PERFORMANCE AND STABILITY OF SOME GRAIN SORGHUM GENOTYPES UNDER DIFFERENT ENVIRONMENTAL CONDITIONS

Abstract

Evaluation of sorghum genotypes under different environments is essential for testing stability of performance and degree of adaptation which are important goals of breeding programs. Fifteen grain sorghum genotypes (Sorghum bicolor (L.) Moench) of diverse origins were evaluated during 2019 and 2020 growing seasons at three locations, namely Shandaweel, New valley and Toshki Agric. Res. Stations. The joint regression analysis showed highly significant differences among genotypes and among environments, as well as significant genotype x environment interaction, indicating differential responses of genotypes to changes in environment for the studied traits. The G × E interactions were linear functions to the environment which were significant for all the studied entries. The evaluation parameters used were mean performance, regression coefficient and the mean squares deviation from regression. Stability analysis showed that the most stable genotypes were No. 15 for days to 50% flowering, No. 2 for plant height, No. 2, 9 and 13 for protein content, No. 10 for 1000-grain weight and genotype No. 11 for grain yield/plant.