اثر تنش های شوری و خشکی بر موئلفه های جوانه زنی دو رقم کلزا (Brassica napus L.)

n order to evaluate the effect of combined salt and drought stress on two rapeseed cultivars, an experiment was conducted in the laboratory during 2013 at Shahid Chamran University of Ahvaz. A factorial experiment based completely randomized design was conducted. The experiment was performed at germination and seedling stages of two tested canola cultivars (Hyola401 and Shirale) under three levels of the water quality (NaCl) including the distilled water as control, 100 and 200 mM and three levels of drought (PEG concentrations) including control (without PEG), 10 and 15%. Results showed that the salinity and drought stresses decreased germination percentage, germination rate, seedling fresh weight, shoot dry weight, and root dry weight, shoot length, root length, Whereas, ratio root length to shoot length was less effect by stresses. The effect of salinity was more on these traits than to drought stress and caused a greater reduction in Shirale than to Hyola401 variety. Also, adverse effect of combined stress on seedling characteristics was more than to sole stress.