early wood and late wood

[planteome-user]

early wood (PO:0004515):

Current def.: The wood formed in first part of a growth ring and characterized by a lower density and larger cells than the late wood.

Proposed def.: A portion of secondary xylem (PO:0005848) that has lower density and larger cells than late wood (PO:0004516) and is formed in the first part of a growing season. The transition from early wood to late wood may be gradual and is not always easy to distinguish.

part_of growth ring

synonym: spring wood

late wood (PO:0004516):

Current def.: The secondary xylem formed in the later part of a growth ring; denser and composed of smaller cells than the early wood.

Proposed def.: A portion of secondary xylem (PO:0005848) that has higher density and smaller cells than early wood (PO:0004515) and is formed in the later part of a growing season. The transition from early wood to late wood may be gradual and is not always easy to distinguish.

part_of growth ring

synonym: summer wood

Reported by: rlwalls2008

Original Ticket: obo/plant-ontology-po-term-requests/451

[planteome-user]

Revised definitions accepted at the POC meeting on 3-13-12:

early wood (PO:0004515): A portion of secondary xylem (PO:0005848) that is a part of a growth ring (PO:0004514) formed during the early part of a growing season, has lower density than late wood (PO:0004516) of the same growth ring, and has as parts early wood tracheary elements (PO:0025461) with generally larger lumens than the late wood tracheary elements (PO:0025462) of the same growth ring.

Comment: The transition from early wood to late wood may be gradual and is not always easy to distinguish.

part_of growth ring

synonyms: earlywood, spring wood

late wood (PO:0004516): A portion of secondary xylem (PO:0005848) that is a part of a growth ring (PO:0004514) formed during the later part of a growing season, has higher density than early wood (PO:0004515) of the same growth ring, and has as parts late wood tracheary elements (PO:0025462) with generally smaller lumens than the early wood tracheary elements (PO:0025461) of the same growth ring.

Comment: The transition from early wood to late wood may be gradual and is not always easy to distinguish.

part_of growth ring

synonym: latewood, summer wood

Original comment by: rlwalls2008

[planteome-user]

Added new terms for cells, as per suggested at the POC meeting on 3-13-12:

early wood tracheary element (PO:0025461): A tracheary element that is part of a portion of early wood (PO:0004515).
Comment: Early wood tracheary elements generally have larger cell lumens than late wood tracheary elements (PO:0025462) of the same growth ring (PO:0004514).
syn: earlywood tracheary element

late wood tracheary element (PO:0025462): A tracheary element that is part of a portion of late wood (PO:0004516).
Comment: Late wood tracheary elements generally have smaller cell lumens than early wood tracheary elements (PO:0025461) of the same growth ring (PO:0004514).
syn: latewood tracheary element

Both of these are set up as cross-products.

Original comment by: rlwalls2008