Efficiency of using gibberellic acid hormone on grain yield performance of imported cultivars faba bean by GGE-biplot method

It is quite effective to identify high-yielding and stable genotypes and evaluate different genotypes in various environmental conditions.

This study was conducted to evaluate the response of 12 imported faba bean genotypes with the application of gibberellic acid hormone (environmental factor) by the GGE-biplot method. For this purpose, genotypes were evaluated in a complete randomized design with three replications during autumn of 2018 in the research greenhouse of Shahrekord University. Gibberellic acid was sprayed at concentrations of 0, 10, and 30 ppm from the 2-leaf to flowering stages on a weekly basis.

The analysis of variance showed that the effects of genotypes, gibberellic acid, and their interaction effects were significant in grain yield. The genotypes by the gibberellic acid sum of squares explained 22.33% of total grain yield variations. Using the GGE-biplot model, the first two components accounted for 86.5% of total grain yield variations due to the effect of genotype and the interaction effects between genotypes and gibberellic acid hormone.

Based on the analysis of GGE- biplots, the grain yield of genotypes C2, C4, C10, and C6 was higher than other genotypes. Furthermore, they had appropriate relative responses to the application of gibberellic acid hormone than other genotypes. Regarding the need for genotypes with high yield potential to increase in seed yield, they can be used for breeding this product. The eight remaining genotypes had lower grain yields with the most inappropriate responses to the application of gibberellic acid hormone, identified as undesirable genotypes.