ارزیابی ژنوتیپ‌های جدید سویا (Glycine max L.) از نظر شاخص های تحمل به خشکی

In order to evaluate the response of 20 lines and cultivars of soybean to water deficit stress, an experiment was conducted at Agricultural Research Station of Gorgan in 2011 and 2012. For this Purpose, 2 separate experiments was conducted, each one in randomized complete block design, with 3 replications. In first experiment, all soybean genotypes were irrigated based on 50 mm evaporation from evaporation pan, but in second experiment, the irrigation was conducted based on 120 mm evaporation from evaporation pan. The results showed that, low soil moisture and induced drought conditions decreased seed yield in the studied genotypes, although the amount of decreasing was different. DPX×Fora (1) (2615 kg/ha) and DPX×Sepideh (10) (2294 kg/ha) had the highest seed yield under control and stress conditions, respectively. According to MP and STI tolerance indices, drought stress tolerance of DPX×Sepideh (5), DPX×K778 (10) and DPX×Fora (1) genotypes were more than that of other genotypes. The SSI and TOL indices showed that Fora×Epps (1) had the highest tolerance to drought stress. The superior genotypes can be recommended in different conditions of the Golestan province after complementally projects and breeding research programs.