Effects of chitosan on growth of an aquatic plant (Hydrilla verticillata) polluted waters with different chemical oxygen demands |
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作者姓名: | XU Qiu-jin NIAN Yue-gang JIN Xiang-can YAN Chang-zhou LIU Jin Jiang Gao-ming |
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作者单位: | [1]Lake Research Center, Chinese Research Academy of Environmental Sciences, Beijing 100012, China [2]Quantitative Vegetation Ecology Institute of Botany, Chinese Academy of Sciences, Beijing 100093, China |
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基金项目: | Project supported by the National Basic Research Program of China (No.2002CB412307) and the Hi-Tech Research and Development Program (863) of China (No. 2002AA601013).Acknowledgements: The authors are indebted to Professor Zheng-wen Liu for his suggestions and comments. |
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摘 要: | Effects of chitosan on a submersed plant, HydriUa verticillata, were investigated. Results indicated that H. verticillata could prevent ultrastructure phytotoxicities and oxidativereaction from polluted water with high chemical oxygen demand (COD). Superoxide dismutase (SOD) activity and malondialdehyde (MDA) contents in H. verticillata treated with 0.1% chitosan in wastewater increased with high COD (980 rag/L) and decreased with low COD (63 mg/L), respectively. Ultrastructural analysis showed that the stroma and grana of chloroplast basically remained normal. However, plant ceils from the control experiment (untreated with chitosan) were vacuolated and the cell interval increased. The relict of protoplast moved to the center, with cells tending to disjoint. Our findings indicate that wastewater with high COD concentration can cause a substantial damage to submersed plant, nevertheless, chitosan probably could alleviate the membrane lipid peroxidization and ultrastructure phytotoxicities, and protect plant cells from stress of high COD concentration polluted water.
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关 键 词: | 壳聚糖 水生植物 水污染 化学制品 |
收稿时间: | 2006-02-06 |
修稿时间: | 2006-07-04 |
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