Title: Molecular mapping of genes conferring non-race specific and race-specific resistances to stripe rust in spring wheat cultivar Alpowa Authors
|Lin, F - WASHINGTON STATE UNIV|
Submitted to: National American Phytopathology Meetings
Publication Type: Abstract Only
Publication Acceptance Date: June 1, 2006
Publication Date: July 1, 2006
Citation: Lin, F., Chen, X. 2006. Molecular mapping of genes conferring non-race specific and race-specific resistances to stripe rust in spring wheat cultivar Alpowa. APS Pacific Division Mtg, June 13-1, Boise, ID. Phytopathology 97:S169. Technical Abstract: The spring wheat cultivar ‘Alpowa’ has high-temperature, adult-plant (HTAP) resistance to stripe rust caused by Puccinia striiformis f. sp. tritici. The resistance is non-race specific and durable. To identify and map stripe rust resistance genes, Alpowa was crossed with ‘Avocet Susceptible’ (AVS). In the tests of seedlings under controlled greenhouse conditions with 15 races of the pathogen, AVS was susceptible to all races and Alpowa was resistant to only PST-1 and PST-21. One partially dominant gene was identified from tests of the parents, F1, F2, and F3 progeny of the cross inoculated with PST-1. This gene was mapped on the short arm of chromosome 1B and has a genetic distance of 2.8 cM away from Yr15 and 12.4 cM away from YrH52. To map the quantitative trait loci (QTL) for the HTAP resistance, parents and 136 F3 lines were tested in three locations in eastern and western Washington under natural infection of wheat stripe rust races virulent on seedlings of Alpowa and all-stages of AVS. QTL mapping identified a major QTL that explained 54.8% of the total variation based on the relative area under disease progress curve data and 48.9% of the total infection type variation. This QTL was mapped on the long arm of chromosome 7B. The chromosome location and the non-race specific nature of HTAP resistance indicate that the QTL has not been previously described.