!version: $Revision: 1.11 $ !date: Fri Jul 08 19:44:07 PDT 2005 !saved-by: katica !autogenerated-by: DAG-Edit version 1.419 rev 3 ! !Gene Ontology definitions ! term: 1 floral meristem visible goid: PO:0006301 definition: Stage of flower development marked by the emergence of the floral meristem on the flank of the inflorescence meristem. definition_reference: POC:curators term: 2 floral meristem notched goid: PO:0006302 definition: Stage of floral development that begins when the floral meristem becomes demarcated from the inflorescence meristem by a slight indentation. definition_reference: POC:curators term: 3 calyx developmental stages goid: PO:0006303 definition: Stages of development of the calyx defined by characteristic morphological, structural, histological or other visible features. definition_reference: POC:curators term: 3 floral organ development stages goid: PO:0006300 definition: Stages of development of floral organs defined by characteristic morphological, structural, histological or other visible features. definition_reference: POC:curators term: 3.1 sepal primordum visible goid: PO:0006307 definition: Stage of calyx development that begins when the sepal primordia arise. definition_reference: POC:curators term: 3.2 sepal differentiation and expansion stage goid: PO:0000044 definition: Stage of calyx development defined by differentiation and expansion of sepal. definition_reference: POC:fz term: 3.3 fully expanded sepal goid: PO:0000045 definition: Stage of calyx development when sepal is fully expanded. definition_reference: POC:fz term: 4 anthesis goid: PO:0006316 definition: The phase of a flower when pollen is presented and/or the stigma is receptive. definition_reference: APWeb:glossary term: 4 corolla developmental stages goid: PO:0006304 definition: Stages of development of the corolla defined by characteristic morphological, structural, histological or other visible features. definition_reference: POC:curators term: 4.1 petal primordum visible goid: PO:0006308 definition: Stage of corolla development that begins when the petal or petal-stamen primordia arise. definition_reference: POC:curators term: 4.2 petal differentiation and expansion stage goid: PO:0006311 definition: Stage of corolla development defined by differentiation and expansion of petal. definition_reference: POC:fz term: 4.3 fully expanded petal goid: PO:0006312 definition: Stage of corolla development when petal is fully expanded. definition_reference: POC:fz term: 5 lemma developmental stages goid: PO:0000047 definition: Stages of development of the lemma defined by characteristic morphological, structural, histological or other visible features. definition_reference: GR:ap definition_reference: POC:fz term: 5 post anthesis goid: PO:0006317 definition: The phase of a flower after the pollen is presented and/or the stigma is receptive. definition_reference: POC:curators term: 5.1 lemma primordia visible goid: PO:0000055 definition: Stage of lemma development that begins when the lemma primordia arise. definition_reference: POC:fz comment: The lemma primordium forms in 1/2 alternate phylotaxy in rice spikelet. term: 5.2 lemma differentiation and expansion stage goid: PO:0000056 definition: Stage of lemma development defined by differentiation and expansion of lemma. definition_reference: POC:fz term: 5.3 fully expanded lemma goid: PO:0000057 definition: Stage of lemma development when lemma is fully expanded. definition_reference: POC:fz term: 6 palea developmental stages goid: PO:0000048 definition: Stages of development of the palea defined by characteristic morphological, structural, histological or other visible features. definition_reference: GR:ap definition_reference: POC:fz term: 6.1 palea primordia visible goid: PO:0000058 definition: Stage of palea development that begins when the palea primordia arise. definition_reference: POC:fz comment: The palea primordium forms in 1/2 alternate phylotaxy in rice spikelet. term: 6.2 palea differentiation and expansion stage goid: PO:0000070 definition: Stage of palea development defined by differentiation and expansion of palea. definition_reference: POC:fz term: 6.3 fully expanded palea goid: PO:0000071 definition: Stage of palea development when palea is fully expanded. definition_reference: POC:fz term: 7 lodicule developmental stages. goid: PO:0000049 definition: Stages of development of the lodicule defined by characteristic morphological, structural, histological or other visible features. definition_reference: GR:ap definition_reference: POC:fz term: 7.1 lodicule primordia visible goid: PO:0000072 definition: Stage of palea development that begins when the palea primordia arise. definition_reference: POC:fz comment: Two lodicules form on the side of the lemma in rice spikelet. term: 7.2 lodicule differentiation and expansion stage goid: PO:0000077 definition: Stage of lodicule development defined by differentiation and expansion of lodicule. definition_reference: POC:fz term: 7.3 fully expanded lodicule goid: PO:0000079 definition: Stage of lodicule development