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Soybean rust, caused by the fungal pathogen  Phakopsora pachyrhizi , is an economically significant disease for soybean ( Glycine max  (L.) Merr.) production throughout the world. Genes for resistance to  P. pachyrhizi  ( Rpp ) have been identified at multiple loci in the soybean genome, but each conditions resistance to specific  P. pachyrhizi  isolates rather than providing broad resistance to the species. Identifying soybean cultivars with previously unidentified  Rpp  genes, combined with efforts to breed soybean containing multiple  Rpp  genes, is a key part of the ongoing strategy to manage the disease and minimize its economic impact. Fifty-three soybean genotypes, possessing known and unknown  Rpp  genes, were challenged with 16  P. pachyrhizi  isolates from a global collection. The observed phenotypic reaction patterns provided insight into the presence of  Rpp  genes. This study tentatively confirms the presence of  Rpp1b , or an allele, in eight soybean lines, of previously unknown resistance gene, and in another three lines produced by targeted breeding. Examples of resistance gene pyramiding were identified in lines 4014–242-341 and 4018-4-1-1-212, which may contain both  Rpp2  and  Rpp4  genes and line RN6-313-362, which may contain both  Rpp1b  and  Rpp4 . Three possible sources of new resistance genes may exist within GC00138-29, PI 567145 C, and PI 605833. This study provides preliminary information on potential new sources of soybean-rust-resistance that may be used to focus specific future research and inform breeding programs.

Phenotypic reactions of 53 soybean genotypes to infection with each of 16 isolates of Phakopsora pachyrhizi