#10138 unicellular trichome apex and tip

[Laurel Cooper]

The Plant Ontology would like to request two terms to describe the apical most parts of a unicellular trichome.

New: unicellular trichome apex (GO:xxxxx): A cell projection part that is the apical most portion of a unicellular trichome (PO:0025537)

New: unicellular trichome tip (GO:xxxxx): A cell projection part that is the apical most portion of a unicellular trichome apex (GO:xxxxx)

We just added a new term to describe the unicellular trichome (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).

you can see it here:
http://dev.plantontology.org/amigo/go.cgi?view=details&search_constraint=terms&depth=0&query=PO:0025537&session_id=4679b1366669062

[Paola Roncaglia]

Hi Tanya,

Could you or Donghui take care of this request please? If not, just assign it to me.

Thanks,
Paola

[Tanya Berardini]

Hi Laurel,

I want to check whether you want the new terms to be part_of unicellular trichome branch as well as is_a cell projection part. The part_of relationship makes sense to me.

Thanks,

Tanya

[Laurel Cooper]

The unicellular trichome apex/tip will not always be part of the unicellular trichome branch, but sometimes will be part of an unbranched unicellular trichome.

but, it would be true that:
- the unicellular trichome branch has_part unicellular trichome apex
- unicellular trichome branch has_part unicellular trichome tip

Let me know what you think....L

[Tanya Berardini]

Aha. I get the has_part. One more question: It sounds like the tip is part_of the apex. Is that right?

cell projection part (GO:exists)
--[i] unicellular trichome apex (GO:new1)
---[p] unicellular trichome tip (GO:new2)
--[i] unicellular trichome tip (GO:new2)

[Laurel Cooper]

Yes the apex (as defined by the PO) is the larger portion of the apical region, with the tip being the very end. Thanks

[Tanya Berardini]

Added:

[Term]
+id: GO:0090552
+name: unicellular trichome apex
+namespace: cellular_component
+def: "A cell projection part that is the apical most portion of a unicellular trichome." [GOC:PO_curators, PO:0025537]
+is_a: GO:0044463 ! cell projection part

+
+[Term]
+id: GO:0090553
+name: unicellular trichome tip
+namespace: cellular_component
+def: "A cell projection part that is the apical most portion of a unicellular trichome apex." [GOC:PO_curators]
+is_a: GO:0044463 ! cell projection part
+relationship: part_of GO:0090552 ! unicellular trichome apex