This study aims to investigate the effect of different Ca2+ levels (0, 80, 160 mg·L-1 and 320 mg·L-1) on seed germination, activities of SOD, POD, and CAT, and protein content of Radix Isatisdis seedlings under different Cd2+ stress le
vels (10 mg·L-1 and 30 mg·L-1). The results show that low concentration of Ca2+, especially the concentration of 160 mg·L-1, may mitigate the deleterious effect of Cd2+ by increasing germination rate and vigour index, and enhancing activities of SOD, POD, and CAT, and increasing protein content. The influence of Ca2+ on the Cd2+ toxicity was not obvious at high Cd2+ concentration because of the inhibition of the above indexes. These results suggest that the low concentration of Ca2+ could be favorable for coping with Cd2+ toxicity, whereas high concentration of Ca2+ shows synergistic effect with Cd2+ for Radix Isatisdis. |