004724) that is part of an plant embryo axis (PO:0019018).
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embryo hypophysis [PO:0020109; plant anatomy term ]
A native plant cell (PO:0025606) that is the uppermost cell of a suspensor (PO:0020108) and from which part of the root (PO:0009005) and root cap (PO:0020123) in a plant embryo (PO:0009009) of angiosperms are derived.
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A native plant cell (PO:0025606) that is the uppermost cell of a suspensor (PO:0020108) and from which part of the root (PO:0009005) and root cap (PO:0020123) in a plant embryo (PO:0009009) of angiosperms are derived.
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embryo leaf [PO:0006338; plant anatomy term ]
A vascular leaf that is part of a plant embryo and is one of the first few leaves to develop from the embryonic shoot apical meristem.
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A vascular leaf that is part of a plant embryo and is one of the first few leaves to develop from the embryonic shoot apical meristem.
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embryo mesocotyl [PO:0025294; plant anatomy term ]
A mesocotyl (PO:0020037) that is part of a plant embryo (PO:0009009).
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A mesocotyl (PO:0020037) that is part of a plant embryo (PO:0009009).
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embryo plant cell [PO:0025028; plant anatomy term ]
A native plant cell (PO:0025606) that is part of a plant embryo (PO:0009009).
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A native plant cell (PO:0025606) that is part of a plant embryo (PO:0009009).
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embryo plant structure [PO:0025099; plant anatomy term ]
A plant structure (PO:0009011) that is part of an plant embryo (PO:0009009).
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A plant structure (PO:0009011) that is part of an plant embryo (PO:0009009).
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embryo root [PO:0000045; plant anatomy term ]
A root (PO:0009005) that is initiated in a developing plant embryo (PO:0009009).
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A root (PO:0009005) that is initiated in a developing plant embryo (PO:0009009).
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embryo sac [PO:0025074; plant anatomy term ]
A megagametophyte (PO:0025279) that is located in a plant ovary ovule (PO:0025490).
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A megagametophyte (PO:0025279) that is located in a plant ovary ovule (PO:0025490).
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embryo sac cell [PO:0025026; plant anatomy term ]
A native plant cell (PO:0025606) that is part of an embryo sac (PO:0025074).
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A native plant cell (PO:0025606) that is part of an embryo sac (PO:0025074).
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embryo sac central cell [PO:0020090; plant anatomy term ]
An embryo sac cell (PO:0025026) that is largest cell in a mature embryo sac (PO:0025074).
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An embryo sac cell (PO:0025026) that is largest cell in a mature embryo sac (PO:0025074).
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embryo sac egg cell [PO:0025123; plant anatomy term ]
A plant egg cell (PO:0020094) that is part of an egg apparatus (PO:0020096).
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A plant egg cell (PO:0020094) that is part of an egg apparatus (PO:0020096).
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embryo shoot apical meristem [PO:0006362; plant anatomy term ]
A vegetative shoot apical meristem at the apex of the embryonic axis.
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A vegetative shoot apical meristem at the apex of the embryonic axis.
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embryogenic callus [PO:0006091; plant anatomy term ]
A cultured plant callus (PO:0000009) that is capable of forming somatic embryos.
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A cultured plant callus (PO:0000009) that is capable of forming somatic embryos.
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endarch protoxylem [PO:0025557; plant anatomy term ]
A portion of protoxylem (PO:0000272) tissue in which the maturation of primary xylem (PO:0005849) of the shoot system (PO:0009006) progresses centrifugally, with the oldest elements (protoxylem) towards the center of the plant axis (PO:0025004).
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A portion of protoxylem (PO:0000272) tissue in which the maturation of primary xylem (PO:0005849) of the shoot system (PO:0009006) progresses centrifugally, with the oldest elements (protoxylem) towards the center of the plant axis (PO:0025004).
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endocarp [PO:0009086; plant anatomy term ]
A portion of plant tissue (PO:0009007) that is the innermost differentiated layer of a pericarp (PO:0009084).
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A portion of plant tissue (PO:0009007) that is the innermost differentiated layer of a pericarp (PO:0009084).
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endodermal passage cell [PO:0006208; plant anatomy term ]
Cell in the endodermal layer of the root with cell wall that remains non-thickened.
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Cell in the endodermal layer of the root with cell wall that remains non-thickened.
