Details of Changes to Release 20

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Includes all revisions from 1761 and on.

New terms:

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.

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• 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 )

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).

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• 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).

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).

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.

Obsolete terms

paraclade was merged into primary inflorescence branch

Other

• Error in the header: in current version (r1916) and line 26, the tag is misspelled. You currently have a tag called treat-xrefs-as-genus-differntia in the header. The correct spelling is treat-xrefs-as-genus-differentia (Note the additional 'e' in differentia). Judging from the SVN logs, this error has been there for more than one year. inferences may be slightly incomplete or otherwise affected. Once fixed,should check your inferences, just to be sure.

Fixed