Genotype x Environment Interaction and Stability Analysis of Mungbean Genotypes for Yield and Its Attributing Traits

Mungbean (Vigna radiata L. Wilczek), also known as green gram, is a warm-season annual legume characterised by rapid growth. This study aims to investigate the genotype and environment interaction and stability analysis of mungbean genotypes for yield and its attributing traits. In this study, a total of 40 mungbean genotypes were examined for stability analysis. The present investigation was carried out at Student’s Instructional Farm, Chandra Shekhar Azad University of Agriculture and Technology, Kanpur- 208 002 (U.P.) during summer 2022, kharif 2022 and summer 2023. The pooled analysis of variance conducted across three distinct environments revealed that the genotypic (G) variance was significant for several traits, including days to 50% flowering, days to maturity, plant height, number of primary branches per plant, number of pod clusters per plant, pod length, number of seeds per pod, 100-seed weight, biological yield per plant, seed yield per plant, and protein content. The analysis of G x E interactions revealed that G x E (L) interactions were found to be highly significant for the traits: days to 50% flowering, days to maturity, plant height, number of pod clusters per plant, pod length, number of seeds per pod, biological yield per plant, harvest index, and seed yield per plant. In this study, forty genotypes, exhibiting mean values either above or below the total mean, were categorised into four groups based on stability parameters, specifically the regression coefficient and squared deviation. Group I includes genotypes that possess a desirable mean and a regression coefficient close to one, accompanied by a non-significant squared deviation. Group II comprises genotypes with a regression coefficient significantly less than one and a non-significant squared deviation, indicating their adaptability to unfavourable environments. Additionally, genotypes with a regression coefficient significantly greater than one are also included in Group II, suggesting their suitability for favourable conditions. Conversely, genotypes classified in Groups III and IV cannot be reliably predicted due to their significant squared deviation, regardless of their regression coefficient values. The genotypes KM 2195, NM13 5, NM1705, SML1839, and SML1723 were found stable for yield and yield-related traits.