planteome-user
commented
11 years ago Current definition: K second mitotic division stage (PO:0001015): Stage of microgametophyte development during which the generative cell undergoes mitotic division to form two male gametes, the sperm cells.
Revised definition: A pollen development stage (PO:0001007) during which the generative cell (PO:0020097) undergoes mitotic division to form two male gametes, the pollen sperm cells (PO:0025121).
Added two new synonyms, as requested:
- tricellular stage (broad)
- tricellular pollen development stage (exact)
The third synonym (pollen at tricellular stage) describes a plant structure at this stage, so it is not appropriate here.
Revised comment: In taxa with mature two-celled pollen (PO:0025281), the second mitotic division takes place after pollen germination (GO:0009846), in germinating pollen tube cell (PO:0025195).
Notes: The whole pollen development stage class requires work, as some of these terms (such as this one) describe processes, rather than stages, but we will add the synonyms for now and do further revisions for the next release.
This term overlaps with: generative cell mitosis (GO:0055047): The process in which the generative cell divides by mitosis to form two haploid cells. These will subsequently differentiate into sperm cells.
Also, generative cell (PO:0020097) is currently under revision in the PO as well: https://sourceforge.net/tracker/index.php?func=detail&aid=3525242&group\_id=76834&atid=835555.
Original comment by: cooperl09
Add a synonyms to PO:0001015 : K second mitotic division stage -tricellular stage -tricellular pollen development stage -pollen at tricellular stage
Reported by: jaiswalp
Original Ticket: obo/plant-ontology-po-term-requests/509