when lodicule is fully expanded. definition_reference: POC:fz term: 8 androecium developmental stages goid: PO:0006305 definition: Stages of development of the androecium defined by characteristic morphological, structural, histological or other visible features. definition_reference: POC:curators term: 8.1 stamen primordum visible goid: PO:0006313 definition: Stage of androecium development that begins when the stamens or petal-stamen primordia arise. definition_reference: POC:curators term: 8.2 anther developmental stages goid: PO:0000004 definition: Stages of development of the anther defined by characteristic morphological, cytological, histological or other visible features. definition_reference: POC:fz term: 8.3 pollen developmental stages goid: PO:0000007 definition: Stages of development of the pollen defined by characteristic morphological, cytological, histological or other visible features. definition_reference: POC:fz term: 9 gynoecium developmental stages goid: PO:0006306 definition: Stages of development of the gynoecium defined by characteristic morphological, structural, histological or other visible features. definition_reference: POC:curators term: 9.1 carpel primordium visible goid: PO:0006318 definition: Stage of gynoecium development that begins when the carpel primordia arise. definition_reference: POC:curators term: 9.2 ovule developmental stages goid: PO:0006319 definition: Stages of development of the ovule defined by characteristic morphological, structural, histological or other visible features. definition_reference: POC:curators term: A archesporial cells visible goid: PO:0000005 definition: An initial stage during which archesporial cells arise in four corners of L2 layer. Change in shape of primordia to more oval. definition_reference: TAIR:ki term: A megaspore mother cell enlarges goid: PO:0006323 definition: The stage of megagametophyte development when the megaspore mother cell enlarges. definition_reference: POC:curators term: A microsporogenous mass stage goid: PO:0000011 definition: An initial stage during which the archesporial cells divide to give rise to primary parietal and sporogenous cells. definition_reference: TAIR:ki term: A primary endosperm cell stage goid: PO:0000096 definition: One cell stage that takes place following the fertilization, produced by the fusion of sperm cell nucleus and one or more polar nuclei. definition_reference: TAIR:ki term: A root primordium formation goid: PO:0007505 definition: The stage at which root primordium originates and develops at specific locations in embryonic and post embryonic roots. definition_reference: GR:ap term: A zygote goid: PO:0000097 definition: One cell stage that results from fertilization. definition_reference: PO:KI term: A1 primary root primordium formation goid: PO:0007506 definition: The stage at which a group of cells or initials that will differentiate into the primary root become organized in the embryo . definition_reference: GR:ap term: A1 root initials formation stage goid: PO:0007535 definition: After the formation of the apical-basal axis in the young embryo, the central and basal portion give rise to the root meristem. definition_reference: GR:ap comment: Endogenously formed embryonic roots are exclusive to Poaceae.\nThis term has been obsoleted to keep the structure simple. term: A2 lateral root primordium formation goid: PO:0007511 definition: This stage at which the transverse divisions in pericycle cells form the initials of the lateral root primordium. definition_reference: GR:ap term: A2 root initials differentiation stage goid: PO:0007512 definition: The root initials differentiate by cell division and cell expansion. definition_reference: GR:ap comment: Crown root stages are based on rice plant. This term has been obsoleted to keep the structure simple. term: A2.1 root intials differntiation of primary roots goid: PO:0007503 definition: The root initials divide repeatedly and add more cells definition_reference: GR:ap comment: This term has been obsoleted to keep the structure simple. term: A2.2 root initials differentiation of lateral roots goid: PO:0007528 definition: Radial expansion followed by subsequent periclinal divisions forms the pericycle-derived tissues. definition_reference: GR:ap comment: This term has been obsoleted to keep the structure simple. term: A2.3 founder cell derivatives of lateral root goid: PO:0007530 definition: Radial expansion followed by subsequent periclinal divisions forms the isodiametric founder cell tissues. definition_reference: GR:ap comment: This term has been obsoleted to keep the structure simple. term: A2.4 root initials differentiation of crown roots goid: PO:0007534 definition: Initial cells of crown root primordium divide anticlinally and periclinally to form epidermis-endodermis initial, vascular-cylinder initial and root cap initial. definition_reference: GR:ap comment: Crown root stages are based on rice plant. This term has been obsoleted to keep the structure simple. term: A3 crown root primordium formation goid: PO:0007504 definition: