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| Effects of Mn and Cd and Their Combination on Growth and Physiological and Biochemical Characteristics of Elodea nutttallii |
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| KeyWord:Mn2+; Cd2+; combined stress; Elodea nutttallii; growth; physiological and biochemical characteristics |
| Author Name | Affiliation | | LONG Rui | School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China | | ZHANG Ming | School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China | | ZHANG Guang-sheng | School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China | | CHENG Xiao-ying | School of Environmental and Civil Engineering, Jiangnan University, Wuxi 214122, China |
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| Abstract: |
| Elodea nutttallii, an aquatic plant, has showed potential for ecological restoration of polluted water. Here, we examined chlorophyll, soluble protein, malondialdehyde（MDA）, hydrogen peroxide（H2O2）, and superoxide anion（O-2·）contents, and superoxide dismutase（SOD）, peroxidase（POD）and catalase（CAT））activities in Elodea nutttallii under different Mn2+ and Cd2+ stresses for 7 days. Low concentrations of Mn2+ promoted contents of chlorophyll, soluble protein, MDA, H2O2 and O-2·, and stimulated activities of antioxidant enzymes. Under high concentrations of Mn2+, the chlorophyll and soluble protein contents and POD and CAT activities decreased, while MDA, H2O2 and O-2· contents and SOD activity increased. Under Cd2+ stresses, the chlorophyll and soluble protein contents decreased, showing a dose-response relationship; whereas MDA, H2O2 and O-2· significantly increased the activities of antioxidant enzymes at low Cd2+ stresses but decreased at high Cd2+ concentrations. The CAT activity was greatest at 0.01 mg Cd·L-1, while the activities of SOD and POD were highest at 1 mg Cd·L-1. Compared with POD and CAT, SOD played greater protection under high concentrations of heavy metals. The combined effects of Mn2+ and Cd2+ on the plant were greater than their single. The synergy effects of Mn2+ and Cd2+ were observed under the high Mn2+ concentrations. In conclusion, Cd has greater stresses than Mn2+ on the physiological and biochemical characteristics of the plant. Elodea nutttallii shows poorer resistance to Cd2+ than Mn2+ stresses. |
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