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Title: Molecular mapping of genes conferring non-race specific and race-specific resistances to stripe rust in spring wheat cultivar Alpowa

Author
item LIN, F - WASHINGTON STATE UNIV
item Chen, Xianming

Submitted to: American Phytopathological Society Abstracts
Publication Type: Abstract Only
Publication Acceptance Date: 4/15/2006
Publication Date: 7/1/2007
Citation: Lin, F., Chen, X. 2007. Molecular mapping of genes conferring non-race specific and race-specific resistances to stripe rust in spring wheat cultivar Alpowa. American Phytopathological Society Abstracts, 7/28-8/02/07, San Diego, CA, 97:S169.

Interpretive Summary:

Technical Abstract: The spring wheat cultivar ‘Alpowa’ has both race-specific resistance and non-race specific high-temperature adult-plant (HTAP) resistance to stripe rust caused by Puccinia striiformis f. sp. tritici (PST). To identify and map genes for the resistances, 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 chromosome 1BS. 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 PST races virulent on seedlings of Alpowa and all-stages of AVS. QTL mapping identified a 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. The QTL was mapped on 7BL. The chromosome locations and different race reactions indicate that the two Alpowa genes have not been previously described.