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Alleviation of solar ultraviolet radiation (UVR)-induced photoinhibition in diatom Chaetoceros curvisetus by ocean acidification

Published online by Cambridge University Press:  22 October 2014

Heng Chen ,
Wanchun Guan ,
Guoquan Zeng ,
Ping Li  and
Shaobo Chen
Heng Chen
Affiliation:
Department of Marine Science, School of Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
Wanchun Guan*
Affiliation:
Department of Marine Science, School of Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang 325035, China
Guoquan Zeng
Affiliation:
Zhejiang Mariculture Research Institute, Wenzhou 325005, China
Ping Li
Affiliation:
Marine Biology Institute, Shantou University, Shantou, Guangdong 515063, China
Shaobo Chen
Affiliation:
Zhejiang Mariculture Research Institute, Wenzhou 325005, China
*
Correspondence should be addressed to:G. Wanchun, Department of Marine Science, School of Life Sciences, Wenzhou Medical University, Wenzhou, Zhejiang, 325035, China. email: gwc@wmu.edu.cn
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Abstract

The study aimed to unravel the interaction between ocean acidification and solar ultraviolet radiation (UVR) in Chaetoceros curvisetus. Chaetoceros curvisetus cells were