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endodermis [PO:0000252; plant anatomy term ]
A portion of ground tissue (PO:0025059) that is the inner most layer of a cortex (PO:0005708) and has a casparian strip in its anticlinal cell walls.
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A portion of ground tissue (PO:0025059) that is the inner most layer of a cortex (PO:0005708) and has a casparian strip in its anticlinal cell walls.
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endosperm [PO:0009089; plant anatomy term ]
A maximal portion of nutritive plant tissue in a seed.
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A maximal portion of nutritive plant tissue in a seed.
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endosperm parenchyma [PO:0005415; plant anatomy term ]
A portion of seed storage parenchyma that is part of an endosperm.
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A portion of seed storage parenchyma that is part of an endosperm.
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endotegmen [PO:0006219; plant anatomy term ]
That part of the seed coat that develops from the inner epidermis of the inner integument.
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That part of the seed coat that develops from the inner epidermis of the inner integument.
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endotesta [PO:0006051; plant anatomy term ]
That part of the seed coat that develops from the inner epidermis of the outer integument.
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That part of the seed coat that develops from the inner epidermis of the outer integument.
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endothelium [PO:0020024; plant anatomy term ]
A portion of plant tissue composed of cells of the inner epidermis of the inner (or only) integument of the ovule that are radially elongated and metabolically very active.
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A portion of plant tissue composed of cells of the inner epidermis of the inner (or only) integument of the ovule that are radially elongated and metabolically very active.
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ensiform vascular leaf [PO:0025333; plant anatomy term ]
A unifacial leaf that is flat in cross section due to a lamina that develops in a median plane (perpendicular to the axis), rather a transverse plane (tangent to the axis) throughout all of part of the length of the leaf.
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A unifacial leaf that is flat in cross section due to a lamina that develops in a median plane (perpendicular to the axis), rather a transverse plane (tangent to the axis) throughout all of part of the length of the leaf.
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epiblast [PO:0020036; plant anatomy term ]
A portion of plant tissue that is a flap-like projection of the coleorhiza, inserted opposite the scutellum.
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A portion of plant tissue that is a flap-like projection of the coleorhiza, inserted opposite the scutellum.
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epicalyx [PO:0009063; plant anatomy term ]
A collective phyllome structure (PO:0025023) composed of two or more phyllomes immediately outside the calyx (PO:0009060).
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A collective phyllome structure (PO:0025023) composed of two or more phyllomes immediately outside the calyx (PO:0009060).
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epicalyx bract [PO:0025577; plant anatomy term ]
A flower bract (PO:0009034) that is part of the epicalyx (PO:0009063).
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A flower bract (PO:0009034) that is part of the epicalyx (PO:0009063).
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epicormic shoot system [PO:0004546; plant anatomy term ]
A shoot-borne shoot system (PO:0004546) developing from a stem (PO:0009047).
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A shoot-borne shoot system (PO:0004546) developing from a stem (PO:0009047).
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epicotyl [PO:0020035; plant anatomy term ]
The first stem internode (PO:0020142) above the cotyledonary node (PO:0025321) of a plant embryo (PO:0009009) or a seedling (PO:0000003).
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The first stem internode (PO:0020142) above the cotyledonary node (PO:0025321) of a plant embryo (PO:0009009) or a seedling (PO:0000003).
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epicuticular wax [PO:0025388; plant anatomy term ]
A portion of cuticular wax (PO:0025386) that forms crystalloids or a smooth film on the exterior of a plant cuticle (PO:0000022).
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A portion of cuticular wax (PO:0025386) that forms crystalloids or a smooth film on the exterior of a plant cuticle (PO:0000022).
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epidermal cell [PO:0004013; plant anatomy term ]
A native plant cell (PO:0025606) that is part of a portion of epidermis (PO:0005679).
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A native plant cell (PO:0025606) that is part of a portion of epidermis (PO:0005679).
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epidermal cork cell [PO:0000041; plant anatomy term ]
One of the two types of short cells in the epidermis of grasses and bamboos. It is usually paired with silica cell.
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One of the two types of short cells in the epidermis of grasses and bamboos. It is usually paired with silica cell.
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epidermal initial cell [PO:0000349; plant anatomy term ]
An initial cell (PO:0004011) that is part of an epidermis (PO:0005679) and gives rise to specialized cell types of the epidermis.
