EVALUATION OF SOME LINES SELECTED FROM BREAD WHEAT LANDRACES FOR THEIR REACTION TO YELLOW (STRIPE) RUST
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This research was conducted to determine reactions of 200 pure lines selected from among the bread wheat landraces collected from 18 provinces and 7 regions of Turkey to yellow (stripe) rust (YR) at seedling and adult stages. Seedling reactions were studied in greenhouse conditions at the Central Research Institute of Field Crops in Ankara against two YR isolates and adult plant reactions were determined under natural or artificially developed disease epidemics in field conditions in Ankara, canakkale, Bingol, Kahramanmaras and Edirne locations over three cropping seasons of 2011-12, 2012-13 and 2013-14. For seedling stage reactions, urediniospores of two YR isolates representing populations in Ankara location were inoculated in mineral oil suspension. The test materials were incubated first at 9+1 degrees C with 100% humidity for 24 hours after inoculation. For adult plant stage reactions, the test materials were screened under natural or artificial developed disease conditions. For this, materials were sown in one-meter rows with two replications. YR severity on each entry was scored using the internationally recognized Modified Cobb scale when the cv. Little Club reached 80-100S. From the scores, Coefficients of Infections (CI) were calculated and values below 20 were considered to be resistant. As a result of the seedling stage and adult plant stage assessments over three years in five locations indicated that, 4 lines showed high level of resistance to YR. These landrace genotypes resistant to YR have been incorporated into breeding programs to be used as resistance sources against YR.