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Responses and toxin bioaccumulation in duckweed (Lemna minor) under microcystin-LR, linear alkybenzene sulfonate and their joint stress

文献类型： 外文期刊

作者： Wang, Zhi 1 ; Xiao, Bangding 1 ; Song, Lirong 1 ; Wang, Chunbo 1 ; Zhang, Junqian 1 ;

作者机构： 1.Chinese Acad Sci, Inst Hydrobiol, Wuhan 430072, Hubei, Peoples R China

2.Jiangsu Acad Agr Sci, Inst Agr Resource & Environm Sci, Nanjing 210014, Peoples R China

关键词： microcystins;linear alkylbenzene sulfonate;accumulation;superoxide dismutase;aquatic plants

期刊名称：JOURNAL OF HAZARDOUS MATERIALS （ 影响因子：10.588； 五年影响因子：10.129 ）

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收录情况： SCI

摘要： Microcystin-LR (MCLR) and linear alkylbenzene sulfonate (LAS) are commonly found in eutrophic lakes due to toxic cyanobacterial blooms and exogenous organic compounds pollution. However, the ecotox-icological risk of their combination in the aquatic environment is unknown. This study investigated the effects of MCLR, LAS and their mixture on duckweed {Lemna minor) growth and physiological responses. MCLR accumulation in duckweed, with or without LAS, was also examined. Growth of duckweed and chlorophyll-a contents were significantly reduced after 8 d exposure to high concentrations of MCLR (≥3 μg/ml), LAS (≥20 μg/ml) and their mixture (≥3 + 10 μg/ml). After 2d of exposure, superoxide dis-mutase activity and glutathione content in duckweed increased with increasing concentrations of MCLR, LAS and their mixture, with a significant difference observable after 8d of exposure. When MCLR and LAS concentrations were lower (≤0.1 +1 μg/ml), the interaction of them is synergistic, but when the concentrations were higher, the synergy was weak. MC accumulation was much higher at 2 d than at 8 d when duckweed was exposed to lower concentrations of MCLR (≤3 μg/ml) or MCLR-LAS (≤3 + 10 μg/ml). Furthermore, LAS significantly enhanced the accumulation of MCLR in duckweed, even with LAS concentrations as low as 0.3 μg/ml (environmental concentration), indicating that greater negative ecological risks and higher MCLR phytoremediation potentials of duckweed might occur in MCLR-LAS-concomitant water.

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