!TAIR_ontology.defs !version: $Revision: 1.4 $ !date: $Date: 2002-02-27 15:03:49 $ !saved-by: lreiser !autogenerated-by: DAG-Edit version 1.300-beta ! term: 10 rosette leaf goid: TAIR:1111413 definition: stage at which the first 10 leaves have reached > 1mm length. definition_reference: PMID:11449047 term: 11 rosette leaf goid: TAIR:1111414 definition: stage at which the first 11 leaves have reached > 1 mm length. definition_reference: PMID:11449047 term: 12 rosette stage goid: TAIR:1111415 definition: stage at which the first 12 leaves have reached > 1mm length. definition_reference: PMID:11449047 term: 13 rosette leaf goid: TAIR:1111416 definition: stage at which the first 13 leaves have reached > 1mm length. definition_reference: PMID:11449047 term: 14 rosette leaf goid: TAIR:1111417 definition: stage at which the first 14 leaves have reached > 1mm length. definition_reference: PMID:11449047 term: 2 rosette leaf goid: TAIR:1111398 definition: stage at which the first two rosette leaves have reached > 1 mm in length. definition_reference: PMID:11449047 term: 3 rosette leaf goid: TAIR:1111407 definition: stage at which the first 3 rosette leaves have reached > 1 mm in length. definition_reference: PMID:11449047 term: 4 rosette leaf goid: TAIR:1111399 definition: stage at which the first 4 rosette leaves have reached > 1mm in length. definition_reference: PMID:11449047 term: 5 rosette leaf goid: TAIR:1111408 definition: stage at which the first 5 leaves have reached > 1 mm length. definition_reference: PMID:11449047 term: 6 rosette leaf goid: TAIR:1111409 definition: stage at which the first 6 leaves have reached > 1 mm in length. definition_reference: PMID:11449047 term: 7 rosette leaf goid: TAIR:1111410 definition: stage at which the first 7 leaves have reached > 1 mm length. definition_reference: PMID:11449047 term: 8 rosette leaf goid: TAIR:1111411 definition: stage at which the first 8 leaves have reached > 1 mm length. definition_reference: PMID:11449047 term: 9 rosette leaf goid: TAIR:1111412 definition: stage at which the first 9 leaves have reached > 1 mm length. definition_reference: PMID:1 term: abscission zone goid: TAIR:1111146 definition: Zone at base of leaf, flower, fruit, or other plant part that contains an abscission (or separation) layer and a protective layer, both involved in the abscission of the plant part. definition_reference: ISBN:047124529 term: adult leaf goid: TAIR:1111118 definition: a leaf with waxes, cell types or other features characteristic of leaves in an adult (reproductive )phase definition_reference: TAIR:lr term: aerenchyma cell goid: TAIR:1111294 definition: Parenchyma tissue containing particularly large intercellular spaces of schizogenous, lysigenous, or rhexigenous origin. definition_reference: ISBN:047124529 term: aleurone layer goid: TAIR:1111308 definition: Outermost layer of endosperm in cereals and many other taxa that contains protein bodies and enzymes concerned with endosperm digestion. definition_reference: ISBN:047124529 term: anatomy goid: TAIR:1111111 definition: the structure of an organism definition_reference: :http //www.academicpress.com/inscight/11261996/anatomy1.htm term: anther goid: TAIR:1111155 definition: The pollen-bearing part of the stamen. definition_reference: ISBN:047125208 term: antipodal cell goid: TAIR:1111192 definition: cells located at the chalazal end of the mature embryo sac in angiosperms definition_reference: ISBN:047125208 term: aperture goid: TAIR:1111299 definition: A depressed region in the pollen wall in which thick intine is covered by thin exine; the pollen grain emerges through the aperture. definition_reference: ISBN:0471245208 term: apical cell goid: TAIR:1111178 definition: the uppermost cell formed after the first division of the zygote. definition_reference: TAIR:lr term: atrichoblast goid: TAIR:1111263 definition: cell formed after asymmetric division of root epidermal cell that does not give rise to a root hair definition_reference: ISBN:0387987819 term: axillary shoot goid: TAIR:1111338 definition: shoot formed formed axillary to the primary shoot meristem. definition_reference: TAIR:lr term: basal cell goid: TAIR:1111179 definition: the lowermost cell formed after the first division of the zygote. definition_reference: TAIR:lr term: cambial initial goid: TAIR:1111295 definition: Cells so localized in the vascular cambium or phellogen that their periclinal divisions can contribute cells either to the outside or to the inside of the axis; in vascular cambium, classified into fusiform initials (source of axial cells of xylem and phloem) and ray initials (source of the ray cells). definition_reference: ISBN:047124529 term: carpel goid: TAIR:1111126 definition: Leaflike organ in angiosperms producing one or more ovules; a constituent of the gynoecium. definition_reference: ISBN:047124529 term: casparian strip goid: TAIR:1111257 definition: A band like wall formation within primary walls