Genotype x Environment Interactions and Stability Analysis for Economic Traits in Sesame (Sesamum indicum L.)

摘要

This study examined elite genotypes of sesame across three locations for the estimation of GE interaction and to identify stable genotype(s) using stability parameters, and determine inter parameters correlation. Two locations (NARC and D.I. Khan) were suitable for high productivity. PR-19-9-S was high yielder (341 kg/ha) at NARC and V-90005 (344 kg/ha) at D.I. Khan. The variance due to GE interaction was highly significant for all the traits showing heritable variation among the genotypes. The linear component of GE interaction was significant for all traits except branches per plant. Pooled deviation was significant only for yield indicating the differential genotypic response across the locations. The significant variance due to environment (linear) indicated that the performance of genotypes was under genetic control. The b-values of V-90005, T-89 and PARS-Ⅰ were larger than unit regression hence suitable for favourable environments for yield. Whereas, Ⅴ-Ⅲ and Sanghar-Ⅰ were with b-values less than unity indicating their below average response. For branches per plant, Sanghar-Ⅰ and S-17 had regression coefficients less than one with negative sign making them suitable only for poor environment. Four genotypes namely, Sanghar-Ⅰ, S-17, PR-19-9-S, and Rattodero-Ⅰ had greater than unity and non-significant regression coefficients with high response towards better agronomic conditions and were stable due to low deviation from regression. For seed yield, correlation between mean and b-value and mean and S~2d was significant and positive suggesting that average yield could be considered as a measure of response and stability.