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	Responses of a marine red tide alga Skeletonema costatum (Bacillariophyceae) to long-term UV radiation exposures
	Wu, Hongyan（Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China） ; Gao, Kunshan ; Gao KS(高坤山) ; Wu, Haiyan（Shantou Univ, Inst Marine Biol, Shantou 515063, Guangdong, Peoples R China）
	2009-02-09
关键词	Growth rate Photosynthesis UV UV-absorbing compounds Skeletonema costatum
英文摘要	UV radiation (280-400 nm) is known to affect phytoplankton in negative, neutral and positive ways depending on the species or levels of irradiation energy. However, little has been documented on how photosynthetic physiology and growth of red tide alga respond to UVR in a long-term period. We exposed the cells of the marine red tide diatom Skeletonema costatum for 6 days to simulated solar radiations with UV-A (320-400 nm) or UV-A + UV-B (295-400 nm) and examined their changes in photosynthesis and growth. Presence of UV-B continuously reduced the effective photosynthetic quantum yield of PSII, and resulted in complete growth inhibition and death of cells. When UV-B or UV-B + UV-A was screened off, the growth rate decreased initially but regained thereafter. UV-absorbing compounds and carotenoids increased in response to the exposures with UVR. However, mechanisms for photoprotection associated with the increased carotenoids or UV-absorbing compounds were not adequate under the continuous exposure to a constant level of UV-B (0.09 W m(-2), DNA-weighted). In contrast, under solar radiation screened off UV-B, the photoprotection was first accomplished by an initial increase of carotenoids and a later increase in UV-absorbing compounds. The overall response of this red tide alga to prolonged UV exposures indicates that S. costatum is a UV-B-sensitive species and increased UV-B irradiance would influence the formation of its blooms. (C) 2008 Elsevier B.V. All rights reserved.; National Natural Science Foundation of China [90411018, 40573059]; Natural Science Foundation of Guangdong Province [5300896]
语种	英语
出版者	ELSEVIER SCIENCE SA
内容类型	期刊论文
源URL	[http://dx.doi.org/doi:10.1016/j.jphotobiol.2008.10.005]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Wu, Hongyan,Gao, Kunshan,Gao KS,et al. Responses of a marine red tide alga Skeletonema costatum (Bacillariophyceae) to long-term UV radiation exposures[J],2009.
APA	Wu, Hongyan,Gao, Kunshan,高坤山,&Wu, Haiyan.(2009).Responses of a marine red tide alga Skeletonema costatum (Bacillariophyceae) to long-term UV radiation exposures..
MLA	Wu, Hongyan,et al."Responses of a marine red tide alga Skeletonema costatum (Bacillariophyceae) to long-term UV radiation exposures".(2009).

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