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Relationships between Rps2 and Other Genes Controlling Resistance to Phytophthora Rot in Soybean¹

The genes Rps4, Rps5, and Rps6 controlling resistance to phytophthora rot (caused by Phytophthora megasperma Drechs. f. sp. glycinea Kuan and Erwin) in soybean [Glycine mar (L.) Merr.] have recently been identified. Although tests for nonallelism with Rps1 and Rps3 were conducted, no investigation showing the relationship with Rps2 has been reported. The purpose of this study was to determine the relationship between Rps2 and Rps4, Rps5, and Rps6. The F₃ lines from crosses between Rps2 and Rps4, Rps5, and Rps6 types were grown hydroponically and challenged with zoospores of race 1 of the pathogen. The 151 segregation ratios indicated that Rps4, Rps5, and Rps6 are nonallelic to Rps2. Because the genes studied are at different loci, Rps2 could be combined with any of them to develop soybean cultivars with resistance to several races of the pathogen causing phytophthora rot.

Key Words: Glycine max (L.) Merr. • Phytophthora megasperma Drechs. f. glycinea • Hydroponics • Host-plant resistance

² Research geneticist, USDA-ARS, Stoneville, MS 38776.

Received for publication September 26, 1985.