Study on Genotype X Environment Interaction of Oil Content in Sesame (Sesamum indicum L.)

Abstract

2 Abstract: Oil content stability of twenty sesame genotypes of different sources of origin were studied for GEI in randomized complete block design with three replications across six environments in 2007. The objectives were to estimate the nature and magnitude of GEI for oil content and to identify stable sesame genotypes for general adaptation and unstable genotypes for specific adaptation. Combined analysis of variance showed highly significant (p≤0.01) difference between the genotypes, locations and GEI, suggesting differential response of genotypes across testing locations and the need for stability analysis. Proportion of varianc e captured by location is 16.8 %, genotypes 30.5 % and GEI 4.6 % of the total variation indicating less effect of location on oil content as compared to the effect of genotypes. Highest oil content of 52.5, 52.4, 52.1 and 52.0% was obtained from genotypes Temax, Acc-051-02-Sel-6, Acc-051-02-Sel-10 and Acc-212-332-4, respectively. Genotypes Abasena and S gave the lowest oil content of 49.2 and 45.9% respectively. Stability analysis was used to further shed light on the GEI of oil content. Two IPCA of AMMI were significant (P≤0.01) and captured the largest portion of variation of the total GEI for oil content, which indicated that the AMMI model 2 was the best for the data set. Genotypes Mehado 80, Argane, Addi, T-85, T-6P-32-3 and Kelafo-74 shown little GEI when both IPCA1 and IPCA2 considered and therefore stable.