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Resistance

Rps₆, a Major Gene for Resistance to Phytophthora megasperma f. sp. glycinea in Soybean. K. L. Athow, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907; F. A. Laviolette, Department of Botany and Plant Pathology, Purdue University, West Lafayette, IN 47907. Phytopathology 72:1564-1567. Accepted for publication 28 July 1982. Copyright 1982 The American Phytopathological Society. DOI: 10.1094/Phyto-72-1564.

The inheritance of resistance to Phytophthora megasperma f. sp. glycinea was studied in the F₂ and F₃ generations from crosses of the soybean cultivar Altona with Harosoy, Mukden, Sanga, PI 54615-1, Williams 82, PI 86972-1, and PI 86050. The data indicate that Altona has a single dominant gene for resistance to races 1–4. The symbol Rps₆ is proposed for this gene. The action of Rps₆ is similar to that of Rps₄ except that it conditions susceptibility to race 13, whereas Rps₄ conditions resistance.