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| Effects of Manganese Contamination on Activities of Antioxidant Enzyme Systems in Leaves of Schima superba |
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| KeyWord:manganese contamination; Schima superba; activity of antioxidant enzyme system |
| Author Name | Affiliation | | SU Yin-ping | School of Environment and Resource, Guangxi Normal University, Guilin 541004, China | | LIU Hua | School of Environment and Resource, Guangxi Normal University, Guilin 541004, China | | YU Fang-ming | School of Environment and Resource, Guangxi Normal University, Guilin 541004, China
Guangxi Key Laboratory of Environmental pollution control theory and technique, Guilin 541004, China | | LI Yi | School of Environment and Resource, Guangxi Normal University, Guilin 541004, China
Guangxi Key Laboratory of Environmental pollution control theory and technique, Guilin 541004, China | | CHEN Meng-lin | School of Environment and Resource, Guangxi Normal University, Guilin 541004, China
Guangxi Key Laboratory of Environmental pollution control theory and technique, Guilin 541004, China | | ZHOU Zhen-ming | School of Environment and Resource, Guangxi Normal University, Guilin 541004, China
Guangxi Key Laboratory of Environmental pollution control theory and technique, Guilin 541004, China | | LI Ming-shun | School of Environment and Resource, Guangxi Normal University, Guilin 541004, China
Guangxi Key Laboratory of Environmental pollution control theory and technique, Guilin 541004, China |
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| Abstract: |
| Manganese（Mn） is essential for plant growth, but excess Mn may impact antioxidant enzyme systems in plant. A soil culture experiment was performed to explore the effects of Mn contamination on various enzymatic antioxidants and non-enzymatic antioxidants in the leaves of Schima superba. Soil samples, collected from unmining section（WK）, prospecting area（T）, restored area（H）, mining（K） and tailings（W） in a manganese mine of Hezhou, were used as Mn-polluted soils, and an unpolluted soil from Guilin, Guangxi was used as control（CK）. After 145-d of culture, leaves of S. superba were sampled and analyzed for the activities of superoxide dismutase（SOD）, peroxidase（POD）, catalase（CAT）, and ascorbate peroxidase（APX） and the contents of ascorbic acid（AsA）, glutathione（GSH），phytochelatins（PCs），total acid soluble SH，malondialdehyde（MDA）, hydrogen peroxide（H2O2）, and the produce rate of superoxide anion（Ｏ－2·）. Concentrations of Mn in roots, stems, and leaves increased with soil Mn concentrations. Compared to the control, plant biomass increased in WK and T samples, whereas decreased in the other soils, indicating stimulation of S. superba growth by Mn at low concentrations. The rate of Ｏ－2·production in the leaves was significantly higher in H than in control（P<0.05）. The contents of H2O2 in leaves were increased by 65.7% and 96.3% for K and W, respectively. The leaf MDA was significantly（P<0.05） higher in mineral soils than in control, showing that the leaves were damaged by Mn pollution. The activities or contents of SOD, POD, AsA and GSH increased in order of CK |
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