archesporial cell Need feedback

[Peter Stevens]

>refer to
><http://www.plantontology.org/amigo/go.cgi?action=query=query_id=7037b1149707476=archesporial+cell_constraint=terms>http://www.plantontology.org/amigo/go.cgi?action=query&view=query&session_id=7037b1149707476&query=archesporial+cell&search_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)
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