that contains suberin and lignin; typical of endodermal cells in roots, in which it occurs in radial and transverse anticlinal walls. definition_reference: ISBN:047124529 term: central cell goid: TAIR:1111194 definition: cell type containing the two polar nuclei which, after double fertilization, will develop into the endosperm. definition_reference: TAIR:lr term: central root cap goid: TAIR:1111254 definition: The central part of a rootcap in which the cells are arranged in longitudinal files. definition_reference: ISBN:047124529 term: central zone goid: TAIR:1111224 definition: An area of densely cytoplasmic cells that divide infrequently. Functions as a population of stem cells that replenishes the meristem. definition_reference: TAIR:lr definition_reference: ISBN:0521288959 term: chalaza goid: TAIR:1111237 definition: Region in the ovule opposite the micropyle where the integuments and the nucellus merge with the funiculus. definition_reference: ISBN:047125208 term: chalazal endosperm goid: TAIR:1111201 definition: the portion of the endosperm located nearest the chalazal region of the ovule. definition_reference: TAIR:lr definition_reference: ISBN:047124529 term: chlorenchyma goid: TAIR:1111241 definition: Parenchyma containing chloroplasts; a component of leaf mesophyll and other green parenchyma. definition_reference: ISBN:047124529 term: collenchyma goid: TAIR:1111209 definition: Elongated living cells with unevenly thickened nonlignified primary walls. Common in regions of primary growth in stems and leaves. definition_reference: ISBN:047124529 term: complete rosette goid: TAIR:1111418 definition: stage at whichleaf growth has ceased and the rosette no longer increases in size. definition_reference: PMID:11449047 term: cotyledon goid: TAIR:1111138 definition: Leaf or leaf-like organ formed during embryogenesis. Specialization includes accumulation of storage reserves that are mobilized during seed germination. definition_reference: TAIR:lr term: cotyledon abaxial epidermis goid: TAIR:1111211 definition: epidermal layer of the cotyledon facing away from the axis. definition_reference: TAIR:lr term: cotyledon adaxial epidermis goid: TAIR:1111210 definition: epidermal layer located on the side of the cotyledon facing the axis, definition_reference: TAIR:lr term: cotyledon primordium goid: TAIR:1111365 definition: the earliest differentiated state of a cotyledon. definition_reference: TAIR:lr definition_reference: ISBN:047125208 term: cotyledon vascular system goid: TAIR:1111119 definition: vascular system formed in cotyledons definition_reference: TAIR:lr term: curled cotyledon stage goid: TAIR:1111320 definition: The stage at which the cotyledons curvedown towards the suspensor. At this time protein deposition in the cotyledons begins. definition_reference: ISBN:0387940898 term: degenerate megaspore goid: TAIR:1111245 definition: in monosporic and bisporic megasporogenesis: the megaspore(s) that do not participate in megagametogenesis. definition_reference: TAIR:lr term: dermatogen stage goid: TAIR:1111369 definition: The stage at which the embryo has undergone three mitotic divisions and contains sixteen cells. The outer protodermal cells will give rise to the epidermis through a series of anticlinal divisions. Development of the suspensor is complete at this stage. definition_reference: ISBN:0387094898 term: egg apparatus goid: TAIR:1111189 definition: The egg cell and two synergids located at the micropylar end of the female gametophyte, or the embryo sac, in angiosperms. definition_reference: ISBN:047125208 term: egg cell goid: TAIR:1111190 definition: the female gamete definition_reference: TAIR:lr term: eight-celled stage goid: TAIR:1111180 definition: An embryo comprised of eight cell. The mitotic divisions leading to this stage do not cause a significant increase in size. definition_reference: ISBN:0387094898 term: elongation zone goid: TAIR:1111324 definition: the portion of the root that includes small, densely cytoplasmic cells that are dividing and expanding in size. definition_reference: ISBN:0879694289 term: embryo goid: TAIR:1111172 definition: a product of fertilization that represents the next (sporophytic) generation definition_reference: TAIR:lr term: embryonic goid: TAIR:1111374 definition: stages of development that occur after fertilization and before germination. definition_reference: TAIR:lr term: embryonic axis goid: TAIR:1111387 definition: the stem component of the embryo. definition_reference: TAIR:lr term: embryonic ground tissue goid: TAIR:1111367 definition: ground tissue (parenchymatous) layers found in the embryo. definition_reference: TAIR:lr term: endodermis goid: TAIR:1111252 definition: The layer of ground tissue forming a sheath around the vascular region and having the casparian strip in its anticlinal walls; may have secondary walls later. It is the innermost layer of the cortex in roots and stems of seed plants. definition_reference: