embryo sac and embryo sac egg cell

[planteome-user]

As discussed at POC meeting on 6/30/10, made new term embryo sac (PO:0025074): a female gametophyte in angiosperms.

Is_a female gametophyte. Antipodal cell, central cell and egg apparatus are part_of embryo sac (rather than part of female gametophyte).

Reported by: *anonymous

Original Ticket: obo/plant-ontology-po-term-requests/130

[planteome-user]

• assigned_to: nobody --> rwalls

Original comment by: rlwalls2008

[planteome-user]

Egg cell (PO:0020094) was part_of egg apparatus, but this does not allow for eggs that are not in angiosperms. Therefore, changed relation to egg_apparatus has_part egg cell.

Original comment by: rlwalls2008

[planteome-user]

The changes discussed above were approved at the POC meeting on 7-14-10

Original comment by: rlwalls2008

[planteome-user]

• status: open --> open-accepted

Original comment by: rlwalls2008

[planteome-user]

Antipodal cell, central cell and egg apparatus are part_of embryo sac (rather than part of female gametophyte). These are also part of the megagametophyte!!!

Original comment by: dws409

[planteome-user]

These changes have been accepted, and I am closing this item.

Original comment by: rlwalls2008

[planteome-user]

• status: open-accepted --> closed-accepted

Original comment by: rlwalls2008

[planteome-user]

Reopening this item. We have a new proposed definition for embryo sac.

proposed definition of embryo sac (existing term, PO:0025074): A megagametophyte that is contained in an ovule in an ovary.

Comment: Produces an embryo sac egg cell.

develops_from megaspore, only_in_taxon angiosperm

Note: We also have new definitions for mega- and microgametophyte , pollen, and the different types of egg and sperm cells. See separate trackers for those.

Original comment by: rlwalls2008

[planteome-user]

• priority: 5 --> 8
• status: closed-accepted --> open-accepted

Original comment by: rlwalls2008

[planteome-user]

The new definition was accepted at the POC meeting on 3-29-11.

Set tracker to pending. Will close automatically if no one comments on it.

Original comment by: rlwalls2008

[planteome-user]

• priority: 8 --> 5
• status: open-accepted --> pending-accepted

Original comment by: rlwalls2008

[planteome-user]

This Tracker item was closed automatically by the system. It was previously set to a Pending status, and the original submitter did not respond within 14 days (the time period specified by the administrator of this Tracker).

Original comment by: sf-robot

[planteome-user]

• status: pending-accepted --> closed-accepted

Original comment by: sf-robot

[planteome-user]

Based on the accepted definition ("A megagametophyte that is located in an ovule in an ovary. Comment: Produces an embryo sac egg cell."), embryo sac should be part_of ovule. Added that relation.

"Located_in is used when one class located in another is also part of the other class."

Original comment by: rlwalls2008

[planteome-user]

• priority: 5 --> 1
• status: closed-accepted --> open-accepted

Original comment by: rlwalls2008

[planteome-user]

• status: open-accepted --> closed-accepted

Original comment by: rlwalls2008

[planteome-user]

The embryo sac egg cell (PO:0025123) is defined as : "A plant egg cell that is produced by and located in an embryo sac".

In the hierarchy it is: part_of egg apparatus -> part_of embryo sac

Should add the located in relation to the embryo sac.

Original comment by: cooperl09

[planteome-user]

• summary: embryo sac --> embryo sac and embryo sac egg cell
• status: closed-accepted --> open-accepted

Original comment by: cooperl09

[planteome-user]

Agreed. The part-of relation was added as a place holder because we didn't have the located-in relation at the time.

Original comment by: rlwalls2008

[planteome-user]

Actually, the current relation is embryo sac egg cell part_of egg apparatus, and egg apparatus part_of embryo sac. The egg apparatus (and the egg cell) are actually both part of the megagametophyte, that is, the embryo sac, so these relation are okay. The located_in relation is used for embryo sac (a gametophyte) located_in plant ovary ovule (a part of the sporophyte).

No changes needed.

Original comment by: rlwalls2008

[planteome-user]

• status: open-accepted --> closed-accepted

Original comment by: rlwalls2008

[planteome-user]

The current definition says "A plant egg cell that is produced by and located in an embryo sac."

The embryo sac is not really a "sac" in which the egg cell is located. The embryo sac egg cell is located in the ovule, but we already can infer that, because the embryo sac is located in the ovule.

The phrase "produced by an embryo sac" is a bit odd, because the egg cell is part of the embryo sac, not produced by it. It develops as part of the embryo sac development, and we already have the relation "embryo sac develops_from megaspore". Also, we don't have a "produced by" relation in the PO.

I think a more appropriate definition for embryo sac egg cell would be:

A plant egg cell (PO:0020094) that is part of an egg apparatus (PO:0020096) that is part of an embryo sac (PO:0025074).

We don't technically need that last phrase "that is part of an embryo sac (PO:0025074)", but I think it helps to clarify why this is called an embryo sac egg cell and not an egg apparatus egg cell.

Original comment by: rlwalls2008

[planteome-user]

• priority: 1 --> 3
• status: closed-accepted --> open-later

Original comment by: rlwalls2008

[planteome-user]

As per our discussion at the 10-4-12 skype meeting, I updated the definition of embryo sac egg cell: A plant egg cell (PO:0020094) that is part of an egg apparatus (PO:0020096). Comment. The egg apparatus is part of an embryo sac (PO:0025074).

Also updated definition of embryo sac to reflect our new terminology and add ids: A megagametophyte (PO:0025279) that is located in a plant ovary ovule (PO:0025490). Comment: Produces an embryo sac egg cell (PO:0025123).

Original comment by: rlwalls2008

[planteome-user]

• priority: 3 --> 1
• status: open-later --> closed-fixed

Original comment by: rlwalls2008