Inheritance of Reduced Palmitic Acid Content in Seed Oil of Soybean
1991
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.
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