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Chinese Journal of Applied Ecology ›› 2002, Vol. ›› Issue (4): 510-512.

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Response of some protective enzymes in Brassica chinensis seedlings to Pb2+, Cd2+ and Cr6+ stresses

REN Anzhi, GAO Yubao, LIU Shuang   

  1. Department of Biology, Nankai University, Tianjin 300071
  • Received:1999-03-11 Revised:1999-11-11 Online:2002-04-15

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. CATactivity 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 PODactivity to different metals, only when the treatment was proceeded for a period of time.

Key words: Brassica chinensis, Protective enzymes, Lead, Cadmium, Chromium

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