Genotype x Environment interaction and stability analysis for grain yield and its components in Halugidda local rice mutants

The genotype (G) x environment (E) interaction and stability for grain yield and some associated traits was studied during the year 2002-2006 in eight Halugidda local rice mutants in the hill zone of Karnataka. Significant G x E interaction was observed for all the traits studied. The pooled deviation was significant for the majority of the traits including grain yield and considerable genotypic difference was observed. Both the linear and non-liner components of G x E interaction were significant, but the linear component was more predominant. Based on the stability parameters, rice mutants HSM-23 and HSM-27 showed higher grain yield over the population mean, with regression coefficient near unity and zero deviation from regression. Thus, they were found to be stable and may be recommended for the commercial cultivation in this region/ zone of Karnataka.