A new soybean (Glycine max) allele, Rps1-d, for resistance to Phytophthora megasperma f. sp. glycinea was identified. A backcross-derived Rps1-d isogenic line of Harosoy, HARO 16, gave resistant reactions to races 1-7, 9-11, 13-16, 18, 21-22, 24, and 25 and susceptible reactions to races 8, 12, 17, and 19, the same as PI 103091, the source of Rps1-d
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R. I. Buzzell (1992) studied this question.