planteome-user
commented
10 years ago We currently have the existing term:
name: specific leaf area (TO:0000562) -is_a: TO:0000540 ! leaf area - lacks any definition
Proposed definition: "A leaf area (TO:0000540) trait that is the ratio of the leaf area (TO:0000540) to the leaf dry weight (TO:0001014)." Or "A leaf area trait (TO:0000540) that is the ratio of the leaf area (TO:0000540) to the leaf dry mass (TO:New)."
Or we could include both: "A leaf area trait (TO:0000540) that is the ratio of the leaf area (TO:0000540) to the leaf dry weight (TO:0001014) or leaf dry mass (TO:New)."
A quick review of the literature shows that SLA is defined using both weight and mass.
For example: SLA at MaizeGDB
We also have the following terms for aspects of leaf weight.
leaf weight (TO:0000505) def: "A leaf anatomy and morphology trait (TO:0000505) which is associated with the measure of leaf weight."
leaf wet weight id: TO:0000891 def: "A leaf weight trait (TO:0000505) which is associated with the measure of the wet weight of a leaf (PO:0025034)." [PO:0025034, TO:moorel]
leaf dry weight id: TO:0001014 def: "A leaf weight trait (TO:0000505) which is associated with the measure of the dry weight of a leaf (PO:0025034)." [GR:pj, PO:0025034, TO:moorel]
Note that weight and mass are not identical, and are defined differently in PATO:
mass PATO:0000125: A physical quality that inheres in a bearer by virtue of the proportion of the bearer's amount of matter.
weight PATO:0000128 A physical quality inhering in a bearer that has mass near a gravitational body.
Original comment by: cooperl09
Specific leaf area
definition: leaf area measured in ratio to leaf dry mass.
synonym: leaf specific area
might need addition of 'leaf dry mass' as new trait.
Reported by: jaiswalp
Original Ticket: obo/plant-trait-ontology-to-requests/271