ISBN:047124529 term: endosperm goid: TAIR:1111197 definition: The nutritive tissue formed within the embryo sac of angiosperms from the central cell containing the primary endosperm nucleus. definition_reference: ISBN:047125208 term: endothecium goid: TAIR:1111158 definition: A wall layer in the anther, usually with secondary wall thickenings. definition_reference: TAIR:047125208 term: epidermal initial goid: TAIR:1111349 definition: a relatively unspecialized cell that will give rise to specialized cell types of the epidermis definition_reference: TAIR:lr term: epidermis goid: TAIR:1111202 definition: the outer layer of cells in the plant body, primary in origin. definition_reference: ISBN:0471245208 term: fasicular cambium goid: TAIR:1111360 definition: Vascular cambium originating from procambium within a vascular bundle, or fascicle. definition_reference: ISBN:047124529 term: fiber tracheid goid: TAIR:1111355 definition: A fiberlike tracheid in the secondary xylem; commonly thick walled, with pointed ends and bordered pits that have lenticular to slitlike apertures. definition_reference: ISBN:047124529 term: filliform apparatus goid: TAIR:1111193 definition: A complex of cell wall invaginations in a synergid cell similar to those in transfer cells. definition_reference: ISBN:0471245208 term: first open flower goid: TAIR:1111421 definition: whole plant stage at which the first flower has reached stage 13 (fully open, pollen dehiscence). definition_reference: PMID:11449047 term: floral organ goid: TAIR:1111122 definition: an organ that is part of the flower: the sexual reproductive structure of Angiosperms. definition_reference: TAIR:lr term: functional megaspore goid: TAIR:1111244 definition: in monosporic and bisporic megasporogenesis: the megaspore(s) that will undergo megagametogenesis. definition_reference: TAIR:lr term: funiculus goid: TAIR:1111239 definition: The stalk of the ovule. definition_reference: ISBN:047124529 term: gametophyte goid: TAIR:1111427 definition: the haploid organism (or phase) which bears (forms)the gametes, definition_reference: TAIR:lr term: generative cell goid: TAIR:1111168 definition: The cell that will give rise to the generative nuclei which will participate in fertilization definition_reference: TAIR:lr term: guard cell goid: TAIR:1111293 definition: one of a pair of cells flanking the stomatal pore and causing the opening and closing of the pore by changes in turgor. definition_reference: ISBN:047124529 term: guard mother cell goid: TAIR:1111351 definition: epidermal cell that that divides to produce the guard cells. definition_reference: ISBN:047124529 term: gynoecium goid: TAIR:1111326 definition: Collective term for the carpels in an angiosperm flower; part of the flower in which female gametogenesis occurs. definition_reference: ISBN:047124529 term: heart stage goid: TAIR:1111186 definition: Embryonic stage at which the cotyledon primordia have enlarged enough to form two mounds on either side of the apical meristem. definition_reference: ISBN:03870940898 definition_reference: TAIR:lr term: hydathode goid: TAIR:1111323 definition: A structural modification of vascular and ground tissues, usually in a leaf, that permits the release of water through a pore in the epidermis; may be secretory in function. definition_reference: TAIR:lr term: hypocotyl goid: TAIR:1111310 definition: the axial part of the embryo or seedling located between the cotyledon or cotyledons and the radicle. definition_reference: ISBN:0471245208 term: hypophysis goid: TAIR:1111181 definition: The uppermost cell of suspensor from which part of the root and rootcap in the embryo of angiosperms are derived. definition_reference: ISBN:047125208 term: idioblast goid: TAIR:1111283 definition: A cell in a tissue that markedly differs in form, size, or contents from other cells in the same tissue. definition_reference: ISBN:047124529 term: juvenile leaf goid: TAIR:1111216 definition: a leaf with cellular or morphologcial or anatomical characteristics of a juvenile (non-reproductive) plant. definition_reference: TAIR:lr term: lamina goid: TAIR:1111221 definition: Blade, or expanded part of the leaf. definition_reference: ISBN:047124529 term: late globular stage goid: TAIR:1111185 definition: At this stage the protoderm, procambium, hyposeal cell are present and the endosperm begins to cellularize. definition_reference: ISBN:03870940898 term: lenticel goid: TAIR:1111292 definition: An isolated region in the penderm distinguished from the phellem in having intercellular spaces; the tissue may or may not be suberized. definition_reference: ISBN:047124529 term: lower tier goid: TAIR:1111321 definition: cells formed by division of the embryonic apical cell that are distal to the apex. definition_reference: ISBN:0879694289 definition_reference: TAIR:lr term: mature goid: TAIR:1111368 definition: Stage at which the embryo has ceased to divide. definition_reference: ISBN:0387940898 term: