Ammonium, microcystins, and hypoxia of blooms in eutrophic water cause oxidative stress and C-N imbalance in submersed and floating-leaved aquatic plants in Lake Taihu, China
文献类型：期刊论文
| 作者 | Zhang, Meng1,2; Wang, Zhengqi3; Xu, Jun1; Liu, Yaqin1; Ni, Leyi1; Cao, Te1; Xie, Ping1 |
| 刊名 | CHEMOSPHERE
 |
| 出版日期 | 2011 |
| 卷号 | 82期号:3页码:329-339 |
| 关键词 | NH4+ Microcystins Hypoxia Antioxidant activity C-N balance Aquatic macrophytes |
| ISSN号 | 0045-6535 |
| 通讯作者 | Ni, LY, Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China ; Nily@ihb.ac.cn, caote@ihb.ac.cn |
| 中文摘要 | The heavy bloom of cyanobacteria is a disastrous consequence of freshwater eutrophication, and the bloom is highly toxic due to its secondary metabolites called microcystins (MCs). The release of organic substances from dense blooms causes an increase in NH4+ and decrease in oxygen in lake water. In the present study, the dynamics of physio-biochemical responses of five aquatic macrophytes to MCs and NH4+ stresses in Meiliang Bay were evaluated. The bay is one of the most seriously eutrophized areas dominated by the toxic cyanobacteria of Lake Taihu, China. The results demonstrate that aquatic macrophytes in Meiliang Bay are subjected to successive external stresses. From January to May, they are subjected to high NH4+ stress (>0.56 mg L-1), whereas from June to September or during dense blooms, the macrophytes experience both MC proliferation and moderate NW, toxicity (>0.3 mg L-1). In August, high NH4+ stress occurs along with hypoxia stress, whereas from September to December, the macrophytes experience moderate NH4+ stress, causing a serious imbalance in C-N metabolism and oxidative stress. Between the two aquatic plant life forms, floating-leaved plants are more resistant to the stresses of eutrophication than are submersed plants. Elevated MCs in the water column can aggravate oxidative stress and suppress the soluble protein contents of aquatic plants. High NH4+ in the water causes severe C and N imbalance in submersed macrophytes because of considerable carbon consumption for free amino acid synthesis. The superoxide dismutase activities of submersed macrophytes are suppressed by low light penetrating the eutrophic water, which might impair the antioxidative function of the plants. The findings of this study provide mainly field evidence that reveals the physical, chemical, and biological stresses on aquatic plants in bloom-prevailed eutrophic lakes. (C) 2010 Elsevier Ltd. All rights reserved. |
| 英文摘要 | The heavy bloom of cyanobacteria is a disastrous consequence of freshwater eutrophication, and the bloom is highly toxic due to its secondary metabolites called microcystins (MCs). The release of organic substances from dense blooms causes an increase in NH4+ and decrease in oxygen in lake water. In the present study, the dynamics of physio-biochemical responses of five aquatic macrophytes to MCs and NH4+ stresses in Meiliang Bay were evaluated. The bay is one of the most seriously eutrophized areas dominated by the toxic cyanobacteria of Lake Taihu, China. The results demonstrate that aquatic macrophytes in Meiliang Bay are subjected to successive external stresses. From January to May, they are subjected to high NH4+ stress (>0.56 mg L-1), whereas from June to September or during dense blooms, the macrophytes experience both MC proliferation and moderate NW, toxicity (>0.3 mg L-1). In August, high NH4+ stress occurs along with hypoxia stress, whereas from September to December, the macrophytes experience moderate NH4+ stress, causing a serious imbalance in C-N metabolism and oxidative stress. Between the two aquatic plant life forms, floating-leaved plants are more resistant to the stresses of eutrophication than are submersed plants. Elevated MCs in the water column can aggravate oxidative stress and suppress the soluble protein contents of aquatic plants. High NH4+ in the water causes severe C and N imbalance in submersed macrophytes because of considerable carbon consumption for free amino acid synthesis. The superoxide dismutase activities of submersed macrophytes are suppressed by low light penetrating the eutrophic water, which might impair the antioxidative function of the plants. The findings of this study provide mainly field evidence that reveals the physical, chemical, and biological stresses on aquatic plants in bloom-prevailed eutrophic lakes. (C) 2010 Elsevier Ltd. All rights reserved. |
| WOS标题词 | Science & Technology ; Life Sciences & Biomedicine |
| 学科主题 | Environmental Sciences |
| 类目[WOS] | Environmental Sciences |
| 研究领域[WOS] | Environmental Sciences & Ecology |
| 关键词[WOS] | MACROPHYTE VALLISNERIA-NATANS ; FREE AMINO-ACIDS ; DIFFERENT TROPHIC LEVELS ; ALFALFA MEDICAGO-SATIVA ; CYANOBACTERIAL TOXINS ; SUPEROXIDE-DISMUTASE ; PHRAGMITES-AUSTRALIS ; CERATOPHYLLUM-DEMERSUM ; BIOCHEMICAL RESPONSES ; PHYSIOLOGICAL STRESS |
| 收录类别 | SCI |
| 资助信息 | National Natural Science Foundation of China [30800146]; National Basic Research Project of China [2008CB418000] |
| 语种 | 英语 |
| WOS记录号 | WOS:000286493800005 |
| 公开日期 | 2011-04-14 |
| 源URL | [http://ir.ihb.ac.cn/handle/342005/15466]  |
| 专题 | 水生生物研究所_淡水生态学研究中心_期刊论文 |
| 作者单位 | 1.Chinese Acad Sci, Inst Hydrobiol, State Key Lab Freshwater Ecol & Biotechnol China, Donghu Expt Stn Lake Ecosyst, Wuhan 430072, Peoples R China 2.Jiangxi Acad Environm Sci, Nanchang, Peoples R China 3.Amer Hach Co, Shanghai Representat Off, Shanghai, Peoples R China |
| 推荐引用方式 GB/T 7714 | Zhang, Meng,Wang, Zhengqi,Xu, Jun,et al. Ammonium, microcystins, and hypoxia of blooms in eutrophic water cause oxidative stress and C-N imbalance in submersed and floating-leaved aquatic plants in Lake Taihu, China[J]. CHEMOSPHERE,2011,82(3):329-339. |
| APA | Zhang, Meng.,Wang, Zhengqi.,Xu, Jun.,Liu, Yaqin.,Ni, Leyi.,...&Xie, Ping.(2011).Ammonium, microcystins, and hypoxia of blooms in eutrophic water cause oxidative stress and C-N imbalance in submersed and floating-leaved aquatic plants in Lake Taihu, China.CHEMOSPHERE,82(3),329-339. |
| MLA | Zhang, Meng,et al."Ammonium, microcystins, and hypoxia of blooms in eutrophic water cause oxidative stress and C-N imbalance in submersed and floating-leaved aquatic plants in Lake Taihu, China".CHEMOSPHERE 82.3(2011):329-339. |
入库方式： OAI收割
来源：水生生物研究所
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