در مرحله جوانه زني GLYCINE MAX )L( MERR بررسي تحمل به خشكي ژنوتيپ هاي سويا

Evaluation of drought tolerance genotypes of soybean (Glycine max. L Merv) in germination stage

This experiment was conducted to investigate drsought tolerance in different soybean genotypes at germinatioA and seedling growth stage. The plots were arranged as factorial using complete randomized blocks. The factors included different genotypes (11 genotypes of soybean) and drought stress levels (control, -3, -7 and -10 bar). Germination and growth parameters were estimated in Petri dishes and paper towels, respectively. For evaluation of drought tolerance in genotypes, sensitivity index was calculated. Results indicated when water potential reduced, germination percentage, germination rate, stem and root length, and seedling dry matter were significantly decreased. The effect of drought stress was more severe on germination rate than germination percentage. Stem length was affected by water stress more than root length. Several soybean genotypes were differently responded because of genetic difference. Interaction between genotypes and water potential for some characters was significantly positive. Genotypes of Sahar, Dari, Hagen and Gorgan-3, indicated the least drought sensitivity index. Genotypes of LBK, BP, LWK and Williams were the most sensitive genotypes.