| Institution: | 1.Swift Current Research and Development Center,Agriculture and Agri-Food Canada,Swift Current,Canada;2.Lethbridge Research and Development Center,Agriculture and Agri-Food Canada,Lethbridge,Canada;3.Morden Research and Development Centre,Agriculture and Agri-Food Canada,Morden,Canada;4.Advancing Wheat Technologies,Swift Current,Canada;5.Department of Agronomy,Iowa State University,Ames,USA;6.National Research Council of Canada,Saskatoon,Canada;7.Department of Plant Sciences,University of Saskatchewan,Saskatoon,Canada;8.Plant and Food Research Canterbury Agriculture and Science Centre,Lincoln,New Zealand;9.International Maize and Wheat Improvement Center (CIMMYT),Mexico,Mexico;10.Campo Experimental Valle de México INIFAP,Chapingo,Mexico;11.International Maize and Wheat Improvement Center (CIMMYT),Nairobi,Kenya |
| Abstract: | Key message Quantitative trait loci controlling stripe rust resistance were identified in adapted Canadian spring wheat cultivars providing opportunity for breeders to stack loci using marker-assisted breeding. AbstractStripe rust or yellow rust, caused by Puccinia striiformis Westend. f. sp. tritici Erikss., is a devastating disease of common wheat (Triticum aestivum L.) in many regions of the world. The objectives of this research were to identify and map quantitative trait loci (QTL) associated with stripe rust resistance in adapted Canadian spring wheat cultivars that are effective globally, and investigate opportunities for stacking resistance. Doubled haploid (DH) populations from the crosses Vesper/Lillian, Vesper/Stettler, Carberry/Vesper, Stettler/Red Fife and Carberry/AC Cadillac were phenotyped for stripe rust severity and infection response in field nurseries in Canada (Lethbridge and Swift Current), New Zealand (Lincoln), Mexico (Toluca) and Kenya (Njoro), and genotyped with SNP markers. Six QTL for stripe rust resistance in the population of Vesper/Lillian, five in Vesper/Stettler, seven in Stettler/Red Fife, four in Carberry/Vesper and nine in Carberry/AC Cadillac were identified. Lillian contributed stripe rust resistance QTL on chromosomes 4B, 5A, 6B and 7D, AC Cadillac on 2A, 2B, 3B and 5B, Carberry on 1A, 1B, 4A, 4B, 7A and 7D, Stettler on 1A, 2A, 3D, 4A, 5B and 6A, Red Fife on 2D, 3B and 4B, and Vesper on 1B, 2B and 7A. QTL on 1A, 1B, 2A, 2B, 3B, 4A, 4B, 5B, 7A and 7D were observed in multiple parents. The populations are compelling sources of recombination of many stripe rust resistance QTL for stacking disease resistance. Gene pyramiding should be possible with little chance of linkage drag of detrimental genes as the source parents were mostly adapted cultivars widely grown in Canada. |
