prophyll and scale leaf

[planteome-user]

Prophyll (PO:0009042) and scale leaf (PO:0006003) are children of phyllome. Suggest making them children of vascular leaf.

Reported by: rlwalls2008

Original Ticket: obo/plant-ontology-po-term-requests/273

[planteome-user]

We might want to see if the moss people use sacle leaf befor we do that. For prophyll yes go ahead.

Original comment by: dws409

[planteome-user]

From POC meeting on 2-15-11:

We decided it was best to leave prophyll as a phyllome. It is the first leaf on a shoot system in vascular plants, but it may not be a true vascular leaf/may not have fully developed vascular system. Better to leave it with a more general parent.

We decided to leave scale leaf as a phyllome too, because it is not clear whether it is a true leaf or a bract. Definition of scale leaf needs to be redone.

Original comment by: rlwalls2008

[planteome-user]

Current definition of scale leaf: A reduced and more or less non-photosynthetic leaf, often associated with a vegetatively propagating organ such as a rhizome or perennating bud.

Proposed definition: A phyllome that is reduced in size relative to vascular leaves on the same plant and is often associated with a vegetatively propagating organ such as a rhizome or perennating bud.

Comment: May be photosynthetic or non-photosynthetic. Some consider a scale leaf to be a type of vascular leaf (PO:0009025)

Also need to fix definition of bud scale (PO:0020054)

Current definition:A reduced leaf surrounding a dormant bud.

Proposed def: A scale leaf that surrounds a dormant bud.

Original comment by: rlwalls2008

[planteome-user]

Should also add comment to scale leaf: Some species have vascular leaves that are scale-like (such as Juniperus, Calocedrus, Thuja, Chamaecyparis). Annotations for these should go under vascular leaf, not scale leaf.

Add scale-like leaf as a narrow synonym to vascular leaf. See: http://oregonstate.edu/trees/conifer\_genera/false\_cedars.html

Original comment by: rlwalls2008

[planteome-user]

• summary: prophyll and scale leaf --> non-vascular leaf

Original comment by: rlwalls2008

[planteome-user]

From the POC meeting on 2-22-11:

new definition of scale leaf: A phyllome that is reduced in size relative to a vascular leaf on the same plant and is often associated with a perennating or dormant bud or a vegetatively propagating organ such as a rhizome.

Comment: May be photosynthetic or non-photosynthetic. Some species have vascular leaves that are scale-like (such as Juniperus, Thuja, and Chamaecyparis). Annotations for scale-like leaves should go under vascular leaf (PO:0009025), not scale leaf.

Also fixed the definition of bud scale (PO:0020054), child of scale leaf:
Current def'n: A reduced leaf surrounding a dormant bud.
new def'n: A scale leaf that surrounds a dormant or perennating bud.

Original comment by: rlwalls2008

[planteome-user]

• summary: non-vascular leaf --> prophyll and scale leaf

Original comment by: rlwalls2008

[planteome-user]

Also from POC meeting on 2-22-11:

Primary name for PO:0020054 should be bud scale leaf, with bud scale as an exact synonym.

Should also add term for rhizome scale leaf: a scale leaf that grows from a rhizome.

Original comment by: rlwalls2008

[planteome-user]

Slightly revised (genus-differentia) definition for phrophyll: A phyllome that is the first organ or one of the first two organs formed at the base of an axillary shoot, often smaller and/or in a distinctively different position from leaves formed subsequently.
New comment: A prophyll is not classified as a vascular leaf, because it may not have a fully developed vascular system.

Original comment by: rlwalls2008

[planteome-user]

Closing this item.

Original comment by: rlwalls2008

[planteome-user]

We decided below to not make a prophyll a vascular based on the fact that it may not have a fully developed vascular system.

But, we define vascular leaf as " A leaf in a vascular plant", with the comment: "Has vascular tissue"

So I think that either the prophyll should be a vascular leaf, or we need to make the definition of vascular leaf more explicit.

Also, a quick search of prophyll online results in some interesting results- see this description of an unknown species of Philodendron from Missouri Botanical Garden: http://www.exoticrainforest.com/Philodendron%20Limon%20Ecuador.html

They reference an out-of-print source: "In the scientific text The Genera of Araceae (TGOA) the definition of prophyll is: "prophyll--the first leaf of a branch or a sympodial unit; in all Araceae almost always a 2-keeled cataphyll, often confused w/ cataphyll : cataphyll refers to a particular type of morphology (reduced leaf), prophyll refers to the position of the leaf along a branch." Therefore a prophyll is a specialized leaf form (specialized type) of cataphyll with two keels on the abaxial surface (underside).

Proposed new definition (may need to be further revised): A vascular leaf (PO:0009025) that is the first, or one of the first two leaves formed at the base of an axillary shoot, often smaller and/or in a distinctively different position from leaves formed subsequently.

Ref: The Genera of Araceae- Simon J Mayo, Josef Bogner and Peter C Boyce; Royal Botanic Gardens, Kew, ISBN: 1900347229

maybe this is available at the NYBG??

Original comment by: cooperl09

[planteome-user]

reopening for discussion

Original comment by: cooperl09

[planteome-user]

Note that prophyll is a phyllome, not a leaf, because the issue is that is not whether or not it occurs in a vascular plant, but whether or not it is a leaf. Nonetheless, I agree that we should revisit the definition of vascular leaf at some point, using the tracker: https://sourceforge.net/tracker/index.php?func=detail&aid=3028550&group\_id=76834&atid=835555.

Edit: austinmeier- new GitHub tracker is #137

Original comment by: rlwalls2008

[austinmeier]

#137 Vascular and non-vascular leaves tracker. (new github tracker for reference in rlwalls2008 comment above.)