Study on Adaptability and Grain Yield Stability of Durum Wheat Genotypes

In order to evaluation  of adaptability and grain yield stability of 16 durum wheat genotypes, an experiment was conducted under rainfed and  supplemental irrigation conditions based on a randomized complete block design with three replications at Sararood dryland agricultural research station (Kermanshah, Iran) for three cropping seasons (2012-13, 2013-14 and 2014-15). Analysis of variance (ANOVA) indicated significant differences (P<0.01) between the main effects due to genotype, environment, and genotype x environment (GE) interaction. The magnitude of GE interaction was greater about twice times than the genotype effect that indicates the probability of different environmental groups for the genotypes adaptation. Biplot analysis of grain yield data based on AMMI model showed that the genotypes had different responses to the environments, so the adapted genotypes were determined for each environmental group. According to Ebrahat and Russell's criteria, genotype G1 and G3 with higher yield than grand mean, and minimum variance deviation and regression coefficient close to unit, were found as desirable genotypes. Based on AMMI stability value (ASV), genotypes G13, G6 and G10 were identified as most stable genotypes.