Details of Changes to Release 20

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Includes all revisions from 1761 and on.


New terms:

Various:

  • bundle sheath cell (PO:0025541): A ground tissue cell (PO:0000076) that is part of a bundle sheath (PO:0006023). part_of bundle sheath
  • bundle sheath chlorenchyma cell (PO:0025542): A chlorenchyma cell (PO:0000076) that is part of a bundle sheath (PO:0006023).
  • plant cuticle ridge (PO:0025536): A portion of plant cuticle (PO:000022) that forms a ridge, may be overlayed with epicuticular wax (PO:0025388). Comment: The plant cuticle ridges are mainly cutin (PO:0025385).
  • adventitious shoot axis PO:0025534: A shoot axis (PO:00025029) that develops in an unusual place. develops from a bud (narrow synonym: adventitious bud)
  • collective phyllome structure development stage (PO:0025578): A collective plant organ stucture development stage (PO:0025338) that has as primary participant collective phyllome structure (PO:0025023).
  • phyllome development stage (PO:0025579): A plant organ development stage (PO:0025339) that has aprimary participant a phyllome (PO:0025023).

parts of the perianth:

  • free petal (PO:0025569): .... under revision
  • epicalyx bract (PO:0025577): A flower bract (PO:0009034) that is part of the epicalyx (PO:0009063)

protoxylem terms

  • centarch protoxylem (new PO:0025552): A portion of protoxylem (PO:0000272) tissue in which the maturation of primary xylem of the shoot system progresses centrifugally with the oldest elements (protoxylem) in the center of the axis.
  • mesarch protoxylem (new PO:0025553)- A portion of protoxylem (PO:0000272) tissue in which the maturation of primary xylem (PO:0005849) of the shoot system (PO:0009006) progresses both centripetally and centrifugally from the center. comment: Mesarch protoxylem is found in ferns and cycads stems.
  • exarch protoxylem (PO:0025554): 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 axis. Comment: Typical of roots in seed plants.
  • shoot system exarch protoxylem (PO:0025556): A portion of exarch protoxylem (PO:002554)tissue in which the maturation of primary xylem (PO:0005849) of the shoot system (PO:0009006) progresses centripetally, the oldest elements (protoxylem) are farthest from the center of the axis.
  • root exarch protoxylem (PO:0025555): A portion of exarch protoxylem (PO:002554) tissue in which the maturation of primary xylem (PO:0005849) of the root system (PO:0025025) progresses centripetally, the oldest elements (protoxylem) are farthest from the center of the axis.
  • monarch protoxylem (new PO:0025558)-A portion of root exarch protoxylem (PO:0025555) tissue in which the primary xylem (PO:0005849) of the root system (PO:0025025) has only one protoxylem strand or pole, and differentiation progresses centripedally, with the oldest element (protoxylem) farthest from the center of the axis.
  • diarch protoxylem (new PO:0025559)- A portion of root exarch protoxylem (PO:0025555) tissue in which the primary xylem (PO:0005849) of the root system (PO:0025025) has two protoxylem strands or poles, and differentiation progresses centripetally, with the oldest elements (protoxylem) farthest from the center of the axis.
  • triarch protoxylem (new PO:0025560)- A portion of root exarch protoxylem (PO:0025555) tissue in which the primary xylem (PO:0005849) of the root system (PO:0025025) has three protoxylem strands or poles, and differentiation progresses centripetally, with the oldest elements (protoxylem) farthest from the center of the axis.
  • tertrach protoxylem (new PO:0025561)- A portion of root exarch protoxylem (PO:0025555) tissue in which the primary xylem (PO:0005849) of the root system (PO:0025025) has four protoxylem strands or poles, and differentiation progresses centripetally, with the oldest elements (protoxylem) farthest from the center of the axis.
  • pentarch protoxylem (new PO:0025562)-A portion of root exarch protoxylem (PO:0025555) tissue in which the primary xylem (PO:0005849) of the root system (PO:0025025) has five protoxylem strands or poles, and differentiation progresses centripetally, with the oldest elements (protoxylem) farthest from the center of the axis.
  • polyarch protoxylem (new PO:0025563)- A portion of root exarch protoxylem (PO:0025555) tissue in which the primary xylem (PO:0005849) of the root system (PO:0025025) has more than five protoxylem strands or poles, and differentiation progresses centripetally, with the oldest elements (protoxylem) farthest from the center of the axis.
  • protoxylem tracheary element (PO:0025575): A primary xylem tracheary element (PO:0025444) with predominately annular or helical secondary wall thickening that are the first formed tracheary elements (PO:0000290) at a particular location.
  • metaxylem tracheary element (PO:0025576):A primary xylem tracheary element (PO:0025444) that may have helical, scalariform, reticulate and/or pitted secondary wall thickenings.

plant sap (PO:0025538) terms

  • plant sap (PO:00255380): A portion of plant substance (PO:0025161) that is an aqueous solution that can be transported through the apoplast (GO:0048046) or symplast (GO:0055044). Comment: plant sap should not be confused with latex or resins.
  • xylem sap (PO:0025539): A plant sap (PO:0025538) that is an aqueous solution which may contain mineral elements, nutrients, and plant hormones, and is transported from the root system (PO:0025025) toward the leaves through the tracheary elements (PO:0000290) of the xylem. Comment: Transport of sap in xylem is characterized by movement from the roots toward the leaves.
  • phloem sap (PO:0025539): A plant sap (new PO:0025538) that is an aqueous solution which may contain sugars, mineral elements, and plant hormones, and is transported through the phloem sieve elements (PO:0025406).
  • root system phloem sap (PO:0025567): A phloem sap (PO:0025540) that is located in the root system (PO:0025025).
  • shoot system phloem sap (PO:0025566): A phloem sap (PO:0025540) that is located in the shoot system (PO:0009006).
  • root system xylem sap (PO:0025568): A xylem sap (PO:0025539) that is located in the root system (PO:0025025).
  • shoot system xylem sap PO:0025565 : A xylem sap (PO:0025539) that is located in the shoot system (PO:0009006).

