Determination of Yield Stability in Durum Wheat Genotypes under Rainfed and Supplementary Irrigation Conditions

Tests were done to determine high-yielding and stable durum wheat genotypes. An experiment was set up as a RCBD (Randomized Complete Block Design) with three replications on ۱۷ advanced durum wheat genotypes under rainfed and supplementary irrigation conditions in the cropping seasons of ۲۰۱۱-۱۳. Combined analysis of variance indicated that environment main effect accounted for ۷۰.۰۹% of total yield variation; and effects of genotype and Genotype×Environment Interaction (GEI) accounted for ۲.۹۵ and ۱۰.۷۱%, respectively. Results indicated remarkable difference in genotypes response across environments. G×E interaction was analyzed following Additive Main effects and Multiplicative Interaction (AMMI) model. The first two interaction Principal Component Axes (IPCA۱ and IPCA۲) explained ۵۳.۷۵ and ۳۶.۹۹% of total interaction effects, respectively. Based on the AMMI model, AMMI Stability Value (ASV) and Genotype Selection Index (GSI), genotypes G۱۱, G۸, and G۱۴ were selected for all environments. According to the AMMI۲ biplot, the G۱۵, G۱۶ and G۱۷ exhibited specific adaptation with rainfed (E۱) and irrigation (E۲) environments. G۳ and G۴ displayed specific adaptation with rainfed (E۳) environment and G۱۰, G۹, G۱, and G۱۲ indicated specific adaptability with irrigation (E۴) environment. The E۳ had high discrimination ability, so, this environment was considered sufficient for making genotypes recommendation. Results of this investigation illustrate that the AMMI stability parameters are suitable for characterizing stable genotypes and that the GSI parameter can detect genotypes with high grain yield and good stability for plant breeding research in durum wheat.

Keywords:

adaptation , AMMI analysis , ASV , GSI , GEI