Ranking forage sorghum lines (Sorghum bicolor L.) to salinity tension on the basis of primitive growth of seedling

In order to identify tolerant forage sorghum lines to salinity tension conditions, this research was conducted at Seed Technical Laboratory of Islamic Azad University, Shoushtar Branch in 2013, as factorial under Completely Randomized Design (CRD) with three replications. The First factor included fifteen promising forage sorghum lines and the second factor included salinity tension with NaCL in five levels (0, -3, -6, -9 and -12 bar) .The traits germination percentage (27.23%), germination rate (30.18%), length of rootlet (77.74%), length of plumule (73.24%), seed vigor index (82.73%) and wet weight of seedling (59.38%) were decreased by decreasing in osmotic potential(-12 bar).The mean germination time trait (68.83%) increased with decreasing in the osmotic potential (-12 bar). Line KFS10 showed the highest germination percentage, length of rootlet, seed vigor index and dry weight of seedling. With attention to lines ranking basis the studied traits, line KFS10 as the tolerant line to salinity specified the best score and line KFS1 was in the lowest rank regarding salinity tolerance.