Effects of Zinc on Root Morphology and Antioxidant Adaptations of Cadmium-Treated Sedum alfredii H. |
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| Authors: | Xiao-Fen Jin Dan Liu Ejazul Islam Qaisar Mahmood Xiao-E Yang Zhen-Li He |
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| Institution: | 1. Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Natural Resources Science , Zhejiang University , Hangzhou, China;2. Ministry of Education Key Laboratory of Environmental Remediation and Ecosystem Health, College of Environmental and Natural Resources Science , Zhejiang University , Hangzhou, China;3. School of Tourism and Health , Zhejiang Forestry College , Lin'an, China;4. Indian River Research and Education Center , University of Florida , Fort Pierce, Florida, USA |
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| Abstract: | ABSTRACT The study demonstrated S. alfredii is an excellent cadmium (Cd)/zinc (Zn) hyperaccumulator as Cd and Zn concentrations in leaves reached 2,183 and 13,799 mg kg?1 DW, respectively. There was a significant increase in root morphological parameters induced by 50 and 500 μM Zn supplement; however, a sharp decrease in these parameters occurred when treated with 100 μM Cd +1000 μM Zn. The inhibited root dehydrogenase activity in 100 μM Cd treated plants was restored to control levels when supplemented with 500 μM Zn. Moderate Zn supplement did not produce significant changes in (malondialdehyde) MDA concentrations as compared with those treated with Cd alone. Variations of the antioxidative enzymes proved an ineffective role in coping with metal-stress in S. alfredii. Combined Cd and Zn treatment significantly enhanced ascorbic acid (AsA) and glutathione (GSH) contents in leaves of S. alfredii, as compared with those treated with Cd alone. Thus, Zn may rely on the involvement of GSH in detoxification and tolerance. |
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| Keywords: | antioxidatant ascorbate glutathione hyperaccumulation zinc-cadmium interaction |
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