plants in GO

[Pankaj Jaiswal]

Just a had quick look and here are the suggestion

development sexual reproduction needs rephrasing or we don't need this 
term. Sexual reproduction is good enough. About the regulation terms, do 
we really need them at this time. My suggestion is that first we should 
organize the top level structure and then look for adding regulation terms.


female gamete generation (sensu Magnoliophyta)
	I am not sure if this is the statement in definition 'as in, but not 
restricted to, the flowering plants (Magnoliophyta, 
ncbi_taxonomy_id:3398)." makes sense". In the term we are using sensu 
and in definition we are saying not restricted to...?
Also I would consider it as the same as megagametogenesis.

We should list the following at same level because they are more or less 
governed by the temporal nature of the processes and often one process 
precedes/overlaps the other. So first it is the ovule that 
develops-->megaspores-->embryosac(female gametophyte/megagametohyte)

Sexual reproduction
-i-sexual reproduction (sensu Magnoliophyta)
--i--female reproductive organ development  (sensu Magnoliophyta)
---p--ovule development
---p--megagametophyte development
------p--megagametogenesis
------p--megasporogenesis
------p-- megagametophyte maturation


for ovule development I would restrict it to  the inclusion and 
development of the
p-antiraphe
p-chalaza
p-integument
p-micropyle
p-nucellus
      p-megasporocyte
p-raphe

Since megaspore develops from megasporocyte, then the process enters 
megasporogenesis
Megasporogenesis
-p-- megasporocyte differentiation
-p-- megasporocyte meiosis
---p--megasporocyte meiosis-division 1
---p--megasporocyte meiosis-division 2
---p--megaspore maturation, syn: functional megaspore formation  (this 
also includes degeneration of other 3 megaspores depending on teh type 
of embryosac)

Then comes the megagametogenesis

megagametogenesis
-p--megaspore mitotic division 1
-p--megaspore mitotic division 2
-p--megaspore mitotic division 3

Followed by (the instances are not ordered in temporal way)
  megagametophyte maturation
--p--cellularization of megagametophyte
--p--differentiation of the antipodal cell
--p--egg apparatus differentiation
--p--female gametophyte central cell differentiation
--p--megagametophyte nuclear migration
--p--synergid cell differentiation

I am not sure about megagametophyte nuclear division, the definition 
appears to have some parts from microspore dev.


All these suggestion are based on the most popular monosporic 8-nucleate 
polygonum type and could change based on the type of embryosac.

Some ref
http://www.unizh.ch/botinst/Cyto_Website/schneitzLab/OvuleDevelopment/outlook.html
http://www.pubmedcentral.nih.gov/articlerender.fcgi?artid=161260&rendertype=abstract
http://www.pubmedcentral.nih.gov/picrender.fcgi?artid=160483&action=stream&blobtype=pdf

J Clark wrote:

> Hi,
> 
> Is anybody in the plant ontology community able to comment on the terms 
> I've made up to cover plant gametophyte development in the gene 
> ontology? I'd really appreciate any feedback that people could give me. 
> Feedback sent as a reply to this e-mail would be excellent if people do 
> not have a sourceforge username.
> 
> [ 1003916 ] female gametophyte development
> https://sourceforge.net/tracker/index.php?func=detail&aid=1003916&group_id=36855&atid=440764 
> 
> 
> Thanks,
> 
> Jen
> 
> 
> 

-- 
************************
Pankaj Jaiswal, PhD
G15-Bradfield Hall
Dept. of Plant Breeding
Cornell University
Ithaca, NY-14853, USA

Tel: +1-607-255-3103
      +1-607-255-4109
Fax: +1-607-255-6683
http://www.gramene.org
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