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Sudan Journal of Agricultural Research

Implications of genotype x environment interaction in sesame (Sesamum indicum L.) evaluation program

Mohmed El Hassanan Ahmed , A. A El Jack, and A. B. El Ahmadi

Abstract:

To assess implications of genotype x environment (G x E) interaction in sesame variety selection and evaluation programs, estimates of G x E interaction for seed yield were obtained from a study involving 20 sesame genotypes grown at the five locations over 3-year. At each location the entries were arranged in randomized complete blocks with three replications. The separate and combined analysis of variance for the yield and yield components of the 20 sesame genotypes over the 15 environments (5 locations and 3 years) indicated highly significant (P=0.001) differences among genotypes and environments. The highly significant genotype x location x year interactions for yield observed, indicate that genotypes of sesame showed differential responses at different environments. Therefore, it would be necessary to conduct variety testing or evaluation at several locations over a series of years. The theoretical standard errors of variety means expected under different replications, locations and years were estimated and used for comparing the different testing procedures with regards to their efficiency in evaluating or testing new varieties. Findings suggest that years of testing could be reduced by increasing the number of test locations. Phenotypic stability analysis indicated that there were marked genetic differences among the twenty genotypes for their adaptability, stability and yield potential. The regression coefficient of the means of a genotype upon the environmental indices could be considered as an indicator for a genotype behavior in the environments with low – and high – productivity potentials. It was observed that the environments with low – productivity potentials could not be efficient conditions when used in selection for genotypes to be grown at high – productivity potentials areas. These results support the idea of inclusion of non- stress environments in the testing program and that selection must be conducted in the targeted environments.





 

Sudan Journal of Agricultural Research Vol. 11  (2008) PP. 35-44