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Genetic Analysis of a Null-Allele for Lipoxygenase-2 in Soybean¹

Soybean [Glycine max (L.) Merr.] seeds contain at least three isomeric forms of lipoxygenase. We have identified a soybean line, PI 86.023, which is homozygous for a gene that confers the absence of the lipoxygenase-2 isozyme. Analysis of electrophoretic banding patterns of seed extracts from the F₂ and F₃ progeny of crosses between PI 86.023 and breeding lines containing null-alleles for lipoxygenase- 1 and -3 indicated that this gene was tightly linked to the Lx₁ locus and independent of the Lx₃ locus. We propose that the dominant allele for this gene be called Lx₂ and the recessive null be designated lx₂. Seeds were identified that lacked both lipoxygenase-2 and -3, but none was found that lacked both lipoxygenase-1 and -2. The lx-₂ null-allele will be useful for investigating the effect of lipoxygenase-2 on the production of off-flavors during processing of soybean products.

Key Words: Glycine max (L.) Merr. • Electrophoresis • Seed quality • Flavor • Linolenic acid • Oxidation • Isozymes • Linkage

² Respectively, research associate and profesor of agronomy and research geneticist, USDA-ARS, Purdue Univ., West Lafayette, IN 47907

Received for publication April 5, 1985.