Study of interaction of genotype * environment and Stability of grain yield in bread Wheat cultrivars in Kurdestan Province

To study genotype x environment interaction and stability of grain yield in bread wheat genotype، 8 bread wheat genotype were evaluated for grain yield in 6 location in 2007-2010 cropping seasons. six location included Sanandaj، Gorveh، Marivan، Divandarreh، Saggez and Baneh. Combined analysis of variance (three years x six locations) for grain yield showed significant differences among the genotypes، year x location، genotype x year and year x location x genotype interaction were significant. Yield Stability indices used were Shukla stability variance، Rick ecovalance method، rank nonparametric method and cluster analysis. Results of stability analysis with Riclk ecovalance method showed that Zarrin and Sabalan cultivars had the lowest amount of ecovalance. Stability analysis based on Shukla method showed that Zarrin and Sabalan cultivars had the most stablest grain yield، respectively. Also stability analysis based on rank method showed that Alvand and Sabalan cultivars had the most stablest grain yield، respectively. Cluster analysis for mean yield and stability parameters grouped cultivars into five categories. The conclusion of results showed that the Zarrin and Sabalan cultivars had the lowest yield stability and can be recommended for studied locations.