Effects of Pb on physiological mechanisms in wheat
CHAO Lei1, ZHOU Qi-xing1,2, CHEN Su1,3, CUI Shuang1
1. Key Laboratory of Terrestrial Ecological Process, Institute of Applied Ecology, Chinese Academy of Sciences, Shenyang 110016, China; 2. College of Environmental Science and Engineering, NanKai University, Tianjin 300071, China; 3. Key Laboratory of Environment Engineering of Shenyang University, Shenyang 110044, China
Changes in the activity of antioxidant enzymes including peroxidases (POD) and superoxide dismutases (SOD) and in the contents of chlorophyll (CHL),malondialdehyde (MDA),and soluble proteins (SP) in wheat (Triticum aestivum L) under the stress of Pb in soil were examined. The results showed a decrease of chlorophyll content in the leaves,and the concentrations of MDA and SOD level were not significantly increased. The POD activity could be induced to increase under the stress of Pb. The inhibition of protein biosynthesis by Pb was one of the toxic mechanisms involved. The activity of POD and SOD,contents of MDA and CHL could not be considered as biomarkers of stress by Pb in soil. While the contents of SP could be considered as biomarkers of stress by Pb in soil.
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