megagametophyte goid: TAIR:1111188 definition: Haploid generation that produces the gametes in higher plants, Female gametophyte in heterosporous plants; embryo sac within the ovule in angiosperms. definition_reference: ISBN:047125208 definition_reference: TAIR:lr term: megaspore goid: TAIR:1111243 definition: A haploid (1n) spore developing into a female gametophyte in heterosporous plants. definition_reference: ISBN:0471245208 term: megasporocyte goid: TAIR:1111431 definition: A diploid (2n) cell that undergoes meiosis and produces four haploid (1n) megaspores; also called megaspore mother cell. definition_reference: ISBN:0471245208 term: metaphloem goid: TAIR:1111279 definition: Part of the primary phloem that differentiates after the protophloem and before the secondary phloem, if any of the latter is formed in a given taxon. definition_reference: TAIR:047125208 term: metaxylem goid: TAIR:1111372 definition: Part of the primary xylem that differentiates after the protoxylem and before the secondary xylem, if any of the latter is formed in a given taxon. definition_reference: ISBN:047125208 term: micropylar endosperm goid: TAIR:1111200 definition: the region of the endosperm closest to the micropylar region of the ovule. definition_reference: TAIR:lr term: micropyle goid: TAIR:1111238 definition: The opening in the integuments of an ovule through which the pollen tube usually enters the embryo sac. definition_reference: ISBN:047125208 term: microspore goid: TAIR:1111297 definition: A haploid (1n) spore developing into a male gametaphyte in heterosporous plants; the uninucleate pollen grain in seed plants. definition_reference: ISBN:0471245208 term: microsporocyte goid: TAIR:1111160 definition: A diploid (2n) cell that undergoes meiosis and forms four haploid (1n) microspores; also called microspore mother cell and, in seed plants, pollen mother cell. definition_reference: ISBN:0471245208 term: mid-globular stage goid: TAIR:1111184 definition: Stage at which the embryo under goes mitotic divisions to produce a 32 then 64- celled embryo. definition_reference: ISBN:03870940898 term: midvein goid: TAIR:1111235 definition: the central or usually most prominent vein in a leaf or leaf-like organ. definition_reference: TAIR:lr term: mucilage cell goid: TAIR:1111373 definition: Cell containing mucilages or gums or similar carbohydrate material characterized by the property of swelling in water. definition_reference: ISBN:047124529 term: myrosin cell goid: TAIR:1111352 definition: Cell containing glucosinolates ("mustard oil glucosides") and myrosinases, enzymes hydrolysing the glucosinolates. Occur in eleven dicotyledon families, the two largest of which are the Brassicaceae and Euphorbiaceae. definition_reference: ISBN:047124529 term: nectary goid: TAIR:1111123 definition: A multicellular glandular structure secreting a liquid containing organic substances including sugar. Occurs in flowers (floral nectary) and on vegetative plant parts (extrafloral nectary). definition_reference: ISBN:047124529 term: nectary epidermis goid: TAIR:1111207 definition: the epidermal layer of the nectary. definition_reference: TAIR:lr term: nectary parenchyma goid: TAIR:1111309 definition: the ground tissue of the nectary. definition_reference: TAIR:lr term: node goid: TAIR:1111344 definition: the part of the stem at which one or more leaves are attached;not sharply delimited anatomically. definition_reference: ISBN:0471245208 term: nucellus goid: TAIR:1111240 definition: Inner part of an ovule in which the embryo sac develops. Commonly considered to be equivalent to the megasporangium. definition_reference: ISBN:047125208 term: ovary goid: TAIR:1111128 definition: Lower part of a carpel (simple pistil) or of a gynoecium composed of united carpels (compound pistil) containing the ovules and differentiating into the fruit. definition_reference: ISBN:047124529 term: ovary ground tissue goid: TAIR:1111163 definition: the ground tissue layer of the ovary. definition_reference: TAIR:lr term: ovary inner epidermis goid: TAIR:1111137 definition: inner epidermal layer of the ovary wall. definition_reference: TAIR:lr term: ovary outer epidermis goid: TAIR:1111139 definition: outer epidermal layer of the ovary wall. definition_reference: TAIR:lr term: ovary parenchyma goid: TAIR:1111242 definition: parenchyma layer of the ovary wall. definition_reference: TAIR:lr term: ovary vascular system goid: TAIR:1111129 definition: vascular system of the ovary definition_reference: TAIR:lr term: ovule goid: TAIR:1111236 definition: A structure in seed plants enclosing the female gametophyte and composed of the nucellus, one or two integuments, and funiculus; differentiates into the seed. definition_reference: ISBN:047124529 term: palisade parenchyma goid: TAIR:1111342 definition: Leaf mesophyll parenchyma characterized by elongated form of cells and their arrangement with their long axes perpendicular to the surface of the