Journal
CHEMOSPHERE
Volume 84, Issue 1, Pages 63-69Publisher
PERGAMON-ELSEVIER SCIENCE LTD
DOI: 10.1016/j.chemosphere.2011.02.054
Keywords
Calcium; Cadmium; Hyperaccumulator; Oxidative stress; Root; Sedum alfredii
Categories
Funding
- National Natural Science Foundation of China [31000935]
- Ministry of Environmental Protection of China [2011467057]
- Ministry of Science of China [2009AA06Z316]
- China Postdoctoral Science Foundation [20100471733]
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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. (C) 2011 Elsevier Ltd. All rights reserved.
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