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This article in CS

  1. Vol. 51 No. 2, p. 642-650
     
    Received: July 6, 2010


    * Corresponding author(s): kmrainey@vt.edu
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doi:10.2135/cropsci2010.07.0396

Environmental Effects on Soybean with Modified Phosphorus and Sugar Composition

  1. Laura M. Maupina,
  2. M. Luciana Rossoa and
  3. Katy M. Rainey *a
  1.  aDep. of Crop and Soil Environmental Sciences, Virginia Polytechnic Institute and State Univ., Blacksburg, VA 24061

Abstract

Development of soybeans [Glycine max (L.) Merr.] with modified phosphorus (P) and sugar composition adds value to soybean meal. The identification and release of the soybean line V99-5089 with a mutation in the D-myo-inositol 3-phosphate synthase 1 gene (MIPS1) provides a germplasm source that dually enhances both P and sugar composition of soybeans. An evaluation of the recombinant inbred line population from the cross of V99-5089 × Essex was completed at three environments in 2 yr. Phenotypic selection for modified composition was slightly more effective than marker-assisted selection with the Satt453 marker, which was 87% efficient. In the mutant lines, a significant genotype × environment interaction was shown for inorganic phosphorus (Pi) concentration but not sugar concentration. Correlations for improving P and sugar composition were favorable, and with the exception of emergence there were no strong correlations with agronomic traits. The correlation of emergence with Pi was significant (r = −0.59), indicating reduced emergence due to the mutation. Reduced emergence is a problem in low phytate germplasm generally and further research is necessary to genetically improve emergence of low phytate lines.

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