leaf. definition_reference: ISBN:047124529 term: passage cell goid: TAIR:1111353 definition: Cell in exodermis or endodermis that remains thin walled when the associated cells develop thick secondary walls. Has casparian strip in endodermis. definition_reference: ISBN:047124529 term: pavement cell goid: TAIR:1111332 definition: epidermal cells with a characteristic convoluted anticlinal cell walls that give a jigsaw like appearance to the lamina. definition_reference: ISBN:087694289 term: pedicel goid: TAIR:1111220 definition: The stalk of an individual flower. definition_reference: ISBN:047124529 term: pericarp goid: TAIR:1111347 definition: Fruit wall developed from the ovary wall. definition_reference: ISBN:047124529 term: pericycle goid: TAIR:1111260 definition: Part of ground tissue of the stele located between the phloem and the endodermis. In seed plants, regularly present in roots, absent in most stems. definition_reference: ISBN:047124529 term: peripheral zone goid: TAIR:1111225 definition: organogenic region of the meristem. characterized by higher rates of cell division. definition_reference: TAIR:lr definition_reference: ISBN:0521288959 term: petal goid: TAIR:1111124 definition: A unit of the corolla of a flower. definition_reference: ISBN:047124529 term: petal parenchyma goid: TAIR:1111234 definition: the ground tissue of the petal. definition_reference: TAIR:lr term: petiole goid: TAIR:1111121 definition: the stalk of a leaf. definition_reference: ISBN:0471245208 term: phloem goid: TAIR:1111278 definition: The principal food-conducting tissue of the vascular plant composed mainly of sieve elements, various kinds of parenchyma cells, fibers, and sclereids. definition_reference: ISBN:047125208 term: phloem initial goid: TAIR:1111400 definition: A cambial cell on the phloem side of the cambial zone that is the source of one or more cells arising by periclinal divisions and differentiating into phloem elements with or without additional divisions in various planes. Sometimes called phloem mother cell. definition_reference: ISBN:0471245208 term: phloem parenchyma goid: TAIR:1111359 definition: parenchyma tissue found in the phloem. definition_reference: TAIR:lr term: polar nucleus goid: TAIR:1111196 definition: One of two nuclei in the central cell of a mature embryo sac. The two nuclei are derived from groups of nuclei at the two opposite poles of the eight-nucleate embryo sac. definition_reference: ISBN:047125208 term: pollen sac goid: TAIR:1111156 definition: Sporangium in which microspores are formed; anther locule and its walls in angiosperms. definition_reference: ISBN:047125208 term: primary endosperm nucleus goid: TAIR:1111195 definition: Nucleus resulting from the fusion of the male gamete and two polar nuclei in the central cell of the embryo sac. definition_reference: ISBN:0471245208 term: primary phloem goid: TAIR:1111280 definition: Phloem tissue differentiating from procambium during primary growth and differentiation of a vascular plant. Commonly divided into the earlier protophloem and the later metaphloem. Not differentiated into axial and ray systems. definition_reference: ISBN:047125208 term: procambium goid: TAIR:1111345 definition: Primary meristem or meristematic tissue which differentiates into the primary vascular tissue. Also called provascular tissue. definition_reference: ISBN:047125208 term: protoderm goid: TAIR:1111182 definition: Primary meristem or meristematic tissue giving rise to the epidermis; also epidermis in meristematic state. May or may not arise from independent initials in the apical meristem. definition_reference: ISBN:047124529 term: protophloem goid: TAIR:1111346 definition: the first-formed elements of the phloem in a plant organ. First part of the primary phloem. definition_reference: ISBN:0471245208 term: protoxylem goid: TAIR:1111272 definition: The first formed elements of the xylem in a plant organ. First part of the primary xylem. definition_reference: ISBN:047125208 term: quiescent center goid: TAIR:1111259 definition: The initial region in the apical meristem that has reached a state of relative inactivity; common in roots. definition_reference: ISBN:047124529 term: radicle goid: TAIR:1111268 definition: the embryonic root. Forms the basal continuation of the hypocotyl in an embryo. definition_reference: ISBN:047124529 term: raphe goid: TAIR:1111364 definition: A ridge along the body of the seed formed by the part of the funiculus that is adnate to the ovule (in an anatropous ovule). definition_reference: ISBN:047124529 term: replum goid: TAIR:1111135 definition: in an ovary or fruit, a false septum formed bu ingrowth from the placenta rather than from the carpel walls. definition_reference: ISBN:0140514031 term: reproductive goid: TAIR:1111306 definition: stages of development that between flowering and death of the plant. definition_reference: TAIR:lr term: rib zone goid: TAIR:1111226 definition: region of the meristem