Details of Changes to Release 20

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Includes all revisions from 1761 and on.

Merged or Obsoleted terms

• paraclade (PO:0004720) was merged into primary inflorescence branch (PO:0006321): No direct annotations, but annotation on paraclade cortex: knat 1 from TAIR
• post-anthesis (PO:0007617) was merged into flowering stage (PO:0007616; was anthesis stage) 8 annotations

New PAE 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)

parts of the perianth:

• free sepal (PO:0025587: A sepal (PO:0009031)that is part of a perianth (PO:0009058) that contains fused sepals (PO:0025584) and/or fused petals (PO:0025583), but is separate from the other sepals (PO:0009031) and petals (PO:0009032).

• free petal (PO:0025569): A petal (PO:0009032) that is part of a perianth (PO:0009058) that contains fused sepals (PO:PO:0025584) and/or fused petals (PO:0025583), but is separate from the other sepals (PO:0009031) and petals (PO:0009032).

• epicalyx bract (PO:0025577): A flower bract (PO:0009034) that is part of the epicalyx (PO:0009063)

• fused perianth (PO:0025880): A perianth (PO:0009058) in which one or more of the petals (PO:0009032), sepals (PO:0009031), and/or tepals (PO:0009033) are fused.

• fused corolla (PO:0025581): A corolla (PO:0009059) that is composed of fused petals (PO:0009032).

• fused calyx (PO:0025582): A calyx (PO:0009060) that is composed of fused sepals (PO:0025584).

• fused petal (PO:0025583): A petal (PO:0009032) that is part of a fused corolla (PO:0025581) or a fused perianth (PO:0025580).

• fused sepal (new PO:0025584): A sepal (PO:0009031) that is part of the fused calyx (PO:0025582) or a fused perianth (PO:0025580).

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.

New Plant Structure Development Stage terms:

• collective phyllome structure development stage (PO:0025578): A collective plant organ structure 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 a primary participant a phyllome (PO:0025023).
• flower meristem transition stage (PO:0025588): A flower development stage (PO:0007615) which begins with the transition from a portion of meristem tissue (PO:0009013) to a flower meristem (PO:0000229) and ends with the onset of the floral organ formation stage (PO:0025585).
• floral organ formation stage (PO:0025585): A flower development stage (PO:0007615) which begins with the floral organ meristem development stage (PO:0007601) and ends with the onset of the flowering stage (PO:0025586).
• flowering stage (PO:0025586): A flower development stage (PO:0007615) during which a single flower (PO:0009046) participates in the process of flowering (GO:0010228).

Renamed terms

No substantial change in the meaning of the definition

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

PAE terms

• 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
• central spike of ear inflorescence (PO:0006505); was: central spike of ear
• central spike of tassel inflorescence (PO:0006324); was: central spike of tassel

• primary infructescence branch (PO:0025112); was: second order infructescence axis
• second order infructescence branch (PO:0025113); was: third order infructescence axis
• third order infructescence branch (PO:0025114); was: forth order infructescence axis
• fourth order infructescence branch (PO:0025115); was: fifth order infructescence axis
• fifth order infructescence branch (PO:0025116); was: sixth order infructescence axis
• sixth order infructescence branch (PO:0025252); was: seventh order infructescence axis
• seventh order infructescence branch (PO:0025253); was: eighth order infructescence axis
• eighth order infructescence branch (PO:0025254); was: ninth order infructescence axis
• ninth or higher order infructescence branch (PO:0025255); was: tenth or higher order infructescence axis

PSDS terms

• E anther wall tapetum degeneration initiated stage (PO:0001032); was: E tapetum degeneration initiated stage
• floral organ meristem development stage (PO:0007601); was: 1 flower meristem visable stage
• floral organ primordium development stage (PO:0007602); was: 2 flower meristem notched stage
• floral organ differentiation stage (PO:0007600); was: 3 floral organ development stage

• Flowering stage(PO:0007616); was: anthesis stage; was: 4 anthesis stage
• post anthesis stage (PO:0007617); was: 5 post anthesis stage

GO Requests

• list new terms or changes requested of the GO