The stage at which the initial cells of crown root primordium are formed in the innermost ground meristem cells by one or two periclinal divisions. definition_reference: GR:ap comment: Crown root primordia formed endogenously opposite the collateral bundles in maize. term: B chalazal and micropylar domain establishment goid: PO:0000041 definition: The initial stage of endosperm development during which the chalazal and micropilar domains are established. definition_reference: TAIR:ki term: B enlarged microsporocyte stage goid: PO:0000006 definition: Stage during which the microsporocytes become conspicuous. definition_reference: TAIR:ki term: B formation of primary parietal and sporogenous cells goid: PO:0000018 definition: Stage during which the primary parietal and primary sporogenous layers are derived from archesporial cells. definition_reference: TAIR:ki term: B meiosis of MMC goid: PO:0006324 definition: The stage of megagametophyte development when the megaspore mother cell undergoes meiosis. definition_reference: POC:curators term: B proembryo stage goid: PO:0000180 definition: A stage in the early development of the sporophyte between the zygote and the embryo, multicellular, but before the appearance of any organ rudiments definition_reference: TAIR:ki definition_reference: APWeb:glossary term: B root meristem formation goid: PO:0007527 definition: The stage at which the root meristem becomes evident. definition_reference: GR:ap comment: Characteristic differences in meristem organization have been related to taxonomic groups. term: B1 primary root meristem formation goid: PO:0007524 definition: The stage at which the meristem of the primary root becomes evident. definition_reference: GR:ap term: B2 lateral root meristem formation goid: PO:0007539 definition: The stage at which the meristem of the lateral root becomes evident. definition_reference: GR:ap term: B3 crown root meristem formation goid: PO:0007514 definition: The stage at which the meristem of the crown root becomes evident. definition_reference: GR:ap term: C callose wall formation in pollen mother cells goid: PO:0000008 definition: Stage during which diploid pollen mother cells become separated from each other and from tapetum by a callose wall. definition_reference: TAIR:ki term: C establishment of tissue systems goid: PO:0007525 definition: The stage at which distinct tissues become organized. definition_reference: GR:ap term: C four anther lobes formed goid: PO:0000025 definition: Stage during which the four-lobed anther pattern with two developing stomium regions (notch) are formed. definition_reference: TAIR:ki term: C functional specialization of the endosperm goid: PO:0000042 definition: Stage of endosperm development during which the functional specialization of the maturing endosperm occurs. definition_reference: TAIR:ki term: C globular stage goid: PO:0000185 definition: During this stage the embryo proper retains radial symmetry (increasing in diameter), and three main tissue systems are established. definition_reference: TAIR:ki term: C tetrad of megaspores goid: PO:0006325 definition: The product of meiosis of the megaspore mother cell. definition_reference: POC:curators term: C1 root epidermal differentiation goid: PO:0007516 definition: The stage at which the root epidermis becomes evident. definition_reference: GR:ap comment: Root hairs come to full development beyond the region of elongation zone, approximately at the level where the xylem begins to mature. term: C2 root cortex differentiation goid: PO:0007513 definition: The stage at which the root cortex becomes evident. definition_reference: GR:ap comment: Repetitive periclinal divisions and radial enlargement of cells form the cortex layers, the innermost layers become the endodermis with the differentiation of casparian strips. term: C3 root vascular cylinder differentiation goid: PO:0007509 definition: The stage at which the root vascular cylinder becomes evident. definition_reference: GR:ap comment: The first identifiable region in the differentiating vascular cylinder is the pericycle. In the xylem the differentiation of the tracheary elements begins in a centrifugal direction but is completed in the centripetal direction. The first phloem elements mature before the first xylem elements. term: C3.1 metaxylem differentiation of root. goid: PO:0007521 definition: Differentiation begins with the enlargement and vacuolation of the tracheary elements of the metaxylem. definition_reference: GR:ap comment: These stages are based on Arabidopsis plant. This term has been obsoleted to keep the structure simple. term: C3.2 maturation of phloem elements in root. goid: PO:0007537 definition: The first phloem elements matures. definition_reference: GR:ap comment: This term has been obsoleted to keep the structure simple. term: C3.3 maturation of protoxylem elements in root. goid: PO:0007533 definition: The first protoxylem elements next to the pericycle develop secondary walls and mature. definition_reference: GR:ap comment: This term has been obsoleted to keep the