Two kinds of “group A saponin,” Aa and Ab, are present as the main constituent in soybean seed. The saponin composition and content in F1 and F2 seeds derived from the cross parents of Aa and Ab types were analyzed. The “group A saponin” was of Aa–Ab type in all the F1 seeds, and the ratio of Aa type : Aa–Ab type : Ab type was 1:2:1 in the F2 seeds. From these results, it appears that Aa and Ab were controlled by codominant allelic alternatives at a single locus. An investigation of the saponin composition of the seed hypocotyls of 18 wild lines revealed some lines in which “group A saponin” was absent.
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Shiraiwa et al. (1990) studied this question.