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学科主题: Plant Sciences; Environmental Sciences
题名: Carbon and nitrogen metabolism of an eutrophication tolerative macrophyte, Potamogeton crispus, under NH4+ stress and low light availability
作者: Cao, Te1; Xie, Ping1; Ni, Leyi1; Zhang, Meng1; Xu, Jun1
通讯作者: Ni, LY, Chinese Acad Sci, Inst Hydrobiol, Donghu Expt Stn Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
关键词: Eutrophication ; Ammonium toxicity ; Carbohydrate ; Free amino acids ; Macrophyte
刊名: ENVIRONMENTAL AND EXPERIMENTAL BOTANY
发表日期: 2009-04-01
DOI: 10.1016/j.envexpbot.2008.10.004
卷: 66, 期:1, 页:74-78
收录类别: SCI
文章类型: Article
部门归属: [Cao, Te; Xie, Ping; Ni, Leyi; Zhang, Meng; Xu, Jun] Chinese Acad Sci, Inst Hydrobiol, Donghu Expt Stn Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
资助者: NSFC [30570280]; National Basic Research Program of China [2002CB412300]
类目[WOS]: Plant Sciences ; Environmental Sciences
研究领域[WOS]: Plant Sciences ; Environmental Sciences & Ecology
摘要: Submersed macrophytes in eutrophic lakes often experience high NH4+ concentration and low light availability in the water column. This study found that an NH4+-N concentration of 1 mgL(-1) in the water column apparently caused physiological stress on the macrophyte Potamogeton crispus; L The plants accumulated free amino acids (FAA) and lost soluble carbohydrates (SC) under NH4+ stress. These stressful effects of NH4+ were exacerbated under low light availability. Shading significantly increased NH4+ and FAA contents and dramatically decreased SC and starch contents in the plant shoots. At an NH4+-N concentration of 1 mg L-1 in the water column, neither growth inhibition nor NH4+ accumulation was observed in the plant tissues of P. crispus under normal light availability. The results showed that 1 mg L-1 NH4+-N in the water column was not toxic to P. crispus in a short term. To avoid NH4+ toxicity. active NH4+ transportation out of the cell may cost energy and thus result in a decline of carbohydrate. When NH4+ inescapably accumulates in the plant cell, i.e. under NH4+ Stress and shading, NH4+ is scavenged by FAA synthesis. (c) 2009 Published by Elsevier B.V.
英文摘要: Submersed macrophytes in eutrophic lakes often experience high NH4+ concentration and low light availability in the water column. This study found that an NH4+-N concentration of 1 mgL(-1) in the water column apparently caused physiological stress on the macrophyte Potamogeton crispus; L The plants accumulated free amino acids (FAA) and lost soluble carbohydrates (SC) under NH4+ stress. These stressful effects of NH4+ were exacerbated under low light availability. Shading significantly increased NH4+ and FAA contents and dramatically decreased SC and starch contents in the plant shoots. At an NH4+-N concentration of 1 mg L-1 in the water column, neither growth inhibition nor NH4+ accumulation was observed in the plant tissues of P. crispus under normal light availability. The results showed that 1 mg L-1 NH4+-N in the water column was not toxic to P. crispus in a short term. To avoid NH4+ toxicity. active NH4+ transportation out of the cell may cost energy and thus result in a decline of carbohydrate. When NH4+ inescapably accumulates in the plant cell, i.e. under NH4+ Stress and shading, NH4+ is scavenged by FAA synthesis. (c) 2009 Published by Elsevier B.V.
关键词[WOS]: FREE AMINO-ACIDS ; SUBMERSED MACROPHYTE ; AMMONIUM TOXICITY ; PLANTS ; GROWTH ; ACCUMULATION ; DECLINE ; MECHANISM ; NITRATE ; LAKES
语种: 英语
WOS记录号: WOS:000265127100011
ISSN号: 0098-8472
Citation statistics:
内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/152342/7784
Appears in Collections:中科院水生所知识产出(2009年前)_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, Donghu Expt Stn Lake Ecosyst, State Key Lab Freshwater Ecol & Biotechnol, Wuhan 430072, Peoples R China

Recommended Citation:
Cao, Te; Xie, Ping; Ni, Leyi; Zhang, Meng; Xu, Jun.Carbon and nitrogen metabolism of an eutrophication tolerative macrophyte, Potamogeton crispus, under NH4+ stress and low light availability,ENVIRONMENTAL AND EXPERIMENTAL BOTANY,2009,66(1):74-78
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