Glossary of Plant Anatomy

rachilla of pedicellate spikelet of ear [PO:0006435; plant anatomy term ]
The axis of the ear pedicellate spikelet, above the glumes.
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rachilla of pedicellate spikelet of tassel [PO:0006390; plant anatomy term ]
The axis of the tassel pedicellate spikelet, above the glumes.
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rachilla of sessile spikelet of ear [PO:0006436; plant anatomy term ]
The axis of the ear sessile spikelet, above the glumes.
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rachilla of sessile spikelet of tassel [PO:0006389; plant anatomy term ]
The axis of the tassel sessile spikelet, above the glumes.
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radicle [PO:0020031; plant anatomy term ]
An embryo root (PO:0000045) that is the basal continuation of a hypocotyl (PO:0020100) in a plant embryo (PO:0009009) or a seedling (PO:0000003).
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raphe [PO:0020027; plant anatomy term ]
A cardinal organ part (PO:0025001) that is a ridge on a plant ovule (PO:0020003) where a funicle (PO:0020006) is or was fused to the ovule.
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ray flower [PO:0025331; plant anatomy term ]
A small pistillate flower (PO:0025599) on the margin of a head-type (capitulum) inflorescence (PO:0009049).
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ray initial cell [PO:0000082; plant anatomy term ]
A cambial initial cell (PO:0000295) that gives rise to ray cells of the secondary xylem (PO:0005848) and secondary phloem (PO:0005043).
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ray secondary xylem parenchyma [PO:0004534; plant anatomy term ]
A portion of secondary xylem parenchyma (PO:0004532) that is part of a ray system (PO:0025411) and has as parts ray secondary xylem parenchyma cells (PO:0004527).
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ray secondary xylem parenchyma cell [PO:0004527; plant anatomy term ]
A parenchyma cell (PO:0000074) that develops from a ray initial (PO:0000082) and is part of a portion of ray secondary xylem parenchyma (PO:0004534).
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ray system [PO:0025411; plant anatomy term ]
A portion of secondary vascular tissue (PO:0025409) that has as part ray wood parenchyma (PO:0004534) and extends radially in the secondary xylem (PO:0005848) and secondary phloem (PO:0005848) of a plant axis (PO:0025004).
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reaction wood [PO:0025472; plant anatomy term ]
A portion of secondary xylem (PO:0005848) found on either the upper or lower side of a shoot axis (PO:0025029) that is or was angled away from vertical, with anatomical characteristics that depend on whether it is compression wood (PO:0025473) or tension wood (PO:0025474).
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receptacle [PO:0009064; plant anatomy term ]
A cardinal organ part (PO:0025001) that is the region at the distal end of either a peduncle or a pedicel where the floral appendages (e.g.: sepals, petals, stamens and pistils) are attached.
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receptacle cortex [PO:0025591; plant anatomy term ]
A portion of cortex (PO:0005708) that is part of a receptacle (PO:0009064).
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receptacle pith [PO:0025590; plant anatomy term ]
A portion of pith (PO:0006109) that is part of a receptacle (PO:0009064).
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reproductive bud [PO:0025084; plant anatomy term ]
A bud that develops into a reproductive shoot system.
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reproductive shoot apex [PO:0025222; plant anatomy term ]
A shoot apex that has as part a reproductive shoot apical meristem.
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reproductive shoot apical meristem [PO:0008028; plant anatomy term ]
A shoot apical meristem (PO:0020148) that gives rise to the apical growth of reproductive tissues and organs.
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reproductive shoot system [PO:0025082; plant anatomy term ]
A shoot system (PO:0009006) in the sporophytic phase that has as part at least one sporangium (PO:0025094).
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resin canal [PO:0005665; plant anatomy term ]
A canal (PO:0025132) of schizogenous origin, lined with secretory resin cells (PO:0025604) and containing plant resin (PO:0025603).
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resin cell [PO:0025604; plant anatomy term ]
An epidermal cell (PO:0004013) that secretes plant resin (PO:0025603), and may line resin canals (PO:0005665) and/or be associated with resin blisters (or cysts).
