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	Growth and photosynthesis of a diatom grown under elevated CO2 in the presence of solar UV radiation
	Wu, Xiaojuan ; Gao, Guang ; Giordano, Mario ; Gao, Kunshan ; Gao KS(高昆山)
	2012-05
关键词	climate changes CCM CO2 photosynthesis sunlight UV
英文摘要	The combination of elevated CO2 and the increased acidity in surface oceans is likely to have an impact on photosynthesis via its effects on inorganic carbon speciation and on the overall energetics of phytoplankton. Exposure to UV radiation (UVR) may also have a role in the response to elevated CO2 and acidification, due to the fact that UVR may variously impact on photosynthesis and because of the energy demand of UVR defense. The cell may gain energy by down-regulating the CO2 concentrating mechanism, which may lead to a greater ability to cope with UVR and/or higher growth rates. In order to clarify the interplay of cell responses to increasing CO2 and UVR, we investigated the photosynthetic response of the marine and estuarine diatom Cylindrotheca closterium f. minutissima cultured at either 390 (ambient) or 800 (elevated) ppmv CO2, while exposed to solar radiation with or without UVR (UVR, 280-400 nm). After a 6 day acclimation period, the growth rate of cells was little affected by elevated CO2 and no obvious correlation with the radiation dose (for both PAR and PAR + UV treatments) could be detected. However, the relative electron transport rate was reduced and was more sensitive to UVR in cells maintained at elevated CO2 as compared to cells cultured at ambient CO2. The CO2 concentrating mechanism was down regulated at 800 ppmv CO2, but was apparently not completely switched off. These data are discussed with respect to their significance in the context of global climate change.; National Basic Research Program of China [2009CB421207, 2011CB200902]; Program for Changjiang Scholars and Innovative Research Team [IRT0941]; National Natural Science Foundation [40930846, 41120164007]; China-Japan collaboration project from MOST [S2012GR0290]; Ministry of Education of China; Fondazione Cariverona, Italy; Ministero per le Politiche Agricole e Forestali (MIPAF), Bioforme project
语种	英语
出版者	E SCHWEIZERBARTSCHE VERLAGS
内容类型	期刊论文
源URL	[http://dx.doi.org/10.1127/1863-9135/2012/0299]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Wu, Xiaojuan,Gao, Guang,Giordano, Mario,et al. Growth and photosynthesis of a diatom grown under elevated CO2 in the presence of solar UV radiation[J],2012.
APA	Wu, Xiaojuan,Gao, Guang,Giordano, Mario,Gao, Kunshan,&高昆山.(2012).Growth and photosynthesis of a diatom grown under elevated CO2 in the presence of solar UV radiation..
MLA	Wu, Xiaojuan,et al."Growth and photosynthesis of a diatom grown under elevated CO2 in the presence of solar UV radiation".(2012).

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