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Selection of soybean mutants with increased concentrations of seed methionine and cysteine. Soybean meal is low in the amino acid methionine for some
species. Research as shown that the low level of methionine is attributed
to an abundance of the beta chain of beta-conglycinin, a storage protein
that lacks methionine. Researchers at Iowa State University mutagenized
soybean seed and located a methionine-over producing type that was then
used as a parent in crossing program. The resultant soybean cross that
contained normal levels of nitrogen and 16.2 percent more sulfur than
the parent line. Soybean seeds from this cross contained about 20 percent
more methionine and cysteine that the parent line. These results indicate
that it is possible to increase the sulfur containing amino acids in
soybeans by manipulating the individual storage protein. |