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rhizoid [PO:0030078; plant anatomy term ]
A plant structure (PO:0009011) that is a uniseriate filament with positive geotropism that grows from an epidermis (PO:0005679) or protonema (PO:0030003).
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rhizoid meristematic apical cell [PO:0030080; plant anatomy term ]
A gametophyte meristematic apical cell that is part of a rhizoid.
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rhizome [PO:0004542; plant anatomy term ]
A swollen shoot axis (PO:0025029) that grows horizontally at or below the substrate surface and produces shoots above and roots or rhizoids below.
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rhizome internode [PO:0025204; plant anatomy term ]
A shoot axis internode (PO:0005005) that is part of a rhizome (PO:0004542).
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rhizome scale leaf [PO:0025278; plant anatomy term ]
A scale leaf that grows from a rhizome.
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rib zone [PO:0000226; plant anatomy term ]
The region of the shoot apical meristem that lies below the central zone and is flanked by the peripheral zone.
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root [PO:0009005; plant anatomy term ]
A plant axis (PO:0025004) that lacks shoot axis nodes (PO:0005004), grows indeterminately, and is usually positively geotropic.
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root aerenchyma [PO:0006213; plant anatomy term ]
Parenchyma tissue containing particularly large intercellular spaces in the tissue of roots.
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root anlagen [PO:0025433; plant anatomy term ]
A portion of meristem tissue (PO:0009013) that is committed to the development of a root primordium (PO:0005029).
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root apical meristem [PO:0020147; plant anatomy term ]
A root meristem (PO:0006085) located at the root tip (PO:0000025), behind the root cap (PO:0020123).
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root cambial zone [PO:0025441; plant anatomy term ]
A cambial zone that is part of a root (PO:0009005).
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root cap [PO:0020123; plant anatomy term ]
A portion of root parenchyma (PO:0025095) tissue that is part of the root tip (PO:0000025) and covers the root apical meristem (PO:0020147).
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root cap of lateral root [PO:0003018; plant anatomy term ]
A root cap that is part of a lateral root tip.
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root cap of primary root [PO:0003017; plant anatomy term ]
A root cap that is part of a primary root tip.
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root cork cambium [PO:0025436; plant anatomy term ]
A cork cambium (PO:0005599) that is part of a root (PO:0009005).
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root cortex [PO:0000258; plant anatomy term ]
A portion of cortex (PO:0005708) that is part of a root (PO:0009005).
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root cortex-endodermis initial cell [PO:0000060; plant anatomy term ]
A root initial cell that produces root cortex and endodermis. In direct contact with quiescent center.
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root differentiation zone [PO:0020135; plant anatomy term ]
A plant axis differentiation zone that is the part of a root and is located behind a root elongation zone.
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root elongation zone [PO:0025181; plant anatomy term ]
A plant axis elongation zone that is part of a root tip and located directly behind the root apical meristem.
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root endodermis [PO:0005059; plant anatomy term ]
A portion of endodermis that is part of a root cortex.
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root epidermal cell [PO:0025164; plant anatomy term ]
An epidermal cell that is part of a root epidermis.
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root epidermis [PO:0006036; plant anatomy term ]
A portion of epidermis that is part of a root system.
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root giant cell [PO:0005026; plant anatomy term ]
Multinucleate cell developed by a series of events involving kayokinesis but not cytokinesis of the initial feeding cell. The events are induced by root knot nematodes (e.g., Meloidogyne sp. ) entering the feeding cells (any cells) of the root vascular system.
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root hair cell [PO:0000256; plant anatomy term ]
A root epidermal cell (PO:0025164) that develops from a trichoblast (PO:0000262) and has as part a root hair (GO:0035618).
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root initial cell [PO:0000059; plant anatomy term ]
An initial cell that is part of a root apical meristem and by division gives rise to two cells, one of which remains in the meristem, while the other is produces different root cells.
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root lateral meristem [PO:0006308; plant anatomy term ]
A lateral meristem (PO:0020145) that is part of a root (PO:0009005).
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root meristem [PO:0006085; plant anatomy term ]
A portion of meristem tissue (PO:0009013) that gives rise to a root (PO:0009005).
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root meristematic apical cell [PO:0030008; plant anatomy term ]
A sporophyte meristematic apical cell that is part of a root tip.
