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Chocolate spot disease, caused by Botrytis fabae, is a major constraint that limits productivity of faba bean (Vicia faba) in Ethiopia. This is mainly due to lack of disease resistant genotypes from the locally adapted varieties. Therefore, the development of resistant faba bean varieties that are adapted to different agro-ecologies are important as it improves selection efficiency and reduce breeding time and cost. The study was, therefore, conducted to evaluate the effect of the genotype x environment interaction (GEI) for grain yield and chocolate spot disease resistance in 21 faba bean genotypes in six locations. A randomized complete block design with three replicates was used at each location. The additive main effects and multiplicative interaction (AMMI) and the genotype and (genotype x environment) (GGE) biplot analyses resulted in highly significant differences amongst genotypes, environments and GEI. The influence of the environment was far larger (61.4% contribution to the total variation observed) than the contributions from the genotypes (20.9%) and GEI (17.7%) In contrast, genotypes had the largest contribution (73.4%) to the variability observed for chocolate spot resistance. The site Kulumsa (E3) provided the best discriminating ability for the genotypes, while both AMMI and GGE biplot analyses identified six most stable and productive genotypes, and four genotypes with low chocolate spot severity but moderate stability. Overall, G14 and G5 with high mean yield, stable and moderate level of resistance at all locations are recommended as the best genotypes.

australian journal of crop science

Analysis of genotype × environment interaction and stability for grain yield and chocolate spot (Botrytis fabae) disease resistance in faba bean (Vicia faba)