tapetum terms

  • tapetum cell (PO:0025543): A plant cell (PO:0009002) that is part of the tapetum (PO:0025313). exact synonym: tapetal cell. comment: The tapetum is the inner-most layer of a sporangium wall (PO:0025306).
  • microsporangium tapetum cell (PO:0025544): A tapetum cell (PO:0025543) that is part of a microsporangium tapetum (PO:0025314). part_of a microsporangium tapetum; exact synonym: tapetal cell
  • anther wall tapetum cell (PO:0025545): A microsporangium tapetum cell (PO:0025544) that is part of the anther wall tapetum (PO:0009071). part_of the anther wall tapetum; exact synonym: anther wall tapetal cell
  • megasporangium tapetum cell (PO:0025564): A tapetum cell (PO:0025543) that is part of a megasporangium tapetum (PO:0025315).
  • revised name and definition: E 'anther wall' tapetum degeneration initiated stage (PO:0001032): An anther development stage during which degeneration of the anther wall tapetum (PO:0009071) is initiated, as the deposition on the surface of the microspore (PO:0020048) primexine proceeds.

paraclade terms

  • accessory paraclade (PO:0025546): A primary inflorescence branch (PO:0009081) borne in same axil as an existing primary inflorescence branch (PO:0009081).
  • cauline paraclade (PO:0025547): An inflorescence branch (PO:0009081) borne on the elongated first order inflorescence axis (PO:0025104).
  • rosette paraclade (PO:0025548): An inflorescence branch (PO:0009081) borne on the compacted first order inflorescence axis (PO:0025104), forming the rosette.

trichome terms

  • unicellular trichome (new PO:0025537)- A trichome (PO:0000282) that is a single plant cell (PO:0009002). is_a trichome, is_a plant cell. comment: This should not be confused with a trichome cell, which is a plant cell (PO:0009002) that is part of a multicellular trichome (PO:0000282).
  • trichome apex (new PO:0025550): A plant structure (PO:0009011) that is the apical most portion of a trichome (PO:0000282). comment: This term is the parent to the apex of a multicellular trichome (PO:0025162) or a unicellular trichome (PO:0025537), specifically, a multicellular trichome apex (PO:0025551) and an unicellular trichome apex (GO:0090552), which is a GO cellular component term. is_a plant structure, part_of trichome
    • multicellular trichome apex (new PO:0025551): A portion of plant tissue (PO:0009007) that is the apical most portion of a multicellular trichome (PO:0025162). is_a trichome apex, part_of multicellular trichome (PO:0025551). comment: This term describes the apex region of a multicellular trichome (PO:0000282). The apex of a unicellular trichome is a GO cellular component: unicellular trichome apex (GO:0090552).
  • trichome tip (new PO:0025549): A plant structure (PO:0009011) that is the apical most portion of trichome apex (PO:0025550). is_a plant structure, part of trichome apex
    • multicellular trichome tip (PO:0025535): A portion of plant tissue (PO:0009007) that is the apical most portion of a multicellular trichome apex (PO:0025551).comment: This term is the parent to the tip of a multicellular trichome (PO:0025162) or the tip of a unicellular trichome (PO:0025537), specifically, a multicellular trichome tip (PO:0025535) and a unicellular trichome tip (GO:0090553), which is a GO cellular component term.

Renamed terms

No substantial change in the meaning of the definition

Format 'new_name'(PO:ID); was:'old_name'

  • E anther wall tapetum degeneration initiated stage (PO:0001032); was: E tapetum degeneration initiated stage
  • 1-flower meristem visable stage (PO:0007601); was: 1 flower meristem visable stage
  • 2-flower meristem notched stage (PO:0007602); was: 2 flower meristem notched stage
  • floral organ development stage (PO:0007600); was: 3 floral organ development stage
  • 3-anthesis stage (PO:0007616); was: 4 anthesis stage
  • 4-post anthesis stage (PO:0007617); was: 5 post anthesis stage
  • primary inflorescence branch (PO:0006321); was: second order inflorescence axis
  • second order inflorescence branch (PO:0006322); was: third order inflorescence axis
  • third order inflorescence branch (PO:0025105); was: forth order inflorescence axis
  • fourth order inflorescence branch (PO:0025106); was: fifth order inflorescence axis
  • fifth order inflorescence branch (PO:0025107); was: sixth order inflorescence axis
  • sixth order inflorescence branch (PO:0025108); was: seventh order inflorescence axis
  • seventh order inflorescence branch (PO:0025109); was: eighth order inflorescence axis
  • eighth order inflorescence branch (PO:0025110); was: ninth order inflorescence axis
  • ninth or higher order inflorescence branch (PO:0025111); was: tenth or higher order inflorescence axis

GO Requests

  • list new terms or changes requested of the GO

Obsoleted terms

paraclade was merged into primary inflorescence branch

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