Effect of seed irradiation with low dosed of gamma ray on some seedling emergence and morphological parameters of two species of Bromus tomentellus and Agropyron elongatum

Low doses of gamma radiation are widely used to stimulate seed germination, growth and crop production. This study was conducted to study effect of irradiation with doses of 20, 30, 50, 100 and 150 Gy of gamma ray on seeds of two species of Ag. elongatum and Br. tomentellus. For this purpose, for each species in an experiment with completely randomized design, three replications of treated seeds with gamma ray were sown in plastic pots and the parameters of germination capacity, germination rate, germination value and biomass of shoots and roots was evaluated. The results showed the treat of 30 gray had the most significant effects on the evaluated parameters of Ag. elongatum, and the most increase in germination rate, germination value (P