Fw: Wheat anatomy (fwd)

[Peter Stevens]

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.

P.

>Hi POC colleagues,
>
>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!).
>
>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.
>
>- Leszek
>
>*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
>P. Leszek D. Vincent Ph.D., FLS
>Plant Science Unit
>Res. Prof. Dept. of Horticulture
>215 Curtis Hall
>University of Missouri-Columbia
>Columbia
>MO 65211-7020
>USA
>Ph: (573) 884-3716; Fax:(573) 884-7850;
>Email: Leszek at missouri.edu
>Associate Curator, Dunn-Palmer Herbarium (UMO);
>Research Associate, Missouri Botanical Garden (MO), USA;
>Plant Systematist on The Plant Ontology Consortium - NSF award 0321666
>*=*=*=*=*=*=*=*=*=*=*=*=*=*=*=*
>
>
>
>From: owner-po-dev at brie4.cshl.org 
>[mailto:owner-po-dev at brie4.cshl.org] On Behalf Of Kellogg, Elizabeth 
>A.
>Sent: Wednesday, December 08, 2004 3:36 PM
>To: po-dev at plantontology.org; Pankaj Jaiswal
>Subject: RE: Fw: Wheat anatomy (fwd)
>
>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.
>    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.
>Toby
>
>-----Original Message-----
>From: owner-po-dev at brie4.cshl.org on behalf of Pankaj Jaiswal
>Sent: Wed 12/8/2004 2:11 PM
>To: po-dev at plantontology.org; Victoria
>Cc:
>Subject: Re: Fw: Wheat anatomy (fwd)
>
>
>
>Katica Ilic wrote:
>
>>  Hi Victoria,
>>
>>  I looked through your list shortly after I received it, just didn't
>>  have time to reply. As I mentioned in my earlier e-mail, most of the terms
>>  (39 terms exactly) are already in the PO. Remaining three terms 
>>are not in the PO,
>>  and one sould be introduced, term pulvinus, to which I provided definition
>>  from K Esau.
>>
>>  New term: pulvinus
>>
>>  Definition: An enlargement of the petiole of a leaf, or petiolule of a
>>  leaflet, at its base. A structure that has a role in the movements of a
>>  leaf
>>  or leaflet. (def from K Esau).
>>
>>  I need to see where exactly this term would go into Plant Structure
>>  Ontology.
>>
>
>By your definition, it is the swollen part of the petiole. Whereas in
>cereal crops, the leaf does not have a petiole. All they have is a leaf
>sheath and leaf lamina.  However sheath can be regarded as a structural
>homolog of petiole. I guess the wheat people are calling is a different
>structure found at the base of the leaf sheath and the structure seems
>to play a role in gravitropism.. I looked at fig-1 of the following
>reference
><http://archiv.fgk.org/01/BLT/dispersion/>http://archiv.fgk.org/01/BLT/dispersion/
>
>Kaufman et al 
><http://www.jstor.org/view/00029122/di001875/00p0367d/0>http://www.jstor.org/view/00029122/di001875/00p0367d/0 
>are
>calling it "Leaf sheath pulvinus".
>
>Looks like it can have the following lineage in ontology
>
>leaf
>..[p] petiole
>......[p] pulvinus (PO:new term)
>..........[i] leaf sheath pulvinus (PO:new term)
>..[p] leaf sheath
>......[i] leaf sheath pulvinus (PO:new term)
>
>
>More refs:
><http://jxb.oupjournals.org/cgi/content/full/52/358/1029>http://jxb.oupjournals.org/cgi/content/full/52/358/1029
><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
><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
>
>
>
>>  The last two are terms 'crease' and term 'beard'. I need to find out if
>>  they can be synonyms of the existing terms.
>>
>
>If I am not wrong, the "beard" is a synonym for "awn".
>
>"crease is a particular type of morphological character found in grains
>of Triticeae. I suggest creating a new term.
>
>Suggested lineage in PO
>         Seed
>         ..[p]..crease
>definition: the indentation on the ventral side of the seed as found in
>the members of Triticeae
>
>
>I found one more term "brush" under "seed"
>It is often called as bristle, but in order to avoid having confusion
>between bristle leaf and bristles found on seed, my suggestion is to
>call it "seed bristle"
>
>seed bristle: fine hairs on the distal end of the seed as found in the
>members of Triticeae
>
>         Seed
>         ..[p]..seed bristle (synonym: brush)
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