Study of genotype × environment interaction effect on seed yield of red bean (Phaseolus vulgaris L.) genotypes using AMMI method

To study genotype, environment, genotype × environment interaction effects for grain yield on red bean, ten red bean genotypes were evaluated at five locations (Borujerd, Zanjan, Shahrekord, Tabriz, and Khomein) for two cropping seasons (2012- 2014). The experiment was conducted using a randomized complete block design with three replications. Combined analysis of variance for grain yield showed that the main effects of both genotypes and environments, and the genotype × environment interaction effect, were highly significant. Average environmental grain yield across genotypes ranged from lowest of 1615.8 kg.ha-1 in Shahrekord in 2012 to the highest of 4069.8 kg.ha-1 in Borujerd in 2013. Environment main effect was the main source of variation that accounted for 61% of the total yield variation. Analysis of variance of additive main effects and multiplicative interaction (AMMI) showed that eight IPCAs were significant and residue effects (noise) was considered zero. The first three main components of AMMI model explained 79.8% of the total yield variation. Genotype KS31290 was identified as the most stable genotype based on the values of the first three main components, ASV and D parameter. Genotype KS31285 with the highest ASV and D parameter, and the most distance from the center of biplot was unstable genotype. However, this genotype had higher yield (2900 kg.ha-1). Based on the results of this experiment, KS31290 can be considered as a promising line for being released in areas with similar climatic conditions as those in experimental sites.