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The  Phytophtora  root and stem rot is a serious disease in soybean. It is caused by the oomycete pathogen  Phytophthora sojae . Growing  Phytophthora  resistant cultivars is the major method of controlling this disease. Resistance is race- or gene-specific; a single gene confers immunity against only a subset of the  P. sojae  isolates. Unfortunately, rapid evolution of new  Phytophthora sojae  virulent pathotypes limits the effectiveness of an  Rps  (“resistance to  Phytophthora sojae ”) gene to 8–15 years. The current study was designed to investigate the effectiveness of  Rps12  against a set of  P. sojae  isolates using recombinant inbred lines (RILs) that contain recombination break points in the  Rps12  region. Our study revealed a unique  Rps  gene linked to the  Rps12  locus. We named this novel gene as  Rps13  that confers resistance against  P. sojae  isolate V13, which is virulent to recombinants that contains  Rps12  but lack  Rps13 . The genetic distance between the two  Rps  genes is 4 cM. Our study revealed that two tightly linked functional  Rps  genes with distinct race-specificity provide broad-spectrum resistance in soybean. We report here the molecular markers for incorporating the broad-spectrum  Phytophthora  resistance conferred by the two  Rps  genes in commercial soybean cultivars.

Tightly linked Rps12 and Rps13 genes provide broad-spectrum Phytophthora resistance in soybean