Grain yield potential and stability of some bread wheat (Triticum aestivum L.) genotypes

Genotype and environment (G x E) interactions are of major concern to plant breeders in breeding cultivars. The objective of this study was to determine the stability of grain yield in 20 wheat genotypes. The experimental layout was a randomized complete block design trials of three replicates. Two methods of genotype x environment interaction analysis were performed and results were compared : the regression model and the additive main effects and multiplicative interaction model (AMMI). Analysis of combined analysis of variance for yield showed significant effects of the experimental sites and of the varieties. Significant interactions of these main effects were also shown. Based on AMMI method, genotypes No. 5, 6, 11, 15, 16 and Marvdasht variety showed general adaptability and genotypes 17 and 18 recognized to have specific adaptability to Varamin and genotypes 4, 19 and 20 had specific adaptability to Kermanshah. Overall, based on stability analysis on yield genotypes 15, 16 and Marvdasht with having good adaptability were determined as desirable genotypes. According to most of the parameters used in the study, genotypes 15, 16 and Marvdasht appeared to have a good level of general adaptation to all environments.