[Fwd: RE: genes for grazing / harvesting wheat]

[kellogge]

Liuling is correct that the stage does fit well into any of the PO  
development categories.  The pooid grasses develop in a way that is  
rather different from that of other grasses, in that the meristem is  
kept just about at ground level for quite a while.  As Pankaj notes,  
this is probably about SE.00 or SE.01, in terms of stem elongation, but  
has no counterpart under "reproductive growth" because the  
inflorescence is certainly not visible except by really careful  
dissection.
Toby

On Aug 21, 2006, at 10:36 AM, Pankaj Jaiswal wrote:

> This a forwarded message from Yan Liuling with reference to a previous  
> enquiry on hollow stem stage in winter wheat.
>
> -Pankaj
>
> -------- Original Message --------
> Subject: 	RE: genes for grazing / harvesting wheat
> Date: 	Sat, 19 Aug 2006 22:09:54 -0500
> From: 	Yan, Liuling <liuling.yan at okstate.edu>
> To: 	Pankaj Jaiswal <pj37 at cornell.edu>, Dave Matthews
> <matthews at greengenes.cit.cornell.edu>
> References: 	<200608170241.k7H2fHnv002436 at greengenes.cit.cornell.edu>
> <44E48CE1.5060300 at cornell.edu>
>
>
>
> Hi Pankaj (cc: Dave),
>
> Thank you very much for so much information and elaboration on it. When
> we talk about vernalization, we always use heading time or flowering
> time as outcome of vernalization. But in this particular case I need to
> use the elongation stage of the first hollow stem as a creterion . In
> practice, all winter varieties have a similar flowering time, no matter
> how much vernalization they require, but they have signifcant
> differences in reaching the elongation stage of the first hollow stem
> particularly in a warm winter season. Therefore differences in earlier
> developmental stages should explain vernalization effects much better
> than heading or flowering itme. In Oklahoma, when the lenght of the
> first hollow stem is longer than 2cM, the stem is considered  
> detectable,
> which is a signal that cattles need to take away from the field.
> Compared with Zadoks scale it should be 31. This is what I can explain
> right now.
>
> Thank you again and have a nice weekend.
>
> Liuling
>
>
> ----------------------------------------------------------------------- 
> -
> From: Pankaj Jaiswal [mailto:pj37 at cornell.edu]
> Sent: Thu 8/17/2006 10:36 AM
> To: Dave Matthews; Yan, Liuling
> Cc: Mark Sorrells; POC-dev
> Subject: Re: genes for grazing / harvesting wheat
>
> Hi Liuling and Dave,
>
> According to the scales developed for Triticeae by Zadoks and Haun in
> early 1970's  [Haun, J.R. 1973. Visual quantification of wheat
> development. Agron. J. 65: 116-119.] and [Zadoks, J.C., T.T. Chang, and
> C.F. Konzak. 1974. A decimal code for growth stages of cereals. Weed
> Res. 14: 415-421.] and those mentioned on the site at
> http://www.usask.ca/agriculture/plantsci/winter_cereals/Winter_wheat/ 
> CHAPT10/cvchpt10.php
> the actual reproductive stage (the very initiation and differentiation
> of the inflorescence starts way too early. Spikelet development on the
> microscopic head is usually completed by the time the first node is 0.4
> inches (1 cm) above the soil surface. The terminal spikelet is produced
> at about Zadoks stage 31. A rapid loss of younger, poorly developed
> tillers also normally starts at this stage
> (http://www.usask.ca/agriculture/plantsci/winter_cereals/Winter_wheat/ 
> CHAPT10/cvchpt10.php#stem).
>
> Probably the stage you are looking for the hollow stem is somewhat in
> the range of Zadoks 15-18, Zadoks 34-36. These stages are overlapping.
> This needs confirmation.
>
>   The booting stage is very late in that sense because by that time the
> boot is already swollen, the inflorescence is well developed and ready
> to exsert out for heading stage. Therefore you will have to determine
> the stages for a couple of the standard cultivars and germplasms in a
> couple of growth conditions to see the variability. As far as I know
> after this evaluation you will be able to predict the desired stage by
> taking into account the genotype and environmental effects. You will
> find similar studies by
>
> McMaster GS, Wilhelm WW, Frank AB (2005) Developmental sequences for
> simulating crop phenology for water-limiting conditions. Australian
> Journal of Agricultural Research 56: 1277-1288
>
> Skiw PEJ, Jame YW, Kryzanowski L (2001) Phenological development of
> spring barley in a short-season growing area. Agron. J 93: 370-379
>
> In all due respect you can use either of the Zadoks, Feekes or Haun
> scales as well to map your stages.
>
> Considering the Zadok scale 31 the corresponding stage defined by Plant
> Ontology is SE.01 one node or internode visible [PO:0007091]
> http://www.plantontology.org/amigo/go.cgi? 
> view=details&show_associations=terms&search_constraint=terms&depth=0&qu 
> ery=PO:0007091
> <http://www.plantontology.org/amigo/go.cgi? 
> view=details&show_associations=terms&search_constraint=terms&depth=0&qu 
> ery=PO:0007091>
>
> For other Zadok scale search the Plant Ontology for terms using  
> 'Zadok'.
> The scale is listed as a synonym where ever applicable. e.g.
> http://www.plantontology.org/amigo/go.cgi? 
> session_id=7417b1155827789&page=2&view=query&search_constraint=terms&de 
> pth=&query=zadok&action=query
> <http://www.plantontology.org/amigo/go.cgi? 
> session_id=7417b1155827789&page=2&view=query&search_constraint=terms&de 
> pth=&query=zadok&action=query>
>
>
> Please let me know if you need more help. I will be happy to hear you
> feedback.
>
> Pankaj
> [Plant Ontology]
>
>
>
Elizabeth A. Kellogg
E. Desmond Lee and Family Professor of Botanical Studies
Department of Biology
University of Missouri-St. Louis
St. Louis, MO 63121
Tel: 314-516-6217; FAX: 314-516-6233
http://www.umsl.edu/services/kellogg/