بررسی برخی پاسخهای فیزیولوژیک ارقام مقاوم و حساس گلرنگ در استرس آلودگی به کادمیوم

In order to investigate the physiological responses of tolerant and non-tolerant safflower genotypes to Cd-induced oxidative stress, a 4-replicate randomized complete block factorial experiment was conducted at the Stockholm University, Sweden. three levels of Cd (including 0, 1 and 20 µM CdCl2) and three genotypes (AC-Sterling, Arak and Saffire) were applied to the hydroponics culture condition. Cd tolerance index (CTI), lipid peroxidation, superoxide dismutase (SOD) activities and suberization associated with the casparian band in the root were measured in 14-day treated plants. According to the Both CTI and lipid peroxidation AC-Sterling and Arak were tolerant and non-tolerant genotypes respectively. Cell wall-bound Cd in safflower root did not indicate a significant role in genotypic differences at least under the high CdCl2 levels in the nutrient solution. Cell wall-bound Cd in safflower root, however, did appear to play a role under the low CdCl2 levels at least with the tolerant Ac-Sterling. In this study, however, no root suberzation difference was observed between the three genotypes. The SOD activity in response to Cd stress was genotype- and Cd-dependent. The non-tolerant and semi-tolerant genotypes did not indicate a high SOD activity under high Cd levels.