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Heritability of Purple Seed Stain Resistance in Soybeans¹

Soybean [Glycine max (L.) Merr.] plants in the F₂, F₃, and F₄ generations from the cross ‘Amsoy’ x PI 80837 were inoculated with Cercospora kikuchii (Matsumoto and Tomoyasu) Gardner, the causal organism of purple seed stain. Incidence of purple seed stain averaged 84.3, 28.4, and 85.7% on Amsoy and 2.8, 0.2, and 2.3% on PI 80837 during the 3 years of the test. Heritabilities for disease incidence were 0.91 in the F₂ and 0.51 in the F₃ generations. Predicted response to selection closely approximated observed gains, when the most resistant 10% of the plants in each generation were evaluated in the next generation. Since the disease has not been shown to adversely affect agronomic characteristics, selection against extreme susceptibility seems more appropriate than intensive selection for a high level of resistance to the disease.

Key Words: Glycine max (L.) Merr. • Seed quality • Disease resistance • Response to selection • Cercospora kikuchii

² Cooperative investigations of the ARS, USDA, and Purdue Univ. Agric Exp. Stn. Journal paper No. 5673 of the Purdue Univ. Agric. Exp. Stn. and Publication No. 788 of the U.S. Regional Soybean Lab.

³ Associate professor of plant pathology, Purdue Univ., W. Lafayette, IN 47907.

Received for publication January 9, 1975.

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