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Genetics of Resistance to Phytophthora Rot in Soybean Cultivar PI 171442¹

The genetics of resistance to phytophthora rot (caused by Phytophthora megasperma Drechs. var. sojae Hildeb.) was studied in the soybean [Glycine max (L.) Merr.] cultivar PI 171442. PI 171442 is the donor of one of the genes for resistance in the cultivar ‘Tracy,’ and is part of a uniform set of soybean differentials used to identify races of the disease-inducing organism. The results indicate that the dominant gene found in PI 171442 occupies a locus different from Rps₁ and Rps₂, and that both PI 171442 and PI 86972-1 have the Rps₃ gene for resistance.

Key Words: Allelomorphic series • Gene • Glycine max (L.) Merr. • Physiologic races • Soybean disease • Phytophthora megasperma Drechs. var. sojae Hilded

² Geneticist and plant pathologist, USDA-SEA-AR, Stoneville, MS 38776.

Received for publication March 20, 1981.