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The Journal of Heredity 1999:90(3)
© 1999 The American Genetic Association 90:423-428

Brief communication. Genetic relationships between loci for palmitate contents in soybean mutants

SM Rahman, T Kinoshita, T Anai, and Y Takagi

Elevated palmitate content in soybean [Glycine max (L.)] oil may be important for the production of some food and industrial products. The palmitate content of commercial cultivars is approximately 11.0%. Soybean mutants with elevated and reduced palmitate have been developed. Elevated palmitate in J10 (-15.6%) and C1727 (-17.3%), and reduced palmitate in C1726 (-8.6%) were controlled by sop2, fap2, and fap1, respectively. The genetic system for elevated palmitate in KK7 (-13.5%) was unknown. Reciprocal crosses were made as Bay x J10, Bay x C1727, Bay x KK7, C1727 x J10, C1726 x J10, J10 x KK7, C1727 x KK7, and Cl 726 x KK7 to determine if thesop2 allele in J10 was different from fap2 and fap l, and if the allele in KK7 was different from those of sop2, fap2, and fap 1. No maternal effect was observed in any of the crosses. The phenotypic segregation ratio and the genotypic evaluation of F2 plants from C1726 x J10, J10 x KK7, C1727 x KK7, and Cl 726 x KK7 indicated that the sop2 allele in J 1 0 was at a different locus from fapl, and that the allele in KK7 was at a different locus from sop2, fap2, and fap1. The lack of transgressive segregation in F2 seeds and their F2 plants with putative lower and higher palmitate content of C1727 x J10 indicated that the sop2 allele was at the same locus as fap2, The sop2 allele in J10 was given the permanent designation of fap2 (J 1 0) and the allele in KK7 was temporarily designated fapx. Lines with the fap2fap2fapxfapx genotype may provide important sources of elevated palmitate in soybean seed oil.


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