that lies below the central zone and within the peripheral zone definition_reference: ISBN:0521288959 definition_reference: TAIR:lr term: root cap goid: TAIR:1111253 definition: A thimblelike mass of cells covering the apical meristem of the root. definition_reference: ISBN:047125208 term: root cortex goid: TAIR:1111258 definition: the primary tissue located between the vascular system and the epidermis. definition_reference: ISBN:047125208 term: root epidermis goid: TAIR:1111361 definition: epidermal layer of the root definition_reference: ISBN:047124529 term: root hair goid: TAIR:1111256 definition: A type of trichome on root epidermis that is a simple extension of an epidermal cell and is concerned with absorption of soil solution. definition_reference: ISBN:0471245208 term: sclerenchyma goid: TAIR:1111300 definition: Cell variable in form and size, being more or less thick, often lignified, secondary walls. Belongs to the category of subcells and may or may not be devoid of protoplast at maturity. definition_reference: ISBN:047124529 term: seed coat epidermis goid: TAIR:1111371 definition: the epidermal layer found on the outer surface of an organ definition_reference: TAIR:lr term: sepal goid: TAIR:1111125 definition: A unit of the calyx. definition_reference: ISBN:047124529 term: sepal epidermis goid: TAIR:1111176 definition: the epidermal layer of the sepal. definition_reference: TAIR:lr term: septum goid: TAIR:1111131 definition: any partition, whether within a cell, as in a septate fibre, or in an organ such as a fruit. definition_reference: ISBN:0140514031 term: sieve cell goid: TAIR:1111285 definition: A type of sieve element that has relatively undifferentiated sieve areas (with narrow pores), rather uniform in structure on all walls; that is, there are no sieve plates. Typical of gymnosperms and lower vascular plants. definition_reference: ISBN:047124529 term: sieve element goid: TAIR:1111286 definition: The cell in the phloem tissue concerned with mainly longitudinal conduction of food materials. Classified into sieve cell and sieve tube member. definition_reference: ISBN:0471245208 term: sieve plate goid: TAIR:1111287 definition: The part of the wall of a sieve element bearing one or more highly differentiated sieve areas. Typical of angiosperms. definition_reference: ISBN:0471245208 term: sieve tube member goid: TAIR:1111289 definition: One of the series of cellular components of a sieve tube. It shows a more or less pronounced differentiation between sieve plates (wide pores) and lateral sieve areas (narrow pores). Also sieve tube element and the obsolete sieve tube segment. definition_reference: ISBN:047124529 term: silique goid: TAIR:1111208 definition: a dry dehiscent fruit common in Brassicas. definition_reference: ISBN:0140514031 term: specialization zone goid: TAIR:1111348 definition: the portion of the root located behind the elongation zone containing cells that are differentiating into their final form and function. definition_reference: ISBN:0879694289 term: spongy parenchyma goid: TAIR:1111143 definition: Leaf mesophyll parenchyma with conspicuous intercellular spaces. definition_reference: ISBN:047124529 term: stage 1 flower goid: TAIR:1111375 definition: stage of flower development marked by the emergence of the floral meristem on the flank of the inflorescene meristem. definition_reference: ISBN:0387940898 term: stage 10 flower goid: TAIR:1111384 definition: stage of flower development that begins when the petal height is level with the stamens. definition_reference: ISBN:0387940898 term: stage 11 flower goid: TAIR:1111385 definition: stage of flower development that begins when the stigmatic papillae appear. definition_reference: ISBN:0387940898 term: stage 12 flower goid: TAIR:1111386 definition: stage of flower development that begins when the petals are level with the long stamens. definition_reference: ISBN:0387940898 term: stage 13 flower goid: TAIR:1111388 definition: stage of flower development that begins when the floral bud opens and the petals are visible to the naked eye. definition_reference: ISBN:0387940898 term: stage 14 flower goid: TAIR:1111389 definition: Stage of floral development when long anthers extend above the stigma. definition_reference: ISBN:0387940898 term: stage 15 flower goid: TAIR:1111390 definition: Stage of floral developement that begins when the stigma extends above the long anthers. definition_reference: ISBN:0387940898 term: stage 16 flower goid: TAIR:1111391 definition: Stage of floral development that begins when the petals and sepals begin to wither. definition_reference: ISBN:0387940898 term: stage 17 flower goid: TAIR:1111392 definition: Stage of floral development that begins when all of the floral organs have abscised and only the green silique remains. definition_reference: ISBN:0387940898 term: stage 18 flower goid: TAIR:1111422 definition: Stage of floral development that begins when the silique color