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root nodule [PO:0003023; plant anatomy term ]
A cardinal organ part (PO:0025001) that is an outgrowth of a root (PO:0009005) and is inhabited by nitrogen-fixing bacteria.
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root nodule meristem [PO:0025194; plant anatomy term ]
A root meristem (PO:0006085) that gives rise to a root nodule (PO:0003023).
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root parenchyma [PO:0025095; plant anatomy term ]
A portion of parenchyma tissue (PO:0005421) that is part of a root (PO:0009005).
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root periderm [PO:0005047; plant anatomy term ]
A portion of periderm that is part of a root.
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root perimedullary zone [PO:0025065; plant anatomy term ]
A perimedullary zone that is part of a root pith.
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root pith [PO:0005040; plant anatomy term ]
A portion of pith (PO:0006109) that is part of a root stele (PO:0020124).
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root prickle [PO:0025170; plant anatomy term ]
A prickle that is part of a root.
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root primordium [PO:0005029; plant anatomy term ]
A primordium (PO:0025127) that develops from a root anlagen (PO:0025433) and is committed to the development of a root (PO:0009005).
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root procambium [PO:0006307; plant anatomy term ]
A portion of procambium (PO:0025275) tissue that undergoes differentiation to form the primary vascular tissue (PO:0025408) of a root (PO:0009005).
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root secondary thickening meristem [PO:0025443; plant anatomy term ]
A secondary thickening meristem (PO:0025414) that is part of a root (PO:0009005).
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root stele [PO:0020124; plant anatomy term ]
A stele (PO:0025197) that is part of a root (PO:0009005).
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root syncytium cell [PO:0005027; plant anatomy term ]
Multinucleate cell developed by a series of events involving fusion with the neighboring dividing cells. The events are induced by cyst nematodes (e.g. Heterodera schachtii) entering the feeding cells (any cells) of the root vascular system.
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root system [PO:0025025; plant anatomy term ]
A collective plant organ structure (PO:0025007) that produces root meristems (PO:0006085), the plant structures (PO:0009011) that arise from them and the parts thereof.
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root system exarch protoxylem [PO:0025555; plant anatomy term ]
A portion of exarch protoxylem (PO:002554) tissue in which the maturation of primary xylem (PO:0005849) of the root system (PO:0025025) progresses centripedally, with the oldest elements (protoxylem) farthest from the center of the plant axis (PO:0025004).
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root system ground meristem [PO:0025596; plant anatomy term ]
A ground meristem (PO:0025594) that gives rise to a portion of ground tissue (PO:0025059) in the root system (PO:0025025).
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root system phloem sap [PO:0025567; plant anatomy term ]
A phloem sap (PO:0025540) that is located in the root system (PO:0025025).
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root system xylem sap [PO:0025568; plant anatomy term ]
A xylem sap (PO:0025539) that is located in the root system (PO:0025025).
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root tip [PO:0000025; plant anatomy term ]
The apical most portion of the root (PO:0009005) including the root apical meristem (PO:0020147) and root cap (PO:0020123).
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root vascular cambium [PO:0025438; plant anatomy term ]
A vascular cambium (PO:0005598) that is part of a root (PO:0009005).
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root vascular system [PO:0003011; plant anatomy term ]
A vascular system that includes the totality of the portions of vascular tissue in their specific arrangement in a root.
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root-borne shoot system [PO:0004544; plant anatomy term ]
A shoot system that is initiated from a root.
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root-derived cultured plant cell [PO:0000008; plant anatomy term ]
A cultured plant cell that was derived from root tissue.
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rosette [PO:0025615; plant anatomy term ]
A collective leaf structure (PO:0025022) consisting of a group of rosette leaves (PO:0000014), generally borne at the base of the plant, that are separated by very short stem internodes (PO:0020142).
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rosette leaf [PO:0000014; plant anatomy term ]
A vascular leaf (PO:0009025) born in a circular pattern around a stem (PO:0009047) with compressed stem internodes (PO:0020142).
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rosette paraclade [PO:0025548; plant anatomy term ]
A primary inflorescence branch (PO:0006321) borne on the compacted first order inflorescence axis (PO:0025104), forming the rosette.
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