[Effects of cadmium stress on active oxygen generation, lipid peroxidation and antioxidant enzyme activities in radish seedlings].
When seedlings of radish were treated with Cd2+ from 125 to 500 micromol/L, for a period of 12 to 96 h in hydroponic system, increase in ratio of SOD to CAT and levels of O(-.)(2), H(2)O(2), MDA indicate that Cd2+ induces oxidative stress in radish plants. Antioxidant enzyme activities responded differently to the level and time of Cd2+ treatment. Under 125 micromol/L Cd2+ treatment a gradual increase in SOD activity was observed; at 250, 500 micromol/L Cd2+ treatment SOD activity increased first, then declined considerably to even lower than that of the control during later Cd2+ treatment. A gradual decrease in roots and a marked increase in leaves in CAT activity were detected. GR activity in both leaves and roots were enhanced significantly with the increase in content of Cd2+ and time of treatment. The increase in GR activity suggests that AsA-GsH cycle may be activated to scavenge the AOS or the synthesis of PC may be stimulated to chelate cadmium.
Tang
Chun-Fang
CF
Department of Environmental Science and Engineering, Hunan University, Changsha 410082, China.
Liu
Yun-Guo
YG
Zeng
Guang-Ming
GM
Li
Cheng-Feng
CF
Xu
Wei-Hua
WH
D000975:Antioxidants / Q000378:metabolism*; D002104:Cadmium / Q000494:pharmacology*; D002374:Catalase / Q000378:metabolism; D005980:Glutathione Reductase / Q000378:metabolism; D015227:Lipid Peroxidation / Q000187:drug effects*; D031224:Raphanus / Q000187:drug effects* / Q000378:metabolism; D017382:Reactive Oxygen Species / Q000378:metabolism*; D036226:Seedlings / Q000187:drug effects* / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
D000975:Antioxidants; D017382:Reactive Oxygen Species; D002104:Cadmium; D002374:Catalase; D013482:Superoxide Dismutase; D005980:Glutathione Reductase