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Discovery of a seventh Rpp soybean rust resistance locus in soybean accession PI 605823

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Abstract

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A novel Rpp gene from PI 605823 for resistance to Phakopsora pachyrhizi was mapped on chromosome 19.

Abstract

Soybean rust, caused by the obligate biotrophic fungal pathogen Phakopsora pachyrhizi Syd. & P. Syd, is a disease threat to soybean production in regions of the world with mild winters. Host plant resistance conditioned by resistance to P. pachyrhizi (Rpp) genes has been found in numerous soybean accessions, and at least 10 Rpp genes or alleles have been mapped to six genetic loci. Identifying additional disease-resistance genes will facilitate development of soybean cultivars with durable resistance. PI 605823, a plant introduction from Vietnam, was previously identified as resistant to US populations of P. pachyrhizi in greenhouse and field trials. In this study, bulked segregant analysis using an F2 population derived from ‘Williams 82’ × PI 605823 identified a genomic region associated with resistance to P. pachyrhizi isolate GA12, which had been collected in the US State of Georgia in 2012. To further map the resistance locus, linkage mapping was carried out using single-nucleotide polymorphism markers and phenotypic data from greenhouse assays with an F2:3 population derived from Williams 82 × PI 605823 and an F4:5 population derived from ‘5601T’ × PI 605823. A novel resistance gene, Rpp7, was mapped to a 154-kb interval (Gm19: 39,462,291–39,616,643 Glyma.Wm82.a2) on chromosome 19 that is different from the genomic locations of any previously reported Rpp genes. This new gene could be incorporated into elite breeding lines to help provide more durable resistance to soybean rust.

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Acknowledgements

Special thanks to Justin Vaughn for the assistance with haplotype analysis and suggestions regarding the dendrogram and BSA figures. Technical support was provided by Dale Wood, Earl Baxter, Gina Bishop, Tatyana Nienow, Carol Picard, and David Spradlin of the University of Georgia. Technical assistance for screening soybean accessions at the USDA-ARS FDWSRU at Ft. Detrick, Maryland was provided by Amy Ruck. Funding for this research was partially provided by the United Soybean Board and the United States Department of Agriculture-Agricultural Research Service. Mention of trade names or commercial products in this publication is solely for the purpose of providing specific information and does not imply recommendation or endorsement by the US Department of Agriculture. USDA is an equal opportunity provider and employer.

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Childs, S.P., King, Z.R., Walker, D.R. et al. Discovery of a seventh Rpp soybean rust resistance locus in soybean accession PI 605823. Theor Appl Genet 131, 27–41 (2018). https://doi.org/10.1007/s00122-017-2983-4

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