structure simple. term: C4 root cap formation goid: PO:0007501 definition: The stage at which the root cap becomes evident. definition_reference: GR:ap comment: The number and origin of root cap initials that form the root cap varies among species. The root cap initials become independent from the more internally located root meristem cells by an increase in the thickness of the cell wall that separates them term: calyx absolute size goid: PO:0020002 definition: The proportion of the absolute size reached by the calyx definition_reference: POC:curators term: calyx relationship goid: PO:0020003 definition: The stages of development of the calyx with respect to the rest of the bud definition_reference: POC:curators term: coleoptilar stage goid: PO:0000094 definition: The coleoptilar primordium, SAM and radicle are formed in the embryo of grasses. definition_reference: TAIR:ki term: crown root emergence goid: PO:0007518 definition: The stage at which the crown root emerges. definition_reference: GR:ap comment: Crown root stages are based on rice plant. term: D heart-shape stage goid: PO:0000043 definition: Stage during which the basic body plan of the embryo is established. definition_reference: TAIR:ki comment: Two major organ systems, embryo axis and cotyledons become evident. term: D locules established goid: PO:0000026 definition: Stage during which the four clearly defined locules are established. All anther cell types present and microspore mother cells appear. definition_reference: TAIR:ki term: D megaspore degeneration goid: PO:0006326 definition: The stage of megagametophyte development when non-functional megaspores degenerate. definition_reference: POC:curators comment: In some plants more than one megaspore contributes to the megametophyte. term: D pollen mother cell meiosis stage goid: PO:0000009 definition: Stage during which pollen mother cells undergo meiosis to form tetrads of microspores. definition_reference: TAIR:ki term: D root elongation goid: PO:0000031 definition: The stage at which root is elongating. definition_reference: POC:cuartors term: dry seed goid: PO:0000040 definition: Stage during which the seed has attained less than 20% of water content, entering into metabolically inactive, dormant or quiescent state. definition_reference: TAIR:ki term: E emerged root elongation goid: PO:0007529 definition: The stage at which the emerged root starts to elongate. definition_reference: GR:ap term: E root hair formation goid: PO:0007519 definition: The stage at which the root hairs becomes evident. definition_reference: GR:ap term: E tapetum degeneration initiated goid: PO:0000032 definition: Stage during which degeneration of the tapetum is initiated, as the deposition on the surface of the microspore primexine proceeds. definition_reference: TAIR:ki comment: Microspores within single locule are at unicellular stage. term: E tetrad stage goid: PO:0000029 definition: Stage immediately following meiosis, during which the tetrads of microspores are still hold together, enclosed by the callose wall. definition_reference: TAIR:ki term: E torpedo stage goid: PO:0000076 definition: Stage during which the further elongation of embryo axis and cotyledons takes place. definition_reference: TAIR:ki comment: This term is specifically used in Arabidopsis term: E two nucleate megagametophyte goid: PO:0006327 definition: The stage of megagametophyte development when there are two nuclei. definition_reference: POC:curators term: embryo developmental stages goid: PO:0006331 definition: Stages of development of the embryo. definition_reference: TAIR:ki term: embryo maturation stage goid: PO:0000081 definition: The stage at which cotyledon(s) and embryo axis further expand, and storage compounds deposition takes place. definition_reference: TAIR:ki term: endosperm developmental stages goid: PO:0006333 definition: Stages of development of the endosperm. definition_reference: TAIR:ki term: F bilocular anther stage goid: PO:0000034 definition: Stage during which anther becomes bilocular, after degeneration and breakage of septum below stomium. definition_reference: TAIR:ki term: F cotyledonary stage goid: PO:0000078 definition: Rapid elongation of embryo axis and cotyledons occur at this stage, and cotyledons begins to flattened. definition_reference: TAIR:ki term: F four nucleate megagametophyte goid: PO:0006328 definition: The stage of megagametophyte development when there are four nuclei. definition_reference: POC:curators term: F microspore release stage goid: PO:0000010 definition: Stage of microgametophyte development during which the callose wall between the tetrads breaks down and haploid microspores are released and lie freely in locules. definition_reference: TAIR:ki term: F1 root hair initiation goid: PO:0007531 definition: The stage at which the roots hairs are initiated. definition_reference: GR:ap term: F2 root hair elongation goid: PO:0007526 definition: The stage at which the root hairs are fully elongated. definition_reference: GR:ap term: flower development stages goid: PO:0006315 definition: