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Winter wheat Druchamp has both high-temperature adult-plant (HTAP) resistance and all-stage resistance to stripe rust caused by  Puccinia striiformis  f. sp.  tritici  ( Pst ). The HTAP resistance in Druchamp is durable as the variety has been resistant in adult-plant stage since it was introduced from France to the United States in late 1940s. To map the quantitative trait loci (QTL) for stripe rust resistance, an F 8  recombinant inbred line (RIL) population from cross Druchamp × Michigan Amber was phenotyped for stripe rust response in multiple years in fields under natural infection and with selected  Pst  races under controlled greenhouse conditions, and genotyped with simple sequence repeat (SSR) and single nucleotide polymorphism (SNP) markers. Composite interval mapping (CIM) identified eight HTAP resistance QTL and three all-stage resistance QTL. Among the eight HTAP resistance QTL,  QYrdr . wgp-1BL . 2  (explaining 2.36-31.04% variation),  QYrdr . wgp-2BL  (2.81–15.65%),  QYrdr . wgp-5AL  (2.27–17.22%) and  QYrdr . wgp-5BL . 2  (2.42–15.13%) were significant in all tests; and  QYrdr . wgp-1BL . 1  (1.94–10.19%),  QYrdr . wgp-1DS  (2.04–27.24%),  QYrdr . wgp-3AL  (1.78–13.85%) and  QYrdr . wgp-6BL . 2  (1.69–33.71%) were significant in some of the tests. The three all-stage resistance QTL,  QYrdr . wgp-5BL . 1  (5.47–36.04%),  QYrdr . wgp-5DL  (9.27–11.94%) and  QYrdr . wgp-6BL . 1  (13.07-20.36%), were detected based on reactions in the seedlings tested with certain  Pst  races. Among the eleven QTL detected in Druchamp, at least three ( QYrdr . wgp-5DL  for race-specific all-stage resistance and  QYrdr . wgp-3AL  and  QYrdr . wgp-6BL . 2  for race non-specific HTAP resistance) are new. All these QTL, especially those for durable HTAP resistance, and their closely linked molecular markers could be useful for developing wheat cultivars with durable resistance to stripe rust.

Mapping a Large Number of QTL for Durable Resistance to Stripe Rust in Winter Wheat Druchamp Using SSR and SNP Markers