Identification of simple sequence repeat markers linked to lipoxygenase-1 gene in soybean

Off-flavour generated in soy products is ascribed to soybean seed lipoxygenase-1, lipoxygenase-2 and lipoxygenase-3, controlled by single dominant genes Lox1, Lox2 and Lox3, respectively. Lox2 locus has already been mapped and reported to be tightly linked with Lox1 locus. The objective of the present study was to map Lox1 locus by investigating the SSR markers reported to be linked with Lox2 locus and the neighbouring SSR markers in two mapping populations of 116 and 91 plants developed from LSb1 x PI408251 and JS335 x PI408251, respectively. Parental polymorphism was surveyed using SSR markers Sat_074, Satt522 reported to be linked with Lox2 locus and the SSR markers in its proximity. F-2:3 seeds were used for assaying lipoxygenase-1 to identify the genotype of the F-2 individuals. SSR marker Satt656 was found to be tightly linked with Lox1 locus at distance of 3.6 and 4.8 cM in the mapping population of LSb1 x PI408251 and JS335 x PI408251, respectively. SSR marker Satt656 can be useful for marker assisted selection for transferring recessive allele of lipoxygenase-1 in the background of high yielding soybean genotypes.