vascular bundle

Mon Aug 30 13:17:14 EDT 2004

A few genes whose expression is related to vascular
tissue/pattern/development/differentiation are listed below.

Due to the use of the term ‘vascular bundle’ by these authors it would be
difficult to clearly annotate them to a particular vascular cell type.

CVP1 genes: involved in vascular tissue pattern, the author has shown
whole leaf pictures and refers to vasculature/vein as the vascular bundle
Fig 1, and also  with reference to the cross section  it is referred to as
the anatomy of “cotyledon vascular bundle” Fig 6.

http://www.plantcell.org/cgi/content/full/11/11/2123

AtPIN1 gene: involved in the regulation of polar auxin transport,  in Fig
4 the authors mention that the anti AtPIN1 formed continuous vertical cell
strands in vascular bundle.
http://www.sciencemag.org/cgi/content/full/282/5397/2226

ATHB 8 gene: the gene involved in regulation of vascular development, the
authors   refer to vascular bundle in the cross-section Fig 5
http://www.plantphysiol.org/cgi/content/full/126/2/643

COV1 gene: this gene is involved with the regulation of vascular pattern
refer to Fig 1.
http://dev.biologists.org/cgi/content/full/130/10/2139

These genes are from Arabidopsis, my concern is with genes/gene products
related to cereal plants wherein the localization within vascular tissue
is not clear such as the Glutamine synthase in rice and barley. And auxin
related genes.

GS1: Glutamate synthase is specific to vascular bundle according this paper.
http://jxb.oupjournals.org/cgi/reprint/52/356/591

anu

> 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
> ************************
>
>
>
>