Investigation of genotype × environment interaction using GGE biplot method on grain yield in sesame

Sesame is one of the most important oil, industrial and medicinal plants. Sesame is cultivated in a large area of tropical and subtropical regions. In this study, fifteen sesame genotypes are cultivated to identify superior genotypes in terms of yield and stability (minimum environmental impact) in four locations of Arak, Birjand, Karaj, and Shiraz for two years. In combine variance analysis, the year effect and yaer × location, genotype × year and genotype × location × year were meaningful. The first and second main components in bipod analysis explained 84.06 and 8.40 (92.46 in total), respectively, the percentage of changes due to the impact of the environment on genotypes. According to the plots, genotypes in Arak, Birjand, and Shiraz have a high correlation with each other. The best genotypes in Arak, Birjand, Karaj, and Shiraz were Darab 14, Safiabad 1, local Ahvaz, and local Isfahan. Also in the Karaj location, Fars local cultivar, Khondab local cultivar, and Darab 1 were evaluated as superior. In general, the best genotypes in this trait in terms of yield and high stability were two genotypes, Safiabad 1 and local Khondab. In contrast, TS-3 and Yellow White genotypes were the most unstable in addition to low yield compared to other genotypes. Genotypes in the Shiraz environment had the least impact on the environment and in the Birjand environment had the maximum impact. The study areas of this experiment were divided into two megaenvironment, the first inclouds Arak, Birjand and Shiraz, and second inclouds Karaj.