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Inheritance of Reduced Palmitic Acid Content in Seed Oil of Soybean

Dep. of Agronomy

D. N. Duvick and E. G. Hammond

Dep. of Food Technology, Iowa State Univ., Ames, IA 50011

*Corresponding author.

Reduction of the palmitic acid content of soybean [Glycine max (L.) Merr.] would lower the total saturated fatty acid content of the seed oil. A mutant line, A1937NMU-173, with 30 g kg^-1 less palmitic acid than commercial soybean cultivars was obtained by the treatment of seeds of the cultivar A1937 with N-nitroso-N-methyl-urea (NMU). To determine the genetic control of the reduced palmitic acid, A1937NMU-173 was crossed reciprocally to C1726, a line with the fap1 allele that lowers the palmitic acid content. No maternal effect for palmitic acid was observed from the analysis of F₁ seeds from reciprocal crosses. The segregation observed from the analysis of individual F₂ seeds for palmitic acid content satisfactorily fit a ratio of 9 greater than either parent: 2 within the range of the parents: 5 less tahn either parent. The F₂ segregation ratio and the segregation of F₃ seeds from F₂ plants indicated that A1937NMU-173 and C1726 have different alleles at two independent loci. The allele in A1937NMU-137 has temporarily been designed fapx. the genotype fap1 fap1 fapx fapx has g kg^-1 of palmitic acid, which is the lowest content known in soybean.

Received for publication February 26, 1990.

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