Inheritance of Three Stearic Acid Mutants of Soybean
1985
Graef, G. L. | Fehr, W R | Hammond, E. G.
Three mutant lines of soybean [Glycine max (L.) Merrill] were identified that had three- to six-fold increases in stearic acid content in the seed oil compared with their parents. Our objective was to determine the inheritance of high stearic acid in the three mutants. Reciprocal crosses were made between each mutant and its parent and among the three mutants. Fatty acid analysis of the seed oil of the parents and the F₁, F₂, and F₃ generations indicated that high stearic acid in the mutants was controlled by a single locus. The Fas allele for low stearic acid in each parent was partially dominant to the allele for high stearic acid in the mutant derived from it. Crosses among the mutants indicated that each possessed a different allele at the same locus. The allele fasᵃ, in the mutant A6, and fas⁶, in the mutant FA41545, were not dominant to each other. Both fasᵃ and fasᵇ were completely dominant to thefas allele in the mutant A81-606085. None of the segregates from the mutant ✕ mutant crosses had a stearic acid content outside the range of the parents. Maternal and cytoplasmic effects were not important in the control of stearic acid content in these mutants.
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