1. Virulence variation ofPuccinia striiformisWestend. f. sp.triticiin Pakistan
- Author
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Attiq-ur-rehman, Javed Iqbal Mirza, Muhammad Ashraf, Ghulam Mustafa Sahi, Ahmad Iftikhar, Sumaira Rizwan, and Abdul Mujeeb Kazi
- Subjects
Veterinary medicine ,food and beverages ,Virulence ,Stripe rust ,Biology ,Plant disease resistance ,biology.organism_classification ,Rust ,Seedling ,Botany ,Genotype ,Puccinia striiformis ,Cultivar ,Agronomy and Crop Science - Abstract
Yellow rust populations of Pakistan were characterised for their virulence pathotypes/races and pathogenetic variation using seedling evaluation of differential genotypes under glasshouse conditions in Murree (6000 feet above sea level). Differential genotypes comprised a world set, an European set, near isogenic lines and the universally susceptible bread wheat cultivar “Morocco”. Over the two-year study a total of 18 race groups were identified. Out of these 18 race groups, several (68E0, 64E0, 66E0, 70E0, 6E0, 71E0, 6E0, 2E0, 67E0, and 68E16) were found previously. The new race group 70E32 found probably evolved because of mutation from the previously existing 70E16. Virulence frequencies of yellow rust (Yr) resistance genes were also determined on near isogenic lines. The highest virulence frequencies (%) were found for Yr7 (88%), Yr9 (57%), Yr18 (70%), and Yr24 (69%). Virulence frequencies were low for Yr 1 (4%), Yr5 (7%), Yr10 (10%) and Yr15 (4%). Our studies indicated that virulence existed for alm...
- Published
- 2010
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