Genotype × Environment Interaction and Stability Analysis in Mungbean

Abstract

Mungbean is an important grain legume widely grown in India. Thirty genotypes of mungbean developed through mutation breeding from three parents namely B1, B105 and SML32 were evaluated on seven environments of West Bengal, India. Stability parameters were computed to know genotype x environment interaction and genotypic performance for yield per plant and its components. Wide range of variation was observed for seed yield and components across environments. Genotypes were grown best in sandy-loam textured soil coupled with low pH (5.7), indicating acidity and moderate water holding capacity, accompanied with higher proportion of available nitrogen percentage, moderate P2O5 and organic C. The analysis of variance showed highly significant variance for genotypes, environments and genotype x environment interaction. The significance of genotype x environment interaction accentuated the implication of stability analysis in crop improvement programme. The analysis of variance exhibited comparatively higher magnitudes of linear components than the non linear components and thus the characters were predictable in nature. Identification of stable genotypes over environments was done by stability analysis following model of Eberhart and Russell. Sustainability index was also estimated for searching the stable genotypes. In most of the cases, the stability for yield components was concomitant with stability for seed yield per plant. Four mutant genotypes namely CUM1, CUM4, CUM10 and CUM13 registered average stability coupled with high mean performance for seed yield per plant and components consistently, based on regression parameters and sustainability index. Keywords: Genotype x environment interaction, Mungbean, Stability, Sustainability index