Genotype x environment interaction for seed yield and its components in advance breeding lines of greengram [Vigna radiata (L.) Wilczek].

摘要

Twenty-nine advanced breeding lines of green gram along with 3 control cultivars (Chinamung, Pusa Baisakhi and Selection-4) were evaluated for stability during summer 2004 in Dharwad, Bagalkot and Bailhongal, Karnataka, India. Data were recorded for clusters per plant, pods per plant, pod length, 100-seed weight and seed yield per plant. The pooled analysis of variance revealed that mean sum of squares due to genotype was highly significant for all characters indicating presence of variability among the genotypes. The mean sum of squares due to environment was also highly significant for all the characters except 100-seed weight. The genotype x environment interaction was significant for all the characters except for 100-seed weight indicating differential response of the genotypes in different environments. On the other hand, genotype x environment component of interaction was not significant for all the characters indicating non-significant rate of linear response of the genotypes to environmental changes. The characters indicating that non-linear component of genotype x environment interaction was also predominant. The environmental indices for characters for which stability parameters were worked out indicated that Dharwad was the most favourable environment for all the characters. The genotypes KGS-7, KGS-12, KGS-21, KGS-17, KGS-19, KGS-20, KGS-22, KGS-24, KGS-25, KGS-28 and KGS-29 exhibited high mean number of clusters per plant along with non-significant regression coefficient and deviation from regression indicating wide adaptability across the environments. KGS-5, KGS-7, KGS-13, KGS-19, KGS-21, KGS-28, Chinamung, Pusa Baisakhi and Selection-4 were stable based on stability parameters, suggesting their suitability across 3 environments. Out of the genotypes identified as stable, KGS-5 recorded the highest seed yield per plant (5.58 g)..