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Stripe rust caused by  Puccinia striiformis  Westend. f. sp.  tritici  Erikks. is an economically important disease of wheat ( Triticum aestivum  L.). Hexaploid spring wheat landrace PI 480035 was highly resistant to stripe rust in the field in Washington during 2011 and 2012. The objective of this research was to identify quantitative trait loci (QTL) for stripe rust resistance in PI 480035. A spring wheat, “Avocet Susceptible” (AvS), was crossed with PI 480035 to develop a biparental population of 110 recombinant inbred lines (RIL). The population was evaluated in the field in 2013 and 2014 and seedling reactions were examined against three races (PSTv-14, PSTv-37, and PSTv-40) of the pathogen under controlled conditions. The population was genotyped with genotyping-by-sequencing and microsatellite markers across the whole wheat genome. A major QTL,  QYr . wrsggl1-1BS  was identified on chromosome 1B. The closest flanking markers were  Xgwm273 ,  Xgwm11 , and  Xbarc187  1.01 cM distal to  QYr . wrsggl1-1BS ,  Xcfd59  0.59 cM proximal and  XA365  3.19 cM proximal to  QYr . wrsggl1-1BS . Another QTL,  QYr . wrsggl1-3B , was identified on 3B, which was significant only for PSTv-40 and was not significant in the field, indicating it confers a race-specific resistance. Comparison with markers associated with previously reported  Yr  genes on 1B ( Yr64 ,  Yr65 , and  YrH52 ) indicated that  QYr . wrsggl1-1BS  is potentially a novel stripe rust resistance gene that can be incorporated into modern breeding materials, along with other all-stage and adult-plant resistance genes to develop cultivars that can provide durable resistance.

Mapping genes for resistance to stripe rust in spring wheat landrace PI 480035