The study of the effect of salinity on seed germination in species of Agropyron, Bromus, Secale

This research was carried out to determine the more salinity tolerant species of Agropyron desertorom, Bromus tomentellus, Secale montanum. Two genotyps were selected for each species. The experiment was conducted based on a factorial design including five salinity levels of 0,100, 200, 300 and 400 mM Nacl and Cacl2 treatments. The research was performed for germination characterisrics in laboratory conditions. Data were recorded and analyzed for seed percentage and speed of germination, length of root and shoot, length of plantlet, ratio of S/R, vigour index and plantlet dry weight were evaluated. According to the results in the higher stress values showed that speed of germination in all of the species had significant decrease (P<0/01). Also, Secale had the highest percentage rate and speed of germination between grasses. In the other hand, vigour and plantlet dry weight characteristics under salinity different levels showed significant differents (P<0/01). Agropyron had the higher vigour index than the other species, but in the study of plantlet dry weight characteristic, Agropyron had the minimum weights.