Stages of development of a flower defined by characteristic morphological, structural, histological or other visible features. definition_reference: POC:curators term: formation of aleurone and starchy layers goid: PO:0000099 definition: Differentiation of aleurone layer, the outermost endosperm tissue, and the internal starchy tissue. definition_reference: TAIR:ki term: formation of starchy endosperm goid: PO:0000098 definition: Stage of endosperm development during wich the formation of starchy endosperm occurs. definition_reference: TAIR:ki term: fruit development stages goid: PO:0000002 definition: Stages of development of a fruit defined by characteristic morphological, structural, histological or other visible features. definition_reference: POC:curators term: G anther dehiscence goid: PO:0000035 definition: Stage during which the dehiscence of anthers occurs. Anther breaks along stomium and pollen is released. definition_reference: TAIR:ki term: G early unicellular microspore stage goid: PO:0000012 definition: Stage of microgametophyte development during which the microspores round up and small vacuoles appear in their cytoplasm. The microspore walls thicken due to the formation of the exine. definition_reference: TAIR:ki term: G eight nucleate megagametophyte goid: PO:0006329 definition: The stage of megagametophyte development when there are eight nuclei. definition_reference: POC:curators comment: Some plnats do not form an eight nucleate megametophyte. term: H anther senescence goid: PO:0000036 definition: Stage during which the senescence of anther and stamen occurs. Shrinkage of cells and anther structure takes place. definition_reference: TAIR:ki term: H late unicellular microspore stage goid: PO:0000013 definition: Stage of microgametophyte development during which a large vacuole is formed in each microspore causing a rapid increase in size and a displacement of the nucleus to one side. definition_reference: TAIR:ki term: I first mitotic division stage goid: PO:0000014 definition: Stage of microgametophyte development during which the asymmetric, first mitotic division of the microspores occurs producing a large vegetative cell and small generative cell, located near pollen wall. definition_reference: TAIR:ki term: inflorescence development stages goid: PO:0000083 definition: Stages of development of an inflorescence defined by characteristic morphological, structural, histological or other visible features. definition_reference: POC:curators term: inflorescence initiation stage goid: PO:0020004 definition: Stage of inflorescence development marked by the formation of the inflorescence meristem on a vegetative branch. definition_reference: POC:fz term: integument initiation stage goid: PO:0006322 definition: Stage of ovule development that begins when the integument primordia are visible. definition_reference: POC:curators term: J bicellular pollen stage goid: PO:0000059 definition: Stage of microgametophyte development during which the small generative cell moves inward, becoming completely surrounded by the cytoplasm of the vegetative cell. definition_reference: TAIR:ki term: K second mitotic division stage goid: PO:0000015 definition: Stage of microgametophyte development during which the generative cell undergoes mitotic division to form two male gametes, the sperm cells. definition_reference: TAIR:ki comment: In taxa with mature two-celled pollen, the second mitotic division takes place after pollen germination, in germinating pollen tube. term: L mature pollen stage goid: PO:0000016 definition: Stage of microgametophyte development during which the pollen reaches mature stage and desiccates. definition_reference: TAIR:ki comment: Mature pollen stages is reached at three-celled pollen in some angiosperms (maize, rice and Arabidopsis), while in others, the maturepollen has two haploid cells (tobacco, snapdragon). term: L1 leaf initiation goid: PO:0000051 definition: Stage of leaf development that begins when meristematic cells are already determined to form the leaf primordium and ends right before the leaf primordium is visible on the shoot apex. definition_reference: TAIR:tb comment: Cells in the primordium are not yet differentiated. term: L2 leaf expansion goid: PO:0000052 definition: Stage of leaf development which begins when the leaf primordium is visible and finishes when leaf reaches its full size.