[Response of some protective enzymes in Brassica chinensis seedlings to Pb2+, Cd2+ and Cr6+ stresses].
Seedlings of Brassica chinensis were cultured in 1/2 Hoagland solution for seven days before they were treated with Pb2+, Cd2+ and Cr6+. The activities of their superoxide dismutase (SOD), peroxidase (POD) and catalase (CAT) responded to the increasing concentrations of the metals, and the responsive characters varied with different metals and different durations of metal treatments. CAT activity decreased with the increase of metal concentrations, and the order of its sensitivity to the three metals was Cd2+ > Cr6+ > Pb2+. SOD activity followed a rise-fall pattern along metal concentration gradient, but its sensitivity decreased with the duration of metal treatment. There was an obvious difference in POD activity to different metals, only when the treatment was proceeded for a period of time.
Ren
Anzhi
A
Department of Biology, Nankai University, Tianjin 300071. razn@eyou.com
Gao
Yubao
Y
Liu
Shuang
S
D001937:Brassica / Q000187:drug effects* / Q000201:enzymology / Q000378:metabolism; D002104:Cadmium / Q000633:toxicity*; D002857:Chromium / Q000633:toxicity*; D007854:Lead / Q000633:toxicity*; D009195:Peroxidase / Q000378:metabolism; D013482:Superoxide Dismutase / Q000378:metabolism
D002104:Cadmium; D002857:Chromium; D007854:Lead; D009195:Peroxidase; D013482:Superoxide Dismutase