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Evaluation of Different Wheat Genotypes Reaction to Stripe Rust (Puccinia striiformis f.sp. tritici) under Field Conditions in Ardabil Province

Khiavi HK, Mirak AA, Akrami M and Khoshvaghtei H

In order to assess the reaction of different wheat genotypes to 134E134A+ race of yellow rust at adult plant stage, 100 wheat genotypes were evaluated at Ardabil and Moghan under field and mist irrigation conditions. Infection type was recorded at flag leaf stage when disease appeared in susceptible genotypes (infection of around 80%). Disease severity on leaves was evaluated by Modified Cobb’s Scale in which 0: immune, 0%-5%: resistant, 5%-10%: moderately resistant, 10%-30%: moderately susceptible, more than 30%: highly susceptible. Mean coefficient of infection and mean area under disease progress curve (AUDPC) of flag leaf were calculated in each region separately. Analysis of variance indicated significant difference between genotypes for all traits. Results of this experiment according to coefficient of infection indicated that in Ardabil area, 1% of the genotypes were Immune, 29% were resistant, 52% were moderately resistant and 18% were susceptible. In Moghan area 25% of the genotypes were Immune, 59% were moderately resistant and 16% were susceptible to yellow rust disease. Cluster analysis based on infection type characteristics, disease severity and coefficient of infection in Moghan classified genotypes into four main groups. On the other hand, cluster analysis in Ardabil according to aforementioned traits, classified the varieties into three main groups. Compound analysis of variance according to infection type characteristics, disease severity and coefficient of infection in two regions indicated there is a significant difference between examined genotypes and interaction of genotype × region.