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POSTERS: Genetics of Resistance I

P-285 - Stripe Rust resistance genes and QTL from two Pakistani wheat lines

Monday, August 4, 2025
3:45 PM - 4:30 PM HST
Location: Exhibit Hall 3
Abstract Text: Stripe rust is an important foliar fungal disease of wheat which is mainly managed with either specific fungicides found to mitigate disease or certain cultivars bred to tolerate disease. In this study, two biparental populations of Triticum aestivum were created and advanced to generation F7. Subsequently, these populations were challenged with Puccinia striiformis in greenhouse and field settings, genotyped, and mapped to identify relevant resistance genes and QTL. In the greenhouse setting, populations were challenged with single pathogen races, PSTV-52 and PSTV-53, and scored for infection type to find all stage resistance genes. In the field setting, populations were challenged with multiple pathogen races, naturally and artificially, and scored for infection type and disease severity to find all stage resistance and adult plant resistance genes. In one population, 2 all stage resistance genes were mapped to the short arms of 2A and 2B and 3 adult plant resistance QTL were mapped to the long arms of 1B and 3B and the short arm of 6B. In the other population, 1 all stage resistance gene was mapped to the short arm of 2A, 1 all stage resistance QTL was mapped to the long arm of 2B, and 3 adult plant resistance QTL were mapped to the short arms of 3B, 6B, and 7A. These results will enable continual marker assisted selection of new lines and breeding of improved cultivars.