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--></style><title>Re: archesporial cell Need
feedback</title></head><body>
<blockquote type="cite" cite><font size="-1">refer to</font><br>
<a
href="http://www.plantontology.org/amigo/go.cgi?action=query¯=query¯_id=7037b1149707476¯=archesporial+cell¯_constraint=terms"
><font size="-1">http://www.plantontology.org/amigo/go.cgi<span
></span>?action=query&view=query&session_id=7037b<span
></span>1149707476&query=archesporial+cell&search<span
></span>_constraint=terms</font></a><br>
</blockquote>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font size="-1">Hi</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">Can you suggest the best
usage of the name 'archesporial cell' and its</font><br>
<font size="-1">definition. I am doing the ontology updates now and
will be able to add</font><br>
<font size="-1">them this week.</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">It appear that the term
'archesporial cell' is used as a precursor for</font><br>
<font size="-1">both the microsporocyte and megasporocyte. Whereas in
PO the term</font><br>
<font size="-1">'archesporial cell' appears as a synonym for
'megasporocyte'. THE USE OF</font><br>
<font size="-1">THIS SYNONYM IS INAPPRORIATE.</font></blockquote>
<div><br>
<br>
</div>
<div>Well, Esau certainly uses it in this latter sense, so it is a
synonym of megasporocyte. .</div>
<div><br></div>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font size="-1">On the other hand the
same term (from synonym as above) is used in</font><br>
<font size="-1">describing a developmental stage of the anther
development. This is</font><br>
<font size="-1">inconsistent with its usage as synonym in anatomy
section.</font><br>
</blockquote>
<blockquote type="cite" cite><font
size="-1">-----------------------</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">WE NEED TWO TERMS FOR
'archesporial cell' representing its location in</font><br>
<font size="-1">either the ANTHER and OVULE. These will be children
of 'cell'</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">SUGGEST new term
names??</font></blockquote>
<div><br>
<br>
</div>
<div>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".</div>
<div><br></div>
<div>P.</div>
<div><br></div>
<blockquote type="cite" cite><br></blockquote>
<blockquote type="cite" cite><font size="-1">Delete the synonym from
'megasporocyte'.</font><br>
</blockquote>
<blockquote type="cite" cite><font
size="-1">-----------------------------</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">For further
reading</font><br>
<a href=""><font
size="-1">http://www.ncbi.nlm.nih.gov/entrez/query.<span
></span>fcgi?cmd=retrieve&db=pubmed&list_uids=104<span
></span>65788&dopt=Abstract</font></a><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">In arabidopsis anther of
wild-type flowers, hypodermal cells at the four</font><br>
<font size="-1">corners of the anther expand radially and
differentiate into</font><br>
<font size="-1">archesporial cells at stage 2 of anther development
in stage 7 flowers</font><br>
<font size="-1">(Fig. 1C; Sanders et al. 1999). Archesporial cells
undergo periclinal</font><br>
<font size="-1">divisions, giving rise to an inner primary
sporogenous cell (PSC) layer</font><br>
<font size="-1">and an outer primary parietal cell (PPC) layer at
stage 3 anthers (Fig.</font><br>
<font size="-1">1D).</font><br>
</blockquote>
<blockquote type="cite" cite><font size="-1">In Arabidopsis stage
10-11 flowers, an archesporial cell forms from a</font><br>
<font size="-1">single hypodermal cell at the top of the ovule
primordium, becoming more</font><br>
<font size="-1">prominent than neighboring cells because of its
slightly larger size,</font><br>
<font size="-1">denser cytoplasm, and more conspicuous nucleus (Fig.
2A). In some</font><br>
<font size="-1">flowering plants, the archesporial cell of the ovule
undergoes a</font><br>
<font size="-1">periclinal division, and subsequently the inner cell
differentiates into</font><br>
<font size="-1">the megasporocyte. However, in the majority of
flowering plants</font><br>
<font size="-1">including Arabidopsis, the archesporial cell
elongates and polarizes</font><br>
<font size="-1">longitudinally, and directly differentiates into the
megasporocyte or</font><br>
<font size="-1">megaspore mother cell (MMC) with obvious change in
cell shape from near</font><br>
<font size="-1">rectangular to teardrop (Figs. 2B and 7B, below;
Willemse 1981;</font><br>
<font size="-1">Grossniklaus and Schneitz 1998)</font></blockquote>
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