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
第一作者: Wang, Zhi
作者: Wang, Zhi;Xiao, Bangding;Song, Lirong;Wang, Chunbo;Zhang, Junqian;Wang, Zhi;Zhang, Junqian
作者机构:
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 )
ISSN:
年卷期:
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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.
分类号: TB1
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