A New Major Gene for Resistance toPhytophthora megaspermavar.sojaein Soybean

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Abstract
The inheritance of resistance to P. megasperma var. sojae was studied in the F2 and F3 from crosses of the soybean plant introduction (PI) 86050 with ''Harosoy'' (rps1 rps3), ''Mukden'' (Rps1 rps3), PI 84637 (Rps1b rps3), PI 54615-1 (Rps1c rps3), PI 86972-1 (rps1 Rps3), and ''Altona''. PI 86050 has 2 genes for resistance to races 1, 2 and 3; 1 gene for resistance to races 4, 6, 7, 8 and 9; and no gene for resistance to race 5. One of the genes in PI 86050 is Rps1c which conveys resistance to races 1, 2, 3, 6, 7, 8 and 9. The other gene conveys resistance to races 1, 2, 3 and 4. The symbol Rps4 is proposed for this gene. Rps4 is not at the same locus as the allele in ''Altona'' which also controls resistance to races 1, 2, 3 and 4.