Responses of membrane protection enzyme system of tobacco leaves on Hg, Cd and Pb stresses in soil.
Pot experiment was used to study the responses of membrane protection enzyme system of tobacco leaves on Hg, Cd and Pb stresses in soil. The results showed that POD activity gradually increased with increasing concetrations of Hg, Cd and Pb. CAT and SOD activity gradually decreased under three heavy metals common existing and SOD variation curve showed unimodal curve under single or two elements existing with increase of concentration of Hg, Cd and Pb. The effects of Hg, Cd and Pb in soil: three elemets together > two elements together > single element only. The effects resulted in an imbalance--activated oxygen produce and scavenge and physiological biochemical process disorder. There was a synergistic action for the effect of Hg, Cd and Pb in soil on membrane protection enzyme system in tobacco leaves.
Yan
Chong Ling
CL
School of Life Sciences, Xiamen University, Xiamen 361005.
Lin
Peng
P
Wang
Xiao Rong
XR
D002104:Cadmium / Q000633:toxicity*; D002374:Catalase / Q000378:metabolism; D004789:Enzyme Activation / Q000187:drug effects; D007854:Lead / Q000633:toxicity*; D008628:Mercury / Q000633:toxicity*; D018515:Plant Leaves / Q000187:drug effects* / Q000201:enzymology*; D012989:Soil Pollutants / Q000633:toxicity; D013482:Superoxide Dismutase / Q000378:metabolism; D014026:Nicotiana / Q000187:drug effects* / Q000201:enzymology*
D012989:Soil Pollutants; D002104:Cadmium; D007854:Lead; D002374:Catalase; D013482:Superoxide Dismutase; D008628:Mercury