A comparison of bread wheat genotypes under various environments using different stability models
SVU-International Journal of Agricultural Sciences
Twenty-five bread wheat genotypes were tested under eight environments (2 growing seasons×4 water stresses) to study stability and adaptability for physiological and agronomic traits. Analysis of variance showed highly significant variations among all tested genotypes for all studied traits; chlorophyll content, canopy temperature, specific leaf area, spike length, no. of spike/plant, 1000kernel weight and grain yield. The results indicated that Line 9 (13.21 ardab/feddan) beside Sids 1 (13.19
... side Sids 1 (13.19 ardab/feddan) and Misr 2 (11.91 ardab/feddan) cultivars were observed as most stable and widely adapted across environments, surprised mean performance for grain yield than grand mean, regression coefficient (bi Eberhart and bi Freeman ) equal or near to one, Bi Perkins equal or near to zero and mean square deviation from regression (S 2 di Eberhart and S 2 di Freeman ) non-significant from zero, according to previous models. Moreover, Line 9 showed also stability for number of spikes/plant, 1000 kernel weight and chlorophyll concentration under various environments; it was considered to be superior for grain yield across different environments. Meanwhile, the highest yielding genotype (Line 20) showed stability only under favorable conditions (surpassed the grand mean by 15.58 ardab/feddan, bi E and bi F > 1, Bi> 0 and S 2 di E and S 2 di F non-significant), it could be promoted to breeding program with a stable genotype (Line 9) over different environments to obtain a stable variety across environments with a high yield.