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An initial cell (PO:0004011) that is part of an epidermis (PO:0005679) and gives rise to specialized cell types of the epidermis.
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epidermal pavement cell [PO:0000332; plant anatomy term ]
A shoot epidermal cell that is relatively unspecialized at maturity.
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A shoot epidermal cell that is relatively unspecialized at maturity.
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epidermal rhizoid [PO:0030071; plant anatomy term ]
A rhizoid (PO:0030078) that develops from an epidermal rhizoid initial cell (PO:0030068).
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A rhizoid (PO:0030078) that develops from an epidermal rhizoid initial cell (PO:0030068).
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epidermal rhizoid initial cell [PO:0030068; plant anatomy term ]
An epidermal initial cell (PO:0000349) that gives rise to an epidermal rhizoid (PO:0030071).
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An epidermal initial cell (PO:0000349) that gives rise to an epidermal rhizoid (PO:0030071).
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epidermis [PO:0005679; plant anatomy term ]
A portion of plant tissue (PO:0009007) composed of epidermal cells (PO:0004013) that develops from the protoderm (PO:0006210) and covers the surface of a plant structure (PO:0009011).
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A portion of plant tissue (PO:0009007) composed of epidermal cells (PO:0004013) that develops from the protoderm (PO:0006210) and covers the surface of a plant structure (PO:0009011).
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epiphragm [PO:0030054; plant anatomy term ]
A portion of parenchyma tissue that forms a circular membrane extending from a spore capsule columella and attached to the ends of the peristome teeth that covers a spore capsule mouth.
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A portion of parenchyma tissue that forms a circular membrane extending from a spore capsule columella and attached to the ends of the peristome teeth that covers a spore capsule mouth.
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epithem cell [PO:0000066; plant anatomy term ]
A parenchyma cell of the mesophyll of a hydathode found between the xylem endings and the epidermis.
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A parenchyma cell of the mesophyll of a hydathode found between the xylem endings and the epidermis.
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exarch protoxylem [PO:0025554; plant anatomy term ]
A portion of protoxylem (PO:0000272) tissue in which the maturation of primary xylem (PO:0005849) progresses centripetally, the oldest elements (protoxylem) are farthest from the center of the plant axis (PO:0025004).
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A portion of protoxylem (PO:0000272) tissue in which the maturation of primary xylem (PO:0005849) progresses centripetally, the oldest elements (protoxylem) are farthest from the center of the plant axis (PO:0025004).
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exocarp [PO:0009085; plant anatomy term ]
A portion of plant tissue (PO:0009007) that is the outer layer of a pericarp (PO:0009084).
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A portion of plant tissue (PO:0009007) that is the outer layer of a pericarp (PO:0009084).
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exodermal passage cell [PO:0006207; plant anatomy term ]
A short cell in the dimorphic type of exodermis with cell wall that remains non-thickened.
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A short cell in the dimorphic type of exodermis with cell wall that remains non-thickened.
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exodermis [PO:0005772; plant anatomy term ]
The sub-epidermal layer or layers of cells of the root similar in structure and cytochemical characteristics of the endodermis, the outermost layer or layers of cells of the cortex.
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The sub-epidermal layer or layers of cells of the root similar in structure and cytochemical characteristics of the endodermis, the outermost layer or layers of cells of the cortex.
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exotegmen [PO:0006218; plant anatomy term ]
That part of the seed coat that develops from the outer surface of the inner integument.
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That part of the seed coat that develops from the outer surface of the inner integument.
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exotesta [PO:0006050; plant anatomy term ]
That part of the seed coat that develops from the outer surface of the outer integument.
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That part of the seed coat that develops from the outer surface of the outer integument.
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exothecium [PO:0030073; plant anatomy term ]
A portion of epidermis that is the outermost layer of a sporangium wall.
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A portion of epidermis that is the outermost layer of a sporangium wall.
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extrafloral nectary [PO:0009057; plant anatomy term ]
A multicellular glandular structure found in places other than flower secreting a liquid containing organic substances especially sugar.
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A multicellular glandular structure found in places other than flower secreting a liquid containing organic substances especially sugar.
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Plant Ontology (PO) by www.plantontology.org is licensed under a Creative Commons Attribution 4.0 International License. Based on a work at www.plantontology.org.
Plant Ontology is an international collaborative effort and is supported by primary funding (IOS:0822201 award) from the National Science Foundation of USA.
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