Oxidative stress induced by lead in chloroplast of spinach

Biological Trace Element Research
Xiao WuHong Fashui

Abstract

Seedlings of spinach were grown in Hoagland's medium containing 0, 20, 40, 60, 80, 100 microM PbCl2, respectively, for 4 weeks. Chloroplasts were assayed for overproduction of reactive oxygen species (ROS) such as superoxide radicals (O2(*-)) and hydrogen peoxide (H2O2) and of lipid peroxide (malonyldialdehyde) and for activities of the antioxidant enzymes such as superoxide dismutase, catalase, ascorbate peroxidase, and guaiacol peroxidase and glutathione content, oxygen-evolving rate, and chlorophyll content. Increase in both ROS and lipid peroxide content and reduction in photosynthesis and activities of the antioxidant defense system indicated that spinach chloroplast underwent a stress condition due to an oxidative attack. Seedling growth cultivated in containing Pb2+ media was significantly inhibited. The results imply that spinach chloroplast was not able to tolerate the oxidative stress induced by Pb2+ due to having no effective antioxidant defense mechanism.

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Citations

Dec 5, 2008·Biological Trace Element Research·Ling Qufei, Hong Fashui
Sep 26, 2013·Biological Trace Element Research·Shengman WangXiaohua Huang
Mar 4, 2010·BMC Plant Biology·Wusheng Jiang, Donghua Liu
Oct 12, 2010·Ecotoxicology and Environmental Safety·Chengrun WangJian Sun

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