95-24 Multi-Environment Quantitative Trait Loci Analysis for Resistance to Stripe Rust and Cephalosporium Stripe in Two Recombinant Inbred Line Populations.

Poster Number 433

See more from this Division: C01 Crop Breeding & Genetics
See more from this Session: Div. C01 Graduate Student Poster Competition
Monday, October 22, 2012
Duke Energy Convention Center, Exhibit Hall AB, Level 1
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Maria Dolores Vazquez1, Robert Zemetra1, Adam Heesacker1, Xianming Chen2 and Chris Mundt3, (1)Crop Science Department, Oregon State University, Corvallis, OR
(2)Department of Plant Pathology, USDA-ARS and Washington State University, Pullman, WA
(3)Department of Botany & Plant Pathology, Oregon State University, Corvallis, OR
˙ūStripe rust (Puccinia striiformis) and Cephalosporium stripe (Cephalosporium gramineum) can cause severe yield and grain quality loss of wheat (Triticum aestivum L.) in the Pacific Northwest, USA. Favorable weather conditions and the appearance of new races are becoming an important factor for annual development of stripe rust disease in the region. Cephalosporium stripe can be a limiting factor in the adoption of conservation tillage practices and little is known about the inheritance of resistance. Two recombinant inbred lines (RILs) populations (Einstein x Tubbs and Tubbs x NSA 95-0995) were assessed for quantitative trait loci (QTL) analysis to stripe rust and Cephalosporium stripe. A linkage map was created for each population based on diversity array technology (DArT) and simple sequence repeat (SSR) markers. Field screenings for stripe rust on both populations were done in six environments under natural inoculation. Field screenings for Cephalosporium stripe under artificially inoculated conditions and based on whiteheads (sterile heads caused by pathogen infection) were done in four environments for the Einstein x Tubbs population and in three environments for the Tubbs x NSA 95-0995 population. Results from the QTL analysis identified common regions associated with resistance to stripe rust and Cephalosporium stripe. In addition, asociation mapping in 64 lines from the Pacific Northwest USA is performed to validate results from the QTL analysis.
See more from this Division: C01 Crop Breeding & Genetics
See more from this Session: Div. C01 Graduate Student Poster Competition