plant egg cell - Githubissues

planteome-user commented 14 years ago

The existing definition of egg cell (A non-motile cell at the apex of the embryo sac immediately adjacent to the micropyle and associated with the synergid cells) only encompasses angiosperms.

Proposed def.: A gamete produced by a female gametophyte. (def. of gamete: A plant cell that has half the chromosome complement of the sporophyte and is capable of fertilization to create a zygote.)

Reported by: rlwalls2008

Original Ticket: obo/plant-ontology-po-term-requests/140

planteome-user commented 14 years ago

This will not work for homosporous plants.

Original comment by: dws409

planteome-user commented 14 years ago

is it = mega gamete

Original comment by: jaiswalp

planteome-user commented 14 years ago

Yes, it = megagamete.

We could say: A gamete produced by an archegonium, but then that wouldn't work for angiosperms.

Is it okay to say: A gamete produced by an archegonium or female gametophyte?

Maybe add comment: The egg (megagamete) sually larger than the sperm (microgamete).

Original comment by: rlwalls2008

planteome-user commented 14 years ago

We don't actually have the terms archegonium and antheridium yet, but they are on my list of terms to add.

Original comment by: rlwalls2008

planteome-user commented 13 years ago

At the POC meeting on 10-5-2010 we accepted the following definition: A gamete produced by an archegonium or an embryo sac. Comment: The egg (megagamete) is usually larger than the sperm (microgamete). Syn: macrogamete [exact]

Egg cell will be kept as a general term. We will add two new terms: archegonium egg cell and embryo sac egg cell. Only these child terms will have part_of relations to archegonium or embryo sac.

I am closing this item.

Original comment by: rlwalls2008

planteome-user commented 13 years ago

priority: 7 --> 5
status: open --> closed-fixed

Original comment by: rlwalls2008

planteome-user commented 13 years ago

We probably should think about some of the Algae where there is an egg cell that is not retained but is free. It may be motile or non motile but in all of these cases is larger than the cell that fertilizes it, the sperm cell. I bring this up because of the Charophytes and Spirogyra types that are sister to the land plants.

Original comment by: dws409

planteome-user commented 13 years ago

At the POC meetings on 3-22-11 and 3-29-11, we came up with new definitions for embryo sac egg cell and archegonial egg cell.

Proposed definitions: archegonial egg cell (PO:0025122): An egg cell that is produced by and located in an archegonium.

only_in_taxon bryophytes plus pteridophytes plus gymnosperms (or never_in taxon angiosperms), part_of archegonium

embryo sac egg cell (PO:0025123): An egg cell that is produced by and located in an embryo sac.

only_in_taxon angiosperm, part_of egg apparatus

For Gnetum and Weltwischia, should just use parent terms (egg cell or sperm cell).

Original comment by: rlwalls2008

planteome-user commented 13 years ago

priority: 5 --> 8
status: closed-fixed --> open-fixed

Original comment by: rlwalls2008

planteome-user commented 13 years ago

These definitions were accepted at the POC meeting on 3-29-11.

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

Original comment by: rlwalls2008

planteome-user commented 13 years ago

priority: 8 --> 5
status: open-fixed --> pending-fixed

Original comment by: rlwalls2008

planteome-user commented 13 years ago

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 commented 13 years ago

status: pending-fixed --> closed-fixed

Original comment by: sf-robot

planteome-user commented 13 years ago

Suggest to rename egg cell (PO:0020094) to "plant egg cell", to match the name of plant sperm cell.

Original comment by: rlwalls2008

planteome-user commented 13 years ago

priority: 5 --> 1
status: closed-fixed --> open-fixed

Original comment by: rlwalls2008

planteome-user commented 13 years ago

I agree with the name change: plant egg cell: A gamete produced by an archegonium or an embryo sac.

Suggest revised comment (in CAPS) Comment: The PLANT egg CELL (megagamete) is usually larger than the PLANT sperm CELL (microgamete). Syn: macrogamete [exact]

Original comment by: cooperl09

planteome-user commented 13 years ago

summary: egg cell --> plant egg cell

Original comment by: cooperl09

planteome-user commented 13 years ago

status: open-fixed --> closed-fixed

Original comment by: rlwalls2008

planteome-user commented 12 years ago

Added PO:ids to the definition and updated the comment as below.

def'n: A gamete (PO:0025006) produced by an archegonium (PO:0025126) or an embryo sac (PO:0025074).

comment: The plant egg cell (megagamete) is usually larger than the plant sperm cell (PO:0000084; microgamete). Female gametes may be defined as the non-motile gamete, rather than the larger gamete.

Added xref to SF tracker id.

Original comment by: cooperl09

planteome-user commented 12 years ago

I have never heard the terms microgamete and megagamete before now so it seems odd to me. That said, in algae where they use anisogamous to refer to unequal gamete sizes, the larger of the two is by default the egg. So this may be a good appear, micrcogamete and megagamete. I know of no instance where the sperm is larger than the egg in the land plants. The real reference is to megaspore and microspore where size does not matter.

Perhaps, we should also consider the the sister group to the land plants, the Charophytes where there is no true archegonium but rather a sort of pre-archegonium.

Original comment by: dws409

Planteome / plant-ontology

plant egg cell #140