A Major Gene for Resistance to Seed Coat Mottling in Soybean1

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Abstract
Four soybean varieties were grown in a date‐of‐planting study (12 dates) at St. Paul, Minnesota, and the effect of planting date on seed coat mottling was observed. At the same location, segregation for seed coat mottling was recorded in the F2 and F3 generations of a cross between ‘Merit’ (nonmottled) and ‘Harosoy’ (mottled). Three of the four varieties, ‘Acme’, ‘Chippewa,’ and ‘Harosoy’ showed increased amounts of mottling as the planting date was delayed. Merit, however, remained completely free of mottling at all twelve planting dates, which suggested that Merit was immune to seed coat mottling. The F2 and F3 segregation for mottling in the Merit ✕ Harosoy cross indicated that resistance to mottling was controlled by a single gene, designated as Im, which exhibited partial to complete dominance when grown in an environment favoring the expression of this trait.

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