archesporial cell Need feedback

[Pankaj Jaiswal]

Peter,

I am not sure on your suggestions. I need specific instances of 
archesporial cell present in anther and ovule to annotate gene 
expression profiles. Also the microsporocyte and megasporocyte have a 
derivation from (develops from) these specific instances of archesporial 
cell. Not to mention primary parietal cell is also derived from 
archesporial cell. Therefore we cannnot put them as synonyms of the 
microsporocyte and megasporocyte. Please take a look at the text from 
one of the papers I cited at the end of my previous (or this mail).

Pankaj

Peter Stevens wrote:
>> refer to
>> http://www.plantontology.org/amigo/go.cgi?action=query&view=query&session_id=7037b1149707476&query=archesporial+cell&search_constraint=terms 
>> <http://www.plantontology.org/amigo/go.cgi?action=query=query_id=7037b1149707476=archesporial+cell_constraint=terms>
> 
>>
>> Hi
> 
>> Can you suggest the best usage of the name 'archesporial cell' and its
>> definition. I am doing the ontology updates now and will be able to add
>> them this week.
> 
>> It appear that the term 'archesporial cell' is used as a precursor for
>> both the microsporocyte and megasporocyte. Whereas in PO the term
>> 'archesporial cell' appears as a synonym for 'megasporocyte'. THE USE OF
>> THIS SYNONYM IS INAPPRORIATE.
> 
> 
> 
> Well, Esau certainly uses it in this latter sense, so it is a synonym of 
> megasporocyte.  .
> 
>>
>> On the other hand the same term (from synonym as above) is used in
>> describing a developmental stage of the anther development. This is
>> inconsistent with its usage as synonym in anatomy section.
> 
>> -----------------------
> 
>> WE NEED TWO TERMS FOR 'archesporial cell' representing its location in
>> either the ANTHER and OVULE. These will be children of 'cell'
> 
>> SUGGEST new term names??
> 
> 
> 
> I think megasporocyte and microsporocyte will do perfectly well for the 
> cells that undergo meiosis and produce megaspores and microspores.  The 
> latter terms are also clearer than 'archespore".
> 
> P.
> 
>>
>> Delete the synonym from 'megasporocyte'.
> 
>> -----------------------------
> 
>> For further reading
>> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=retrieve&db=pubmed&list_uids=10465788&dopt=Abstract
> 
>> In arabidopsis anther of wild-type flowers, hypodermal cells at the four
>> corners of the anther expand radially and differentiate into
>> archesporial cells at stage 2 of anther development in stage 7 flowers
>> (Fig. 1C; Sanders et al. 1999). Archesporial cells undergo periclinal
>> divisions, giving rise to an inner primary sporogenous cell (PSC) layer
>> and an outer primary parietal cell (PPC) layer at stage 3 anthers (Fig.
>> 1D).
> 
>> In Arabidopsis stage 10-11 flowers, an archesporial cell forms from a
>> single hypodermal cell at the top of the ovule primordium, becoming more
>> prominent than neighboring cells because of its slightly larger size,
>> denser cytoplasm, and more conspicuous nucleus (Fig. 2A). In some
>> flowering plants, the archesporial cell of the ovule undergoes a
>> periclinal division, and subsequently the inner cell differentiates into
>> the megasporocyte. However, in the majority of flowering plants
>> including Arabidopsis, the archesporial cell elongates and polarizes
>> longitudinally, and directly differentiates into the megasporocyte or
>> megaspore mother cell (MMC) with obvious change in cell shape from near
>> rectangular to teardrop (Figs. 2B and 7B, below; Willemse 1981;
>> Grossniklaus and Schneitz 1998)
> 
> 


-- 
Pankaj Jaiswal
G-15, Bradfield Hall
Dept. of Plant Breeding and Genetics
Cornell University
Ithaca, NY-14853, USA

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