Calcium protects roots of Sedum alfredii H. against cadmium-induced oxidative stress |
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Authors: | Tian Shengke Lu Lingli Zhang Jie Wang Kai Brown Patrick He Zhenli Liang Jun Yang Xiaoe |
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Institution: | a MOE Key Laboratory of Environment Remediation and Ecosystem Health, College of Environmental and Resources Science, Zhejiang University, Huajiachi Campus, Hangzhou 310029, China b University of Florida, Institute of Food and Agricultural Science, Indian River Research and Education Center, Fort Pierce, FL 34945, USA c Department of Plant Sciences, University of California, Davis, CA 95616, USA |
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Abstract: | Sedum alfredii is a well-known Cd (cadmium) hyperaccumulator native to China. The impacts of exogenous Ca on Cd-induced oxidative stress and antioxidant systems in roots of S. alfredii were investigated by using cellular and biochemical approaches. Supplementation of the medium with higher Ca levels resulted in alleviated growth inhibition and decreased Cd concentration, as well as increased Ca concentration in roots. Cadmium induced lipid peroxidation and loss of plasma membrane integrity, reactive oxygen species overproduction, as well as ultrastructural changes of root cells were largely reversed by Ca supplementation in the medium. Calcium application significantly altered the Cd effects on antioxidant enzymes and non-enzyme antioxidants (non-protein thiols), and significantly increased glutathione (GSH) biosynthesis. The results suggest that Ca is able to protect the roots of S. alfredii against Cd toxicity by restoration of Cd-displaced Ca, alleviation of the metal induced oxidative stress, as well as promotion of GSH biosynthesis. |
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Keywords: | Calcium Cadmium Hyperaccumulator Oxidative stress Root Sedum alfredii |
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