changes from green to yellow. definition_reference: ISBN:0387940898 term: stage 2 flower goid: TAIR:1111376 definition: Stage of floral development that begins when the floral meristem becomes demarcated from the inflorescence meristem by a slight indentation. definition_reference: ISBN:0387940898 term: stage 3 flower goid: TAIR:1111377 definition: Stage of floral development that begins when the sepal primordia arise. definition_reference: ISBN:038794898 term: stage 4 flower goid: TAIR:1111378 definition: Stage of floral development that begins when the developing sepals overlie the floral meristem. definition_reference: ISBN:0387940898 term: stage 5 flower goid: TAIR:1111379 definition: Stage of floral development that begins when the petal and stamen primordia arise. definition_reference: ISBN:038790898 term: stage 6 flower goid: TAIR:1111380 definition: Stage of floral development that begins when the sepals enclose the floral bud. definition_reference: ISBN:0387940898 term: stage 7 flower goid: TAIR:1111381 definition: Stage of floral development that begins when the ling stamen primordia are stalked at the base. definition_reference: ISBN:0387940898 term: stage 8 flower goid: TAIR:1111382 definition: Stage of floral development that begins when thelocules appear on the long stamens. definition_reference: ISBN:0387940898 term: stage 9 flower goid: TAIR:1111383 definition: Stage of floral development that begins when the petal primordia are stalked at the base. definition_reference: ISBN:0387940898 term: stamen goid: TAIR:1111152 definition: Floral organ producing the pollen and usually composed of anther and filament. The stamens together constitute the androecium. definition_reference: ISBN:047124529 term: stele goid: TAIR:1111314 definition: a morphologic unit of the plant body comprising the vascular system and associated ground tissue (e.g. pericycle, interfasicular regions and pith). definition_reference: ISBN:0471245208 term: stem epidermis goid: TAIR:1111112 definition: epidermal layer of the stem definition_reference: TAIR:lr term: stigma goid: TAIR:1111132 definition: The region of the carpel, in many taxa at the apex of the style, that serves as a surface upon which the pollen germinates. definition_reference: ISBN:047124529 term: stigma epidermis goid: TAIR:1111164 definition: epidermal layer of the stigma. definition_reference: TAIR:lr term: stigmatic papillae goid: TAIR:1111141 definition: ). A soft protuberance on an epidermal cell of the stigma. definition_reference: ISBN:047124529 term: stipule goid: TAIR:1111215 definition: small appendages formed at the base of a leaf. definition_reference: ISBN:0716719460 term: stomatal complex goid: TAIR:1111281 definition: An opening in the epidermis of leaves and stems bordered by two guard cells and serving in gas exchange. definition_reference: ISBN:047124529 term: stomium goid: TAIR:1111157 definition: A fissure or pore in the anther lobe through which the pollen is released. Its formation is a type of dehiscence. definition_reference: ISBN:0471245208 term: style goid: TAIR:1111133 definition: Extension of the top of the ovary, usually columnar, through which the pollen tube grows. definition_reference: ISBN:047124529 term: style epidermis goid: TAIR:1111165 definition: epidermal layer of the style. definition_reference: TAIR:lr term: style parenchyma goid: TAIR:1111307 definition: parenchyma tissues of the style. definition_reference: TAIR:lr term: subsidiary cell goid: TAIR:1111284 definition: an epidermal cell associated with a stoma and at least morphologically distinguishable from the epidermal cells composing the groundmass of the tissue. definition_reference: ISBN:047124520 term: suspensor goid: TAIR:1111175 definition: An extension at the base of the embryo that anchors the embryo in the embryo sac and pushes it into the endosperm. definition_reference: ISBN:047124529 term: synergid goid: TAIR:1111191 definition: cells in the micropylar end of the embryo sac associated with the egg in the egg apparatus of angiosperms. Play a vital role in fertilization. definition_reference: ISBN:047125208 term: tapetum goid: TAIR:1111159 definition: In anther, a layer of cells lining the locule and absorbed as the pollen grains mature. definition_reference: ISBN:047125208 term: tissues and tissue systems goid: TAIR:1111140 definition: Tussues are a group of cells organized into a structural and functional unit. Component cells may be alike (simple tissue) or varied (complex tissue). Tissue systems are tissue or tissues in a plant or plant organ structurally and functionally organized into a unit. Commonly three tissue systems are recognized, dermal, vascular, and fundamental (ground tissue system). definition_reference: ISBN:0471245208 term: torpedo stage goid: TAIR:1111187 definition: During this stage the embryo elongates into the cellular endosperm and the internal layers of the hypocotyl and radicle differentiate to form the