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Wheat stem (or black) rust is one of the most devastating fungal diseases, threatening global wheat production. Identification, mapping, and deployment of effective resistance genes are critical to addressing this challenge. In this study, we mapped and characterized one stem rust resistance ( Sr ) gene from the tetraploid durum wheat variety Kronos (temporary designation  SrKN ). This gene was mapped on the long arm of chromosome 2B and confers resistance to multiple virulent  Pgt  races, such as TRTTF and BCCBC. Using a large mapping population (3,366 gametes), we mapped  SrKN  within a 0.29 cM region flanked by the sequenced-based markers  pku4856F2R2  and  pku4917F3R3 , which corresponds to 5.6- and 7.2-Mb regions in the Svevo and Chinese Spring reference genomes, respectively. Both regions include a cluster of nucleotide binding leucine-repeat (NLR) genes that likely includes the candidate gene. An allelism test failed to detect recombination between  SrKN  and the previously mapped  Sr9e  gene. This result, together with the similar seedling resistance responses and resistance profiles, suggested that  SrKN  and  Sr9e  may represent the same gene. We introgressed  SrKN  into common wheat and developed completely linked markers to accelerate its deployment in the wheat breeding programs.  SrKN  can be a valuable component of transgenic cassettes or gene pyramids that includes multiple resistance genes to control this devastating disease.

Mapping and Characterization of a Wheat Stem Rust Resistance Gene in Durum Wheat “Kronos”