title: [Response of some protective enzymes in Brassica chinensis seedlings to Pb2+, Cd2+ and Cr6+ stresses].
abstract: 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.
authors.affiliation: Department of Biology, Nankai University, Tianjin 300071. razn@eyou.com
authors.forename: Anzhi
authors.initials: A
authors.lastname: Ren
authors.forename: Yubao
authors.initials: Y
authors.lastname: Gao
authors.forename: Shuang
authors.initials: S
authors.lastname: Liu
mesh_terms: 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
chemical_list: D002104:Cadmium; D002857:Chromium; D007854:Lead; D009195:Peroxidase; D013482:Superoxide Dismutase