New sources of soybean seed meal and oil composition traits identified through TILLING

• Main Authors: Bilyeu Kristin D, Dierking Emily C
• Format: Article
• Language: English
• Published: BMC 2009-07-01
• Series: BMC Plant Biology
• Online Access: http://www.biomedcentral.com/1471-2229/9/89
• ISSN: 1471-2229

<p>Abstract</p> <p>Background</p> <p>Several techniques are available to study gene function, but many are less than ideal for soybean. Reverse genetics, a relatively new approach, can be utilized to identify novel mutations in candidate genes; this technique has not produced an allelic variant with a confirmed phenotype in soybean. Soybean raffinose synthase genes and microsomal omega-6 fatty acid desaturase genes were screened for novel alleles in mutagenized soybean populations.</p> <p>Results</p> <p>Four mutations in independent lines were identified in the raffinose synthase gene <it>RS2</it>; two mutations resulted in amino acid mutations and one resulted in an altered seed oligosaccharide phenotype. The resulting phenotype was an increase in seed sucrose levels as well as a decrease in both raffinose and stachyose seed oligosaccharide levels. Three mutations in independent lines were identified in the omega-6 fatty acid desaturase gene <it>FAD2-1A</it>; all three mutations resulted in missense amino acid mutations and one resulted in an altered seed fatty acid profile that led to an increase in oleic acid and a decrease in linoleic acid in the seed oil.</p> <p>Conclusion</p> <p>The oligosaccharide phenotype controlled by the novel <it>RS2 </it>allele is similar to previously observed seed oligosaccharide phenotypes in <it>RS2 </it>mutant (PI 200508) allele-containing lines. Due to the anti-nutritional characteristics of raffinose and stachyose, this represents a positive change in seed composition. The fatty acid phenotype controlled by the novel <it>FAD2-1A </it>allele controls an increase in oleic acid in the seed oil, a phenotype also observed in a line previously characterized to have a null allele of the <it>FAD2-1A </it>gene. Molecular marker assays were developed to reliably detect the inheritance of the mutant alleles and can be used in efficient breeding for these desired seed phenotypes. Our results serve as the first demonstration of the identification of soybean mutants controlling seed phenotypes discovered through the reverse genetics technique TILLING.</p>