Stability of grain yield in bread wheat genotypes under different environments

Abstract EN

Stability is important indicator in light of climate change in the Mediterranean region.

Therefore, thirteen bread wheat genotypes were evaluated for grain yield under eight different environments.

The environments were the combinations of four irrigation regimes (normal, mild, moderate and severe stress) × two seasons (2016/2017 and 2017/2018).

Results indicated that stability analysis of variance revealed highly significant G x E “linear” for grain yield.

Phenotypic stability parameters showed that wheat genotypes Gemmeiza12 and Line 3 were highly adapted to improved environments.

On the contrary, wheat genotypes Sakha 95, Line 142 and Line 1 were adapted to water stress environments.

Furthermore, wheat genotypes which could be grown under a wide range of environments were Misr 1, Misr 2, Sakha 94, Giza 171, Shandweel 1, Line 26 and Line 6 for grain yield.

The most desired and stable genotypes were Misr 1, and Gemmeiza 11 for grain yield.

The additive main effect and multiplicative interaction (AMMI) analysis of variance showed that 49.56, 28.90 and 1.79% of the total sum of squares were attributable to environmental, genotypic and genotype x environment interaction (GEI) effects for grain yield, respectively.

Both models of Eberhart and Russell (1966) and AMMI (Gauch, 1992) are consistent in describing the stability of Misr 1 and Gemmeiza 11 for grain yield.

These genotypes could be useful in wheat improvement programs for enhancing stability.