vascular bundle

[Kellogg, Elizabeth A.]

Isn't "vascular bundle" simply the term applied to a vein when viewed in cross section?  I agree with Katica's earlier message that the term vascular bundle should remain obsolete.  The gene in question can be annotated to vein or vascular tissue if it can't be annotated to one of the parts of the vein.  I haven't checked the publication myself, but I'd be pretty surpirsed if it were actually expressed in every cell of the vein.  

If the group decides to un-obsolete (great verb!) the term, then the ontology would have to be considerably more complex than Pankaj outlined earlier.  I think it would be more like:

Sporophyte
--p--vascular bundle
-----i--leaf VB
-----i--stem VB
-----i--root VB
-----i--stamen VB
-----i--petal VB
-----i--sepal VB
-----i---etc., one each for every organ
-----p--xylem
-----p--phloem
-----p--cambium
-----p--bundle sheath
---------i--mestome sheath
---------i--parenchyma sheath
-----p--parenchyma
-----p--schlerenchyma
--p--shoot
-----p--stem
--------p--stem VB
-----p--leaf
--------p--root VB
--p--root
-----p--root VB

Finally, to respond to an earlier message in this thread - veins (vascular bundles) are present in all plants, not just C4s.   
Toby


-----Original Message-----
From:	owner-po-dev at brie4.cshl.org on behalf of Pankaj Jaiswal
Sent:	Fri 8/27/2004 9:55 AM
To:	po-dev at plantontology.org
Cc:	
Subject:	Re: vascular bundle

The purpose for asking this term was, that they are present in all kinds 
of organs and not just limited to the leaves.

In leaves mid veins are representing the vasculature and the leaf VB is 
a part of that network of vasculature and as Dave pointed out there are 
many other parts as well.

My suggestion is to include this term. If agreed, the other question 
would be, where should we place it, it's not just a tissue, but contains 
a lot of tissue types. Thus it is an organized structure or a region in 
an organ.

The proposed structure is
i = instance of
p = part of


Sporophyte
--p--vascular bundle
-----i--leaf VB
-----i--stem VB
-----i--root VB
-----i--stamen VB
-----p--xylem
-----p--phloem
-----p--cambium
--p--shoot
-----p--stem
--------p--stem VB
-----p--leaf
--------p--root VB
--p--root
-----p--root VB

I am not sure....

#1
Its true that that the three terms xylem, phloem and cambium are not 
always part of VB.

But as we know the PART of relationship we have suggests that, a child 
is a partof but not always a partof parent term. Thus this lineage seems 
correct.

#2
Do gametophytes also have VB?



Suggested definitions for VB are

by Fahn: A strand of conducting tissue

By Essau: A strand like part of the vascular system composed of xylem 
and phloem. occurs in stem, leaf and flower.

By Dickison: A strand like association of primary xylem and phloem that 
extends throughout the plant body.

http://www.cogsci.princeton.edu/cgi-bin/webwn?stage=1&word=vascular+bundle
a unit strand of the vascular system in stems and leaves of higher 
plants consisting essentially of xylem and phloem



If that is an accepted structure then we may need a further 
instantiation of the terms xylem, phloem and cambium, because as of now 
these are the generic terms. But that is a topic for another request to 
be sent on the mailing list.


Thanks
Pankaj




Anuradha Pujar wrote:

> 
> Hello,
> 
> These are just a couple of references, please have a look.
> 
> 
> http://www.plantphysiol.org/cgi/content/full/129/3/1019
> 
> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=14630956
> 
> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=15258165
> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=14614507
> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=12615934
> http://www.ncbi.nlm.nih.gov/entrez/query.fcgi?cmd=Retrieve&db=pubmed&dopt=Abstract&list_uids=2102372
> 
> anu
> 
> 

-- 
************************
Pankaj Jaiswal, PhD
G15-Bradfield Hall
Dept. of Plant Breeding
Cornell University
Ithaca, NY-14853, USA

Tel: +1-607-255-3103
      +1-607-255-4109
Fax: +1-607-255-6683
http://www.gramene.org
************************



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