Stability of bean (Phaseoulus vulgaris L.) genotypes in common bacterial blight condition using regression analysis, the additive main effects and multiplicative interactions (AMMI) and Muir methods

Common bacterial blight (CBB) caused by Xanthomonas axonopodis pv. phaseoli is a serious disease of bean fields in Iran and the world. Chemical control of CBB is inefficient, therefore the use of resistant genotypes with stability production is the most suitable alternative. Stability and adaptability of 26 bean genotypes yield in the presence and absence of CBB were evaluated in Agricultural Research and Natural Resources Center of Markazi Province, in 2007 and 2008 using regression analysis, the additive main effects and multiplicative interactions (AMMI) and muir methods. The best genotype in regression analysis, based on yield, regression coefficient and deviation from regression was 21407. In AMMI analysis, the first two interaction principal component axes (IPCA1 & IPCA12) explained 90% of the genotype×environment interaction. Biplot of yield mean and IPCA1 showed that genotypes 21407 and 21275 were the most stable with high yield. In muir method, 21% and 79% of the genotype×environment interaction belonged to heterogeneous variance (HV) and imperfect correlation (IC), respectively. In this method the genotype 21410 had the least total sum of squares of genotype × environment interaction, so it was the most stable genotype. According to all results, the best genotype was 21407 based on stability, yield and resistant to CBB.