Additive main effect and multiplicative interaction analysis for agronomic performances in bread wheat (Triticum aestivum L.) advanced lines across multiple environments
摘要
The assessment of genotype × environment interactions (GEI) and the trait stability estimation are pivotal in germplasm selection and varietal development. In this study, forty bread wheat (Triticum aestivum L.) advanced lines were subjected to a multi-environmental evaluation across seven different environments to assess their agronomic performances and yield stability under both irrigated and rainfed conditions. The trials were conducted according an RCB Design under 7 different environments in four different locations for two consecutive cropping seasons 2016–2017 and 2017–2018. Results showed high genotypic variation between the studies genotypes with significant effects of environment and GEI for all studied traits. The environment effect was mostly predominant for grain yield and tillers m−2, while GEI effects were predominant for grains spike−2. Clear and predominant genotypic effects were observed for kernel weight. Agronomic performance of different tested genotypes and their stability across all environments were confirmed at a higher dimension using principal component analysis (PCA). The two first components of the PCA (PCA1 and PCA2) explained 57.1% of the total GEI variation for grain yield, 50.4% for grains spike−1, 53.3% for kernel weight and 72% for tillers m−2. G34 showed the highest mean grain yield (3509 kg ha−1) with a relatively high AMMI stability value (6.1).