Evaluation of 7S β-subunit deficiency and its inheritance among soybeans Glycine max L. in the Mekong Delta, Viet Nam

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One soybean accession, F5-3 introduced from INSOY (1985), as a reduced β-subunit mutant of 7S conglycinin was screened out of 620 soybean accessions by using SDS-PAGE. This accession was crossed with two leading high yielding varieties, MTD65 and MTD176, in Viet Nam for evaluation of β-subunit inheritance patterns. Results of Chi-square analysis showed that the β-subunit of cross I (MTD65 x F5-3) was controlled not only by one gene as complete dominance (3:1) and incomplete dominance (1:2:1) types, but also by two interacting genes (9:3:4). However, the β-subunit of cross II (MTD176 x F5-3) did not fit any of the inheritance patterns mentioned above. A new inheritance pattern, involving crossing-over between two incompletely linked genes on the same chromosome, was proposed. Results from analyses of F_1 and backcross seeds also confirmed this new genetic pattern. An additional new gene symbol for the β-subunit was suggested, with dominant genes expressed as Cgy3a and Cgy3b, and recessive genes as cgy3a and cgy3b. Propagation of F_3 seeds of the two crosses are continuing, in order to provide pure lines for future molecular research and for soybean breeding.
野生生物保護学会の論文