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Inheritance of Lipoxygenase-1 Activity in Soybean Seeds¹

The objectives of this study were to determine the mode of inheritance of lipoxygenase-1 (L-I) activity in soybean [Glycine max (L.) Merr.] seeds and to investigate possible linkage of the L-1 locus with the Le (seed lectin), Sp_l (ß-amylase), and W₁ (flower color) loci. The inheritance of L-1 in soybean seeds was determined by crossing the two genotypes that lack L-l, Plant Introduction (P.I.) 133226 and P.I. 408251, with soybean cultivars (‘Williams,’ ‘Forrest,’ ‘Columbia,’ and ‘Altona’) having normal L-1 activity. All F₁ seeds had L-1 activity. F₂ seeds resulting from these crosses segregated 3:1 indicating that the presence of L-1 is inherited as a simple dominant. F₃ seeds from heterozygous F₂ plants also segregated 3:1. Reciprocal crosses gave the same results indicating no maternal or cytoplasmic effects on the inheritance of L-1 activity. The genesymbol Lx₁ is assigned to the allele coding for the presence of L-1 protein and lx for the lack a detectable L-1 protein. Linkage studies indicate that the Lx₁ locus is not linked to the loci coding for W, Le, or Sp₁.

Key Words: Glycine max (L.) Merr. • Flavor • Flower color • Lectin • Linkage • Lipid oxidation • ß-amylase

² Graduate research assistant and professor of plant genetics, respectively, Dep. of Agronomy, Univ. of Illinois.

Received for publication October 19, 1981.