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<DIV dir=ltr align=left><SPAN class=946562218-09122004><FONT face=Arial
color=#0000ff size=2>Hi POC colleagues,</FONT></SPAN></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT> </DIV>
<DIV><SPAN class=946562218-09122004></SPAN><FONT face=Arial><FONT
color=#0000ff><FONT size=2>F<SPAN class=946562218-09122004>ollowing 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!). </SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=946562218-09122004></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=946562218-09122004>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.</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=946562218-09122004></SPAN></FONT></FONT></FONT> </DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=946562218-09122004>- Leszek</SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial><FONT color=#0000ff><FONT size=2><SPAN
class=946562218-09122004><!-- Converted from text/plain format -->
<P><FONT size=2>*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*<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>
</P></SPAN></FONT></FONT></FONT></DIV>
<DIV><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><FONT face=Arial color=#0000ff size=2></FONT><FONT face=Arial
color=#0000ff size=2></FONT><FONT face=Arial color=#0000ff
size=2></FONT><BR></DIV>
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<FONT face=Tahoma size=2><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)<BR></FONT><BR></DIV>
<DIV></DIV>
<DIV>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.
</DIV>
<DIV> 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.</DIV>
<DIV>Toby</DIV>
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<DIV><FONT size=2>-----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)<BR><BR></FONT></DIV><BR><BR>
<P><FONT size=2>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<BR>reference<BR><A
href="http://archiv.fgk.org/01/BLT/dispersion/">http://archiv.fgk.org/01/BLT/dispersion/</A><BR><BR>Kaufman
et al <A
href="http://www.jstor.org/view/00029122/di001875/00p0367d/0">http://www.jstor.org/view/00029122/di001875/00p0367d/0</A>
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><A
href="http://jxb.oupjournals.org/cgi/content/full/52/358/1029">http://jxb.oupjournals.org/cgi/content/full/52/358/1029</A><BR><A
href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11537463&dopt=Abstract">http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=11537463&dopt=Abstract</A><BR><A
href="http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=8490136&dopt=Abstract">http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=PubMed&list_uids=8490136&dopt=Abstract</A><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)<BR><BR><BR></FONT></P></BLOCKQUOTE></BLOCKQUOTE></BODY></HTML>