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<div>If we went into our didactic mode we would synonymize this use of
"pulvinus" under swollen node - which is what such things
are called in Caryophyllaceae, Amaranthaceae, etc. I would
prefer that.</div>
<div><br></div>
<div>P.</div>
<div><br></div>
<blockquote type="cite" cite><font face="Arial" size="-1"
color="#0000FF">Hi POC colleagues,</font></blockquote>
<blockquote type="cite" cite> </blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1"
color="#0000FF">Following Chapman & Peat ("An Introduction
to the Grasses - including bamboos and cereals", 1992; CAB
International; ISBN: 0851988032) the pulvinus in some members of the
Poaceae does not appear to be homologous with the pulvinus in
eudicots. To quote from Chapman & Peat, p.10 under the
subtitle of "Stems" - "The nodes are usually visible
as slight swellings of the stem, but in some cases, notably tropical
species the node may be so enlarged as to form a pulvinus." Two
photos are provided - the one showing a conventional node of Bromus
sterilis & the other the swollen pulvinus of Digitaria exilis. In
eudicots the pulvinus appears to be explicitly associated with the
proximal end of the petiole or petiolule while in the Poaceae I'm
unclear whether the pulvinus is entirely formed by the nodal tissue
of the culm or by both the nodal tissue of the culm and the base of
the leaf sheath or just the latter (...another research
opportunity!).</font></blockquote>
<blockquote type="cite" cite> </blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1"
color="#0000FF">Is this leading us to another 'sensu Poaceae' term? -
Hmmm - perhaps this is unavoidable at present. The needed definition
must make a clear distinction between the two
terms.</font></blockquote>
<blockquote type="cite" cite> </blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1"
color="#0000FF">- Leszek</font><br>
<font face="Arial" size="-1" color="#0000FF"></font></blockquote>
<blockquote type="cite" cite><font face="Arial" size="-1"
color="#0000FF">*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*<br>
P. Leszek D. Vincent Ph.D., FLS<br>
Plant Science Unit<br>
Res. Prof. Dept. of Horticulture<br>
215 Curtis Hall<br>
University of Missouri-Columbia<br>
Columbia<br>
MO 65211-7020<br>
USA<br>
Ph: (573) 884-3716; Fax:(573) 884-7850;<br>
Email: Leszek@missouri.edu<br>
Associate Curator, Dunn-Palmer Herbarium (UMO);<br>
Research Associate, Missouri Botanical Garden (MO), USA;<br>
Plant Systematist on The Plant Ontology Consortium - NSF award
0321666<br>
*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*</font><br>
<font face="Arial" size="-1" color="#0000FF"></font></blockquote>
<blockquote type="cite" cite><br>
<blockquote>
<hr></blockquote>
<blockquote><font size="-1"><b>From:</b> owner-po-dev@brie4.cshl.org
[mailto:owner-po-dev@brie4.cshl.org]<b> On Behalf Of</b> Kellogg,
Elizabeth A.<br>
<b>Sent:</b> Wednesday, December 08, 2004 3:36 PM<br>
<b>To:</b> po-dev@plantontology.org; Pankaj Jaiswal<br>
<b>Subject:</b> RE: Fw: Wheat anatomy (fwd)</font><br>
<font size="-1"></font></blockquote>
<blockquote>I'm not convinced of the identity between the pulvinus as
the term is applied in eudicots and term applied in wheat. I
looked at a couple of the references that Pankaj sent,and don't quite
see what the structure is that they are referring to as pulvinus - it
looks like a part of the internode to me, but maybe it's because I
can't easily see the details of the photos.</blockquote>
<blockquote> The apex of the ovary in all Triticeae is
covered with macrohairs, and these persist in the fruit. I
guess this is what is called the brush. I don't think I've ever
heard the term "bristle" applied to those
hairs.</blockquote>
<blockquote>Toby<br>
<blockquote><font size="-1">-----Original Message-----<br>
<b>From:</b> owner-po-dev@brie4.cshl.org on behalf
of Pankaj Jaiswal<br>
