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Identification of a soybean rust resistance gene in PI 567104B

Liu, Min, Li, Shuxian, Swaminathan, Sivakumar, Sahu, Binod B., Leandro, Leonor F., Cardinal, Andrea J., Bhattacharyya, Madan K., Song, Qijian, Walker, David R., Cianzio, Silvia R.
Theoretical and applied genetics 2016 pp. 1-15
Glycine max, Phakopsora pachyrhizi, alleles, chromosome mapping, crop management, crossing, cultivars, disease resistance, fungi, fungicides, genetic markers, growth chambers, inbred lines, introduced plants, loci, microsatellite repeats, parents, pesticide application, seeds, soybean rust, Mississippi
Asian soybean rust (SBR), caused by the fungus Phakopsora pachyrhizi Syd. & P. Syd., is one of the most economically important diseases that affect soybean production worldwide. A long-term strategy for minimizing the effects of SBR is the development of genetically resistant cultivars integrated with judicious fungicide application to facilitate crop management and protect the environment. The objectives of this study were to map the SBR resistance (Rpp) gene in plant introduction (PI) 567104B and to compare its genomic location with the locations of previously mapped Rpp genes. Using reaction data from field assays of the F2:3 and F4:5 generations from a cross of ‘IAR 2001 BSR’ × PI 567104B, and from a growth chamber assay in which 253 F5:6 recombinant inbred lines (RILs) from the cross were later phenotyped following inoculation with a purified 2006 isolates from Mississippi, a resistance gene locus was mapped to a region containing the Rpp6 locus on chromosome 18. The high level of resistance of F1 seeds from two other crosses in which PI 567104B was used as one of the parents indicated that the gene from PI 567104B was dominant. The interval containing the gene is flanked by the simple sequence repeat (SSR) markers Satt131 and Satt394, and includes the SSR markers BARCSOYSSR_18_0331 and BARCSOYSSR_18_0380. Additional research is needed to investigate the degree of relationship between the allele from PI 567104B and the Rpp6 gene from PI 567102B.