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Phytophthora sojae  Kaufmann and Gerdemann, which causes  Phytophthora  root rot, is a widespread pathogen that limits soybean production worldwide. Development of  Phytophthora  resistant cultivars carrying  Phytophthora  resistance  Rps  genes is a cost-effective approach in controlling this disease. For this mapping study of a novel  Rps  gene, 290 recombinant inbred lines (RILs) (F 7  families) were developed by crossing the  P .  sojae  resistant cultivar PI399036 with the  P .  sojae  susceptible AR2 line, and were phenotyped for responses to a mixture of three  P .  sojae  isolates that overcome most of the known  Rps  genes. Of these 290 RILs, 130 were homozygous resistant, 12 heterzygous and segregating for  Phytophthora  resistance, and 148 were recessive homozygous and susceptible. From this population, 59 RILs homozygous for  Phytophthora sojae  resistance and 61 susceptible to a mixture of  P .  sojae  isolates R17 and Val12-11 or P7074 that overcome resistance encoded by known  Rps  genes mapped to Chromosome 18 were selected for mapping novel  Rps  gene. A single gene accounted for the 1:1 segregation of resistance and susceptibility among the RILs. The gene encoding the  Phytophthora  resistance mapped to a 5.8 cM interval between the SSR markers BARCSOYSSR_18_1840 and Sat_064 located in the lower arm of Chromosome 18. The gene is mapped 2.2 cM proximal to the  NBSRps4/6 -like sequence that was reported to co-segregate with the  Phytophthora  resistance genes  Rps4  and  Rps6 . The gene is mapped to a highly recombinogenic, gene-rich genomic region carrying several nucleotide binding site-leucine rich repeat (NBS-LRR)-like genes. We named this novel gene as  Rps12 , which is expected to be an invaluable resource in breeding soybeans for  Phytophthora  resistance.

A Novel Phytophthora sojae Resistance Rps12 Gene Mapped to a Genomic Region That Contains Several Rps Genes