\n definition_reference: TAIR:ki term: L3 leaf fully expanded goid: PO:0000053 definition: Stage of leaf development when leaf is fully expanded. definition_reference: TAIR:ki term: L4 leaf senescence goid: PO:0000054 definition: The final stage of leaf development when the leaf ceases metabolic activity and senesces. definition_reference: TAIR:tb term: lateral root emergence goid: PO:0007517 definition: The stage at which the lateral root emerges. definition_reference: GR:ap comment: Starch grains can be seen in the root cap after emergence. term: leaf developmental stages goid: PO:0000050 definition: Stages of development of a leaf defined by characteristic morphological, structural, histological or other visible features. definition_reference: TAIR:tb definition_reference: POC:curators term: M germinated pollen stage goid: PO:0000017 definition: The final stage in the life cycle of the male gametophyte. Upon rehydration, mature pollen grain forms a tubular outgrowth, the pollen tube, which carries the male gametes. definition_reference: TAIR:ki term: megagametophyte developmental stages goid: PO:0006321 definition: Stages of development of the megagametophyte. definition_reference: POC:curators comment: Although megaspore and megagametophyte development are normally separate, one spore producing one gametophyte, in some flowering plants a single gametophyte may be produced from two or four spores. term: meristem eloboration goid: PO:0000000 definition: the root meristem gets organized definition_reference: GR:ap comment: This term has been obsoleted to keep the structure simple. term: N second mitotic division stage in germinating pollen goid: PO:0000074 definition: Stage of microgametophyte development during which the generative cell undergoes a mitotic division to form two male gametes, the sperm cells. definition_reference: TAIR:ki term: ovule primordium visible goid: PO:0006320 definition: Stage of ovule development that begins when the ovule primordia arise. definition_reference: POC:curators term: P0 formation of the leaf founder cells goid: PO:0000003 definition: The initial stage of leaf development where cells in the SAM are already determined to form a leaf primordium, but the primordium itself is not distinguishable morphologically. definition_reference: TAIR:ki term: P1 formation of leaf primordium goid: PO:0000019 definition: Stage of leaf development when leaf primordium is formed as a small protrusion on the flank of SAM. definition_reference: TAIR:ki term: P2 hood-shaped primordium goid: PO:0000020 definition: Stage of leaf development when a hood-shaped primordium is formed, partially enclosing P1 and SAM, as in Poaceae. definition_reference: TAIR:ki term: P3 formation of ligule primordium goid: PO:0000021 definition: Stage of leaf development when conical P3 leaf completely encloses SAM, and the ligule primordium is visible, as in Poaceae. definition_reference: TAIR:ki term: P4 rapid elongation of leaf blade goid: PO:0000023 definition: Stage of leaf development during which a rapid elongation of the leaf blade occurs; the elongation of the leaf sheath has not started, as in Poaceae. definition_reference: TAIR:ki term: P5 rapid elongation of leaf sheath goid: PO:0000024 definition: Stage of leaf development during which a rapid elongation of the leaf sheath occurs, as in Poaceae. definition_reference: TAIR:ki term: plant part developmental stages goid: PO:0000022 definition: Stages of development of a part or parts of a plant defined by characteristic morphological, structural, histological or other visible features. definition_reference: TAIR:ki term: radicle emergence goid: PO:0007507 definition: The stage at which the radicle emerges through the coleorhiza. definition_reference: GR:ap term: root development stages goid: PO:0007520 definition: Stages of development of a root defined by characteristic morphological, structural, histological or other visible features. definition_reference: GR:ap comment: At present the stages are described for primary, lateral and crown roots. term: root emergence goid: PO:0007510 definition: The stage at which the fully formed root emerges. definition_reference: GR:ap term: seed development stages goid: PO:0000170 definition: Stages of seed development, from fertilization to the dry or quiescent state. definition_reference: TAIR:ki term: seed maturation stage goid: PO:0006332 definition: Stage during which the seed storage products (storage proteins, lipids and starch) are being accumulated, either in the cotyledons or in the endosperm. Also, LEA proteins are accumulated and subsequentially, desiccation tolerant state is reached at the end of this stage. definition_reference: TAIR:ki term: sepals 100% of final size goid: PO:0006310 definition: 100% of the absolute size of the sepals. definition_reference: POC:curators term: sepals 50% of final size goid: PO:0006309 definition: 50% of the absolute size of the sepals. definition_reference: POC:curators term: sepals enclosing floral bud goid: PO:0000380 definition: Stage of calyx development that begins when the sepals enclose the floral bud. definition_reference: ISBN:0387940898 term: sepals enclosing meristem goid: PO:0000378 definition: Stage of calyx development that begins when the developing sepals overlie the floral meristem. definition_reference: ISBN:0387940898 term: transition stage goid: PO:0000177 definition: Stage during which a switch from radial to bilateral symmetry takes place and a further axis of asymmetry becomes imposed on the embryo. definition_reference: TAIR:ki term: true leaf formation goid: PO:0000095 definition: During this stage, the protrusion of the first leaf primordia takes place in succession in the grass embryo. definition_reference: TAIR:ki