An Rps allele in the Harosoy cultivar of soybean (Glycine max) for resistance to races 16, 18, and 19 of Phytophthora megasperma f. sp. glycinea was shown to be at a new locus, designated Rps7, which is linked 12.5±2.7 map units from Rps1 in Linkage Group 10
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Terry Anderson (1992) studied this question.