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

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Abstract
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.

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