Environmental Effects on Soybean with Modified Phosphorus and Sugar Composition
- Laura M. Maupina,
- M. Luciana Rossoa and
- Katy M. Rainey *a
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.Please view the pdf by using the Full Text (PDF) link under 'View' to the left.
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