Genotype × Environment interaction and seasonal stability analysis for various quantitative traits in knolkhol (Brassica oleracea var gongylodes L.)

Abstract:

The goals of this study were to find stable Knolkhol genotypes for yield and yield attributing traits in the subtropical region of Jammu (J&K), India, and to examine genotype-environment (GE) interaction.Twenty five genotypes were studied in four environments (E1: Winter season (2015-16), E2: Spring- Summer (2016-17), E3: Rainy Season (2016-17) and E4: Autumn Season (2016-17).For all parameters except the number of leaves per plant, highly significant mean sum of squares for genotypes, environments, and genotype-environment interaction were recorded, showing that both linear and non linear components were relevant in constructing the total G* E interaction. Seasonal stability was estimated using the Eberhart and Russell method (1966). On the basis of three stability parameters (mean, regression coefficient and deviation from regression coefficient) the genotypes G-40, SJKK-02, and SJKK-03 have been found stable for early maturity. For leaf characteristics the genotypes G-40, SJKK-04 and Green Gold were stable for the number of leaves per plant, three genotypes Knolkhol White, Purple Vienna-I, and Nawpura Local were stable for leaf length and genotypes SJKK-02, SJKK-03, Pusa Virat and Mamta were stable in their performance for leaf width across all the season under study. In terms of knob yield traits the genotypes G40, SJKK-04, Early White Vienna and C-2002 were capable of giving a consistent performance across seasons for yield and yield attributing traits such as marketable knob diameter, gross weight per plant, marketable knob weight per plant and yield per plot and were ideal to be recommended for wide cultivation in all the four seasons of Jammu.