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Low linolenate sources at the Fan locus in soybean lines M-5 and IL-8



Low linolenate sources at the Fan locus in soybean lines M-5 and IL-8



Breeding Science 46(2): 155-158



Reduction of linolenic acid content in soybean (Glycine max (L.) Merr.) oil is associated with improved odor and flavor characteristics. The mutant M-5 and line IL-8 used in this study were identified with linolenic acid contents (4.63% and 4.50%, respectively) half that of Bay (8.02%), but similar to that of C1640 (4.58%). The objective of this study was to determine the inheritance of low linolenic acid content in IL-8, and to determine the genetic relationships among alleles controlling linolenic acid in M-5, IL-8 and C1640. Reciprocal crosses were made among M-5, C1640, IL-8, and Bay. The F-2 segregation ratio and the segregation of F-3 seeds from F-2 plants of M-5 times Bay, C1640 times Bay, and IL-8 times Bay indicated that -M-5, C1640, and IL-8 have alleles at a single locus. The F-2 plants from the crosses of M-5 times IL-8, M-5 times C1640, and C1640 times IL-8, did not transgressively segregate indicating the low linolenic acid contents in M-5, IL-8, and C1640 were controlled by the same alleles. Therefore, the alleles in M-5, IL-8, and C1640 have been designated fan (M-5), fan (IL8), and fan (C1640), respectively.

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