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Sources and Inheritance of Resistance to Phytophthora megasperma var. sojae in Soybeans

Inheritance of resistance to Phytophthora megasperma var. sojae in soybeans was studied in a group of crosses involving nine resistant varieties, originally from fairly diverse geographical areas. Each of eight resistant varieties was crossed to the ninth, ‘Mukden,’ or one of its resistant backcross derivatives (‘Lindarin 63’ or ‘Clark 63’), and seven also were crossed to the susceptible varieties ‘Wabash,’ ‘Lindarin,’ or ‘Clark.’ From inoculation tests performed on F₃ progenies of F₂ plants of crosses between susceptible x resistant parents, monohybrid segregations were obtained, indicating that the resistance to phytophthora rot of soybeans is conditioned by a single dominant gene in each case. Inoculation tests on F₂ populations of crosses between resistant parents gave no segregation, suggesting that all resistant parents have Mukden-type resistance reported by Bernard et al. (1) and assigned the gene Rps (formerly Ps).

Key Words: Glycine Max • Phytophthorarot • Disease Resistance

² Formerly participant of the graduate training program of the Agency for International Development; Research Agronomist, Crops Research Division, ARS, USDA, and Professor of Agronomy, Purdue University; and Professors of Plant Pathology, Purdue University, Lafayette, Ind. 47907, respectively.

Received for publication November 8, 1967.