evaluation of the effect of salinity stress on ion accumulation, quantitative and qualitative yield of spring rapeseed cultivars

dry land salinity is one of the major problems affecting agricultural products. the main consequences of plant exposure to salt stress are water deficit and ion excess, which lead to several morphological and physiological changes. in order to evaluate the effect of salinity on some physiological characteristics of 8 spring rapeseed cultivars, an experiment was conducted in the greenhouse at yasouj university as a factorial in a complete randomized design with three replications. the first factor includes four salinity levels (1.92 (as control), 9.87, 19.6 and 21.94 dsm-1 (nacl and cacl2 with ratio 20 to 1 in hoagland solution)) and the second one includes eight cultivars (pp-308-8, pp-401-16, hyola330, hyola60, hyola401, rgsoo, oftion500 and pp-401-15e). leaf k+, ca2+, na+ and mg2+ concentration and k+ to na+ ratio, biological yield, grain yield and oil percentage were measured. results showed that with increasing salinity levels, leaf k+ concentration, k+ to na+ ratio, biological yield, grain yield and percent oil significantly decreased, but leaf na+ and mg2+ increased. high grain yield cultivars (hyola 60 and hyola 330) had significant lower concentration of na+, ca2+ and mg2+ and higher leaf k+ concentration and k+/na+ ratio. in summary, hyola 60 and hyola 330 cultivars that had higher yield than the other cultivars were the most tolerant and pp-401-15e and oftion500 cultivars were as the most sensitive cultivars to salinity respectively.