Mapping quantitative trait loci associated with stripe rust resistance from the Canadian wheat cultivar ‘AAC Innova’

Stripe rust, caused by Puccinia striiformis Westend. f.sp. tritici Erikss. (Pst), is one of the most devastating diseases wheat (Triticum aestivum L.) globally. Exploring and utilizing new sources resistance essential for breeding resistant cultivars. Thus, a doubled haploid population (n = 291) derived from cross ‘AAC Innova’/‘AAC Proclaim’ was evaluated to dissect genetics in cultivar Innova’. This stripe rust severity disease nurseries at Creston, British Columbia (in 2016 2020), Lethbridge, Alberta 2016, 2017 genotyped using 90 K SNP assay. A high-density genetic map constructed which consisted 7112 markers with an average marker interval 2.3 cM. Quantitative trait loci (QTL) mapping identified major (QYr.lrdc-2A) 10 minor effect (QYr.lrdc-2B.1, QYr.lrdc-2B.2, QYr.lrdc-2B.3, QYr.lrdc-2B.4, QYr.lrdc-2D, QYr.lrdc-3B, QYr.lrdc-5A, QYr.lrdc-5B, QYr.lrdc-5D QYr.lrdc-7D) loci. The QTL QYr.lrdc-2A consistently effective against Pst races across all environments explained up 33.0% phenotypic variation. Other QTLs were either less consistent or environment specific. Innova’ contributed alleles except QYr.lrdc-5A QYr.lrdc-7D. this study should be valuable diversifying current virulent Pst. In particular, Innova’-derived could source incorporate into commercial cultivars combine other genes associated study.