| چکیده انگلیسی مقاله |
To study genotype×environment interaction and stability of grain yield in bread wheat genotypes, 20 promising winter and facultative bread wheat lines were evaluated for grain yield (YLD) in 10 locations in 2001/02 and 2002/03 cropping seasons. Ten locations included Karaj, Zanjan, Ardebil, Arak, Miandoab, Jolgerokh, Mashhad, Hamedan, Eqlid and Tabriz. Experimental design in each environment was randomized complete block (RCB) with three replications. Stability parameters including environmental variance , environmental coefficient of variation , Wricke´s ecovalence , stability variance of Shukla (σ , regression coefficient , deviation from regression , coefficient of determination , intra-locational variance (MSy/l) and simultaneous selection for grain yield and stability (YS) were estimated. Results of stability analysis showed that based on the most methods, lines C-80-14, C-80-19 and C-80-20 were determined more stable than the otherse considering the majority of the statistic parameters. However, based on simultaneous selection for yield and stability method genotypes C-80-4, C-80-6 and C-80-11 were identified as the superiors. Among these genotypes, C-80-4 and C-80-6 were further evaluated in on- farm and verification trials in farmers´ fields in different regions of cold zone which based on the results they produced higher yield than the commercial cultivars of the regions. |