Genetics of Resistance to Stripe Rust in Hard White Winter Wheat Cultivar Heyne

The hard white winter wheat cultivar 'Heyne' has good field resistance to stripe rust and has been used as a source of resistance in regional breeding programs. To elucidate the genetics of resistance, Heyne was crossed with the cultivar 'Lakin', which is moderately susceptible to stripe rust. A mapping population of 145 F6-derived recombinant inbred lines was developed and tested for three years in the field and three cycles in the greenhouse for adult plant resistance. Transgressive segregants were noted that were more resistant than Heyne or more susceptible than Lakin. The population was genotyped with a 9000 SNP Infinium assay and analyzed by Inclusive Composite Interval Mapping. Resistance quantitative trait loci (QTLs) were detected on chromosomes 1A, 2A, and 2B of Heyne and on 3A of Lakin. The QTL on chromosome 2A was identified as Yr17 derived from Triticum ventricosum. Although new races of stripe rust virulent on Yr17 have recently appeared, Heyne maintains adequate field resistance. SNP markers were identified that can be used for marker-assisted selection of the three new QTLs.