Plant salt stress is a condition where excessive salts in soil solution cause inhibition of plant growth or plant death. On a world scale, no toxic substance restricts plant growth more than does salt. Salt stress presents an increasing threat to plant agriculture. The objective of this work was to evaluate the effects of the salinity stress (control, 150 and 300 mM NaCl) on 12 canola (Brassica napus L.) cultivars (Olga Ã?Ë?Ã?Å?Wild cat, Sari gol, Herosr, Cracker, Comet, Option 500, SW hotshot, Amica, SW5001, Eagle and RGS003). The experiment was split plot design under hydroponic culture in Greenhouse of university of Tabriz, Iran. Morphological parameters of root and shoot dry weight, 1000-seed weight, length of pod, number of pods per plant, seed yield and osmotic potentional in leaves canola cultivars were highly significant differences for main and interaction effects of two factors (salinity and Genotype) studied. salinity decreased the roots and shoots dry weight of canola plants and this effect was particularly significant at high level of stress. Phat analysis indicated that, number of pods per plant was thermore influenced traits on seed yield under normal and salinity condition. Therefore, selection based on pod per plant would be more effective to improving seed yield of canola in salinity stress conditions and This trait is easy to determine and would be useful in breeding programs.
