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Effect of Gene Rps₁ for Resistance to Phytophthora Rot on Yield and Other Characteristics of Soybean¹

Two experiments were conducted to measure the effect of gene Rps₁, on seed yield and seven other agronomic traits by comparing closely related soybean [Glycine max (L.) Merr.] lines differing in resistance and susceptibility to Phytophthora megasperma f. sp. glycinea, Kuan and Erwin, in environments where the disease was not evident. In Exp. 1, seven resistant (Rps₁ Rps₁) and seven susceptible ((rps₁, rps₁) lines from each of six crosses were grown in replicated field tests near Morris, Rosemount, and Waseca, MN in 1975 and 1976. In Exp. 2, six pairs of nearisogenic lines, differing in Phytophthora reaction within each pair, from each of the third, fourth, and fifth generations of a backcross program were grown in replicated field tests near Rosemount and Waseca in 1976. On the basis of means representing 630 observations in Exp. 1 and 108 observations in Exp. 2, we concluded that resistant and susceptible lines were not significantly different for maturity, lodging, plant height, seed yield, seed quality, seed size, seed protein, or seed oil in either experiment. There was no convincing evidence of any genetic association between the Rps₁, gene and any of the agronomic traits studied.

Key Words: Glycine max (L.) Merr. • Phytophthora megasperma f sp. glycinea • Disease resistance • Isolines

² Formerly graduate student, Univ. of Minnesota, presently associate professor, Dep. of Plant Breeding, Bihar Agric. Col, Rajendra univ., Sabour, Bhgalpur, India; and professor emeritus, Dep. of Agronomy and Plant Genetics, Univ. of Minnesota, St. Paul, MN 55108.

Received for publication April 16, 1984.

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