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Inheritance of a Second Major Gene for Resistance to Phytophthora Rot in Soybeans¹

The inheritance of another gene for resistance to Phytophthora megasperma Drechs. var. sojae Hildeb. in soybeans [Glycine max (L.) Merr.] was studied. This dominant gene, proposed as Rps₂, is found in the cultivars ‘CNS’ and derived strains. The results obtained indicated that Rps₂ is at a locus different from the Rps, rps², rps locus. It is suggested that the first locus should now be changed from Rps, rps², rps to Rps₁, rps₁², rps₁ to distinguish it from the second locus, Rps₂ rps₂, Rps₂ has given a high level of resistance to phytophthora rot in repeated field plantings under conditions favorable for development of the disease. Screening for Rps₂ is easily accomplished by growing plants in a liquid culture medium with the pathogen.

Key Words: Glycine max L. Merr. • Phytophthora megasperma Drechs. var. sojae Hildeb.

² Geneticist, Research Agronomist, and Plant Pathologist, ARS, USDA, Stoneville, MS 38776.

Received for publication August 6, 1973.

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