Seed Yield Response of Faba Bean (Vicia faba L.) Genotypes to Drought Stress

The response of seed yield and its components of 21 faba bean genotypes to drought stress was assessed using randomized complete block design with three replications, under two moisture environments; non stress (optimum irrigation) and drought stress (cut off of irrigation form commencement of flowering) and in two cropping seasons (2016-17 and 2018-19) at Gorgan agricultural research station, Gorgan, Iran. Combined analysis of variance showed that moisture environment had significant effect on all studied traits except 100-seed weight. Drought stress caused reduction in seed and biological yields as well as harvest index by 59.71%, 31.81% and 41.92%, respectively. Genotypes; G-Faba-66, G-Faba-65, G-Faba-62, G-Faba-294, G-Faba-292, G-Faba-523, G-Faba-525 and G-Faba-21, under non stress conditions (optimum irrigation), and G-Faba-67, G-Faba-66, G-Faba-75, G-Faba-72, G-Faba-65 and G-Faba-62, under drought stress conditions, had the highest seed yield, respectively. G-Faba-67 showed the highest level of tolerancee to drought stress considering seed yield, number of seed pod-1 and harvest index.