vascular tissue. Lipid deposition into the cotyledons begins at this stage. Organelle differentiation occurs leading to greening of the embryo. definition_reference: ISBN:0387940898 term: tracheary element goid: TAIR:1111290 definition: general term for a water conducting cell, tracheid or vessel member. definition_reference: ISBN:047124529 term: tracheid goid: TAIR:1111301 definition: A tracheary element of the xlyem that has no perforations, as contrasted with a vessel member. May occur in primary and in secondary xylem. May have any kind of secondary wall thickening found in tracheary elements. definition_reference: ISBN:047124529 term: transmitting tract goid: TAIR:1111134 definition: The tissue in the style of a flower through which the pollen tube grows between the stigma and the ovarian cavity. Also called pollen conducting tissue. definition_reference: ISBN:047124529 term: trichoblast goid: TAIR:1111262 definition: Commonly used for a cell in root epidermis that gives rise to a root hair. The daughter cell produced by the asymmetric division of a root epidermal cell that gives rise to a root hair. definition_reference: ISBN:047124529 term: trichome goid: TAIR:1111282 definition: An outgrowth from the epidermis. Trichomes vary in size and complexity and include hairs, scales, and other structures and may be glandular. definition_reference: ISBN:047124529 term: two-celled stage goid: TAIR:1111177 definition: The embryo after the first mitotic division that produces a smaller apical cell and larger basal cell. The basal cell gives rise to the radicle and the suspensor. The apical cell gives rise all of the embryo except the root. definition_reference: ISBN:0387940898 term: upper tier goid: TAIR:1111354 definition: In an eight celled embryo, the upper four cells formed by mitotic division of the apical cell. These cells will give rise to the apical meristem and cotyledons. definition_reference: ISBN:089694269 term: vascular bundle goid: TAIR:1111362 definition: A strandlike part of the vascular system composed of xylem and phloem. definition_reference: ISBN:047124529 term: vascular cambium goid: TAIR:1111356 definition: Lateral meristem that forms the secondary vascular tissues, secondary phloem and secondary xylem, in stem and root. I located between those two tissues and, by periclinal divisions, gives off cells toward both tissues. definition_reference: ISBN:047125208 term: vascular system goid: TAIR:1111270 definition: The total of the vascular tissues in their specific arrangement in a plant or plant organ. definition_reference: ISBN:047125208 term: vascular tissue goid: TAIR:1111327 definition: A general term referring to either or both vascular tissues, xylem and phloem. definition_reference: ISBN:047125208 term: vegetative goid: TAIR:1111305 definition: stages of development that occur from seed germination up to flowering definition_reference: TAIR:lr term: vegetative cell goid: TAIR:1111169 definition: Cell type formed after the first mitotic division of the microgametophye, The nucleus of this cell migrates to the tip of the pollen tube after germination and desintigrates when the pollen tube penetrates the nucellus. definition_reference: TAIR:lr definition_reference: ISBN:0140514031 term: visible flower buds goid: TAIR:1111420 definition: Whole plant developmental stage at which the first flower buds become visible to the naked eye definition_reference: PMID:11449047 term: xylem goid: TAIR:1111271 definition: The principal water-conducting tissue in vascular plants characterized by the presence of tracheary elements. The xylem may also serve as a supporting tissue, especially the secondary xylem (wood). definition_reference: ISBN:047125208 term: xylem element goid: TAIR:1111273 definition: Cells composing the xylem definition_reference: ISBN:047124529 term: xylem fiber cell goid: TAIR:1111274 definition: A fiber of the xylem tissue, Two types are recognized, int he secondary xylem,fiber tracheids and libriform fibers. definition_reference: ISBN:047124529 term: xylem initial goid: TAIR:1111275 definition: A cambial cell on the xylem side of the cambial zone that is the source of one or more cells arising by periclinal divisions and differentiating into xylem elements either with or without additional divisions in various planes. Sometimes called xylem mother cell. definition_reference: ISBN:047125208 term: xylem intitial goid: TAIR:1111357 definition: A cambial cell on the xylem side of the cambial zone that is the source of one or more cells arising by periclinal divisions and differentiating into xylem elements either with or without additional divisions in various planes. definition_reference: ISBN:047124529 term: xylem parenchyma goid: TAIR:1111358 definition: parenchyma tissue of the xylem definition_reference: TAIR:lr term: zygote goid: TAIR:1111423 definition: The product of fusion of two gametes before mitosis or meiosis. definition_reference: ISBN:0140514031