[Fwd: Rice Growth Stages]

[Pankaj Jaiswal]

FYI and E mail from Paul Counce

pcounce wrote:
> 
> Pankaj,
>    Dr. Karen Moldenhauer forwarded your email to me and asked me to reply.
> Here are my thoughts:
>     The rice growth staging system provides an objective, adaptive and uniform
> system for expressing rice development.   The system is authentic.
>         The system was developed at the impetus of the Rice Technical Working Group
> beginning with committee formation in 1994.  In 1998 a special discussion
> session for the proposed system was held at the RTWG meeting in Reno, Nevada
> (Counce, P.A. 1998. Rice growth staging committee report. pp. 9-10 In
> Proceedings of the Twenty Seventh Rice Technical Working Group Meeting in
> Reno, Nevada).   This session was attended by approximately 150 scientists
> from all over the world.  Later in 1998 (August 30 - September 3) the
> International Symposium on Rice Germplasm Evaluation and Enhancement at
> Stuttgart, Arkansas,  a workshop was held and input was obtained from
> scientists there.     Later in 1998, the system was presented to scientists in
> the People's Republic of China (Seminar presented to the faculty of the
> Chengdu Institute of Biology, Chengdu, People’s Republic of China on September
> 12).  In 1999, the system was presented to scientists at the Temperate Rice
> Conference in Sacramento, California (Counce, P.A., T.C. Keisling , and A.J.
> Mitchell. 1999. An adaptive, objective rice growth staging system.  Paper
> presented to the Temperate Rice Conference held at Sacramento, CA, June 13-17,
> 1999).   In 2000, the completed system was presented to scientists at the Rice
> Technical Working Group at Biloxi, Mississippi.  Also in that year, the system
> was published in Crop Science (Counce, P.A., T.C. Keisling, and A.J. Mitchell.
> 2000. A uniform, objective and adaptive system for expressing rice
> development. Crop Science 40:436-443).  Crop Science is an international
> journal with a high citation impact and a large number of subscribers.
> Reprints have been distributed to scientists all over the world by request
> since 2000.  In addition, posters with the illustrations have also been
> distributed widely by request.  The article provides precise definition for
> the stages.  The system has been cited in several international journals and
> will be cited in many more in the future.
>         The system is based on the uniform application of objective criteria for
> determining a growth stage so that 2 people examining the same plant will
> arrive at the same answer.  The defined growth stages are specific and keyed
> to the main stem.  The system is consistent with the proposed universal plant
> growth staging system (Keisling, T.C., and P.A. Counce. 1999. Universal plant
> growth staging revisited.  Agronomy Abstracts pp. 110 and Counce, P.A., T.C.
> Keisling, and D.C. Annis. 2000. Framework for an objective, universal plant
> growth staging system adapted to plant development.  Presented at the Annual
> meeting of the American Society of Agronomy in Minneapolis, Minnesota.)  In
> addition, the rice growth staging system’s Vstages are consistent with  the
> corn growth staging system.  The nomenclature (R1, R2, V1, V2) is the same as
> the corn and soybean growth staging system nomenclature.
>         The system is especially well suited to the needs of the Gramene database
> because it is based on objective, biologically based criteria rather than
> subjective, non-biological criteria.  All of the stages you mentioned are
> accomodated by the system except imbibition and tillering.  Imbibition is
> intermediate between Stages S0 and S1.  Tillering is not a stage but it is
> related to the stage.  Most modern rice varieties can tiller at the V4 Growth
> Stage with the first tiller arising from Node 2.    Tillering, however, does
> not necessarily occur at the V4 Stage because conditions, particularly light
> and nitrogen fertility, can delay tillering until much later.  Consequently,
> one plant may tiller at V4 and another at V7 depending upon environmental
> conditions.  One way, spelled out in the rice growth staging article, would be
> to note tillering as (V5tillering or V6tillering etc.).
>         A website with some more material is:
> 
>    http://www.uaex.edu/nerec/RTWG.htm
> 
>      Also on my faculty website is information on how to growth stage a rice
> plant:
>         http://www.uark.edu/depts/agronomy/index.html
> 
>         For these reasons the rice growth staging system I think the would work
> extremely well for for the Gramene Database vocabulary to enhance the
> usefulness of that database and its meaninfulness to scientists.
> 
>      I would be happy to discuss any aspects of the system for your gramene
> database vocabulary.  I will gladly send you a reprint of the rice growth
> staging system article and the poster.  Just let me know and send me your
> mailing or shipping address.
> 
>         Sincerely,
>         Paul Counce

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Pankaj Jaiswal, Ph.D.                                   
Postdoctoral Associate
Dept. of Plant Breeding                             
Cornell University                                   
Ithaca, NY-14853, USA   

Tel:+1-607-255-3103 / Fax:+1-607-255-6683
E mail: pj37 at cornell.edu
http://www.gramene.org   
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