<b>Sent:</b> Wed 12/8/2004 2:11 PM<br>
<b>To:</b> po-dev@plantontology.org; Victoria<br>
<b>Cc:</b><br>
<b>Subject:</b> Re: Fw: Wheat anatomy (fwd)</font><br>
<font size="-1"></font></blockquote>
<blockquote><br>
<br>
</blockquote>
<blockquote><font size="-1">Katica Ilic wrote:<br>
<br>
> Hi Victoria,<br>
><br>
> I looked through your list shortly after I received it, just
didn't<br>
> have time to reply. As I mentioned in my earlier e-mail, most of
the terms<br>
> (39 terms exactly) are already in the PO. Remaining three terms
are not in the PO,<br>
> and one sould be introduced, term pulvinus, to which I provided
definition<br>
> from K Esau.<br>
><br>
> New term: pulvinus<br>
><br>
> Definition: An enlargement of the petiole of a leaf, or
petiolule of a<br>
> leaflet, at its base. A structure that has a role in the
movements of a<br>
> leaf<br>
> or leaflet. (def from K Esau).<br>
><br>
> I need to see where exactly this term would go into Plant
Structure<br>
> Ontology.<br>
><br>
<br>
By your definition, it is the swollen part of the petiole. Whereas
in<br>
cereal crops, the leaf does not have a petiole. All they have is a
leaf<br>
sheath and leaf lamina. However sheath can be regarded as a
structural<br>
homolog of petiole. I guess the wheat people are calling is a
different<br>
structure found at the base of the leaf sheath and the structure
seems<br>
to play a role in gravitropism.. I looked at fig-1 of the
following</font></blockquote>
<blockquote><font size="-1">reference<br>
</font><a href="http://archiv.fgk.org/01/BLT/dispersion/"><font
size="-1">http://archiv.fgk.org/01/BLT/dispersion/</font></a><font
size="-1"><br>
<br>
Kaufman et al</font> <a
href="http://www.jstor.org/view/00029122/di001875/00p0367d/0"><font
size="-1">http://www.jstor.org/view/00029122/di0018<span
></span>75/00p0367d/0</font></a><font size="-1"> are<br>
calling it "Leaf sheath pulvinus".<br>
<br>
Looks like it can have the following lineage in ontology<br>
<br>
leaf<br>
..[p] petiole<br>
......[p] pulvinus (PO:new term)<br>
..........[i] leaf sheath pulvinus (PO:new term)<br>
..[p] leaf sheath<br>
......[i] leaf sheath pulvinus (PO:new term)<br>
<br>
<br>
More refs:<br>
</font><a
href="http://jxb.oupjournals.org/cgi/content/full/52/358/1029"><font
size="-1">http://jxb.oupjournals.org/cgi/content/fu<span
></span>ll/52/358/1029</font></a><font size="-1"><br>
</font><a
href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11537463&dopt=Abstract"
><font size="-1">http://www.ncbi.nlm.nih.gov/entrez/query.<span
></span>fcgi?cmd=Retrieve&db=PubMed&list_uids=115<span
></span>37463&dopt=Abstract</font></a><font size="-1"><br>
</font><a
href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=8490136&dopt=Abstract"
><font size="-1">http://www.ncbi.nlm.nih.gov/entrez/query.<span
></span>fcgi?cmd=Retrieve&db=PubMed&list_uids=849<span
></span>0136&dopt=Abstract</font></a><font size="-1"><br>
<br>
<br>
<br>
> The last two are terms 'crease' and term 'beard'. I need to find
out if<br>
> they can be synonyms of the existing terms.<br>
><br>
<br>
If I am not wrong, the "beard" is a synonym for
"awn".<br>
<br>
"crease is a particular type of morphological character found in
grains<br>
of Triticeae. I suggest creating a new term.<br>
<br>
Suggested lineage in PO<br>
Seed<br>
..[p]..crease<br>
definition: the indentation on the ventral side of the seed as found
in<br>
the members of Triticeae<br>
<br>
<br>
I found one more term "brush" under "seed"<br>
It is often called as bristle, but in order to avoid having
confusion<br>
between bristle leaf and bristles found on seed, my suggestion is
to<br>
call it "seed bristle"<br>
<br>
seed bristle: fine hairs on the distal end of the seed as found in
the<br>
members of Triticeae<br>
<br>
Seed<br>
..[p]..seed bristle
(synonym: brush)</font></blockquote>
</blockquote>
</blockquote>
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