Stability for grain yield and its contributing traits in sesame (Sesamum indicum L.)
In this study, a set of seventeen genotypes of sesame (Sesamum indicum L.) were evaluated over three years from 2012-13 to 2014-15 to assess the stability of these genotypes for yield and its contributing traits over years and environments. Analysis of variance for stability with respect to 8 traits revealed highly significant variation due to environment for all traits which indicated differential effect of different seasons. The variance for genotypic effect was highly significant for all the traits observed, indicating thereby differential response of all the genotypes. Genotype × environment (linear) interaction was significant for seven traits namely; days to 50% flowering, plant height (cm), days to maturity, branches/plant, capsule /plant, capsule length (cm) and seed yield (g) indicating substantial amount of predictable G×E interaction. Environmental indices indicated that performance of genotypes over three environments varied apparently and environment E1 showed highest favourable impact on grain yield. The varieties TKG-478, TKG-501, TKG-503, TKG-506, TKG-306 and TKG-512 with superior mean performance, regression coefficient near to one and non-significant S2di values showed average stability for grain yield. Based on stability parameters these varieties can be considered as stable performers and may be utilized for hybridization programmes to improve sesame yields. This indicates that these genotypes performed better across environments. The stability of different yield contributing traits varied in compensating manner in different genotypes imparted grain yield stability.
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