Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum

CORC > 厦门大学 > 海洋环境－已发表论文

	Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum
	Li, Y. ; Gao, K. ; Villafane, V. E. ; Helbling, E. W. ; Li Y(李炎)
刊名	http://dx.doi.org/10.5194/bg-9-3931-2012
	2012
关键词	CARBON CONCENTRATING MECHANISMS SOLAR ULTRAVIOLET-RADIATION HARMFUL ALGAL BLOOMS MARINE-PHYTOPLANKTON THALASSIOSIRA-PSEUDONANA EMILIANIA-HUXLEYI INORGANIC CARBON HETEROSIGMA-AKASHIWO ELEMENTAL RATIOS CLIMATE-CHANGE
英文摘要	National Basic Research Program of China [2009CB421207, 2011CB200902]; Program for Changjiang Scholars and Innovative Research Team [IRT0941]; National Natural Science Foundation [40930846, 41120164007]; MOST [S2012GR0290]; Consejo Nacional de Investigaciones Cientificas y Tecnicas-Argentina [PIP 12-201001-00228]; Ministry of Education of China; Increasing atmospheric CO2 concentration is responsible for progressive ocean acidification, ocean warming as well as decreased thickness of upper mixing layer (UML), thus exposing phytoplankton cells not only to lower pH and higher temperatures but also to higher levels of solar UV radiation. In order to evaluate the combined effects of ocean acidification, UV radiation and temperature, we used the diatom Phaeodactylum tricornutum as a model organism and examined its physiological performance after grown under two CO2 concentrations (390 and 1000 mu atm) for more than 20 generations. Compared to the ambient CO2 level (390 mu atm), growth at the elevated CO2 concentration increased non-photochemical quenching (NPQ) of cells and partially counteracted the harm to PS II (photosystem II) caused by UV-A and UV-B. Such an effect was less pronounced under increased temperature levels. The ratio of repair to UV-B induced damage decreased with increased NPQ, reflecting induction of NPQ when repair dropped behind the damage, and it was higher under the ocean acidification condition, showing that the increased pCO(2) and lowered pH counteracted UV-B induced harm. As for photosynthetic carbon fixation rate which increased with increasing temperature from 15 to 25 degrees C, the elevated CO2 and temperature levels synergistically interacted to reduce the inhibition caused by UV-B and thus increase the carbon fixation.
语种	英语
出版者	BIOGEOSCIENCES
内容类型	期刊论文
源URL	[http://dspace.xmu.edu.cn/handle/2288/87738]
专题	海洋环境－已发表论文
推荐引用方式 GB/T 7714	Li, Y.,Gao, K.,Villafane, V. E.,et al. Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum[J]. http://dx.doi.org/10.5194/bg-9-3931-2012,2012.
APA	Li, Y.,Gao, K.,Villafane, V. E.,Helbling, E. W.,&李炎.(2012).Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum.http://dx.doi.org/10.5194/bg-9-3931-2012.
MLA	Li, Y.,et al."Ocean acidification mediates photosynthetic response to UV radiation and temperature increase in the diatom Phaeodactylum tricornutum".http://dx.doi.org/10.5194/bg-9-3931-2012 (2012).