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题名: Toxicity-associated changes in the invasive cyanobacterium Cylindrospermopsis raciborskii in response to nitrogen fluctuations
作者: Yang, Yiming1, 2; Chen, Youxin1, 2; Cai, Fangfang1, 2; Liu, Xiang1; Wang, Yilang1, 2; Li, Renhui1
关键词: Cylindrospermopsis raciborskii ; Nitrogen ; Nutrient fluctuation ; Growth ; Cylindrospermopsin
刊名: ENVIRONMENTAL POLLUTION
发表日期: 2018-06-01
DOI: 10.1016/j.envpol.2017.11.024
卷: 237, 页:1041-1049
收录类别: SCI
文章类型: Article
WOS标题词: Science & Technology ; Life Sciences & Biomedicine
类目[WOS]: Environmental Sciences
研究领域[WOS]: Environmental Sciences & Ecology
英文摘要: The cyanobacterium Cylindrospermopsis raciborskii is of particular concern due to its ability to fix nitrogen (N), sporadic bloom, potential toxicity and apparent invasiveness. However, the toxicity associated behavior and response of toxic C raciborskii under N fluctuations in water have been poorly investigated. The present study initiated based on the field survey in which Cylindrospermopsis species was found to have a high fitness under nitrate concentrations fluctuating from 0.02 mg L-1 to 2.90 mg L-1 in Chinese freshwater lakes. Examination on the role of short-term N fluctuations was conducted in two C. raciborskii strains which were exposed to a range of N concentrations supplied in two patterns, namely one-time pattern and ten-time pattern in which the equal amount of N was divided into ten-time accretions. The results showed the growth of both strains were not vulnerable to the transient nutrient fluctuations. The toxic strain showed considerable toxicological flexibility with the highest yield of cylindrospermopsin (CYN) obtained in the absence of N and the lowest in full medium. Generally, larger amounts of total CYN were observed at lower N levels, indicating that N deficiency promoted the intracellular accumulation and simultaneously restrained the extracellular release of CYN. Furthermore, CYN production was significantly different in two N supply patterns. The maximum quotas of intracellular and extracellular CYN in one-time pattern were respectively 2.79-3.53 and 3.94-7.20 times higher compared to the ten-time pattern. To our knowledge, our results are the first evidence of toxicity variations of C. raciborskii to the impermanent N fluctuations, shedding new light on its toxicological plasticity. (C) 2017 Elsevier Ltd. All rights reserved.
关键词[WOS]: BLOOM-FORMING CYANOBACTERIUM ; SUBTROPICAL WATER RESERVOIR ; PHOSPHATE FLUCTUATIONS ; HARMFUL CYANOBACTERIA ; TOXIN PRODUCTION ; CLIMATE-CHANGE ; GREEN-ALGAE ; SUBBA RAJU ; LAKE ; GROWTH
语种: 英语
项目资助者: National Key Research and Development Program of China(2017YFA0605201) ; National Natural Science Foundation of China(31470310)
WOS记录号: WOS:000431158900106
ISSN号: 0269-7491
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内容类型: 期刊论文
URI标识: http://ir.ihb.ac.cn/handle/342005/50861
Appears in Collections:藻类生物学及应用研究中心_期刊论文

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作者单位: 1.Chinese Acad Sci, Inst Hydrobiol, Key Lab Algal Biol, Wuhan 430072, Hubei, Peoples R China
2.Univ Chinese Acad Sci, Beijing 100049, Peoples R China
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