Stripe rust, caused by Puccinia striiformis f. sp. tritici (Pst), is a devastating foliar disease of wheat. Deployment of resistant wheat cultivars is one of the best strategies to mitigate disease associated risks. The wheat germplasm line P2711 possesses effective stripe rust resistance under field conditions, however, the genetic basis of this resistance is unknown. To identify quantitative trait loci (QTLs) for stripe rust resistance, a recombinant inbred line (RIL) population comprised of 252 individuals was developed from the cross AAC Cameron/P2711. This population was evaluated for stripe rust severity at the adult plant stage at the nurseries in Creston, British Columbia (in 2018, 2019 and 2020) and Lethbridge, Alberta (in 2018 and 2020), and was genotyped using the wheat 90K Infinium iSelect SNP assay. A high-density genetic map comprised of 8,914 SNP markers was constructed covering all the wheat chromosomes. Four resistance alleles were contributed by the male parent P2711 and three from the female parent AAC Cameron. QYr.lrdc-2A.1, corresponding to the Yr17 gene, was the most stable QTL and detected in four out of five environments, whereas QYr.lrdc-2B was the second most stable QTL. These two QTL along with QYr.lrdc-5A showed a significant reduction in stripe rust severity when present together. Except for QYr.lrdc-2A.1 and QYr.lrdc-2B, all other QTL were location specific. Stable QTLs on chromosome 2A and 2B, and their closely associated markers identified in this study could be utilized in marker assisted selection for stripe rust resistant cultivar development.
