While seedlings of Radish raised in increasing contents of Cd(2+) in hydroponic system, increment in ratio of superoxide dismutase (SOD) / catalase (CAT) and levels of superoxide anion (O(2)(center dot-)) and lipid peroxides was observed; 125 mu mol.L(-1) Cd(2+) treatment resulted in a gradual elevation in SOD activity; while at Cd(2+) level of 250 and 500 mu mol-L(-1) SOD activity considerably increased at first, then declined to even lower than that of the control. CAT activity showed enhancement in leaves whereas decrease in roots. Cd(2+) induced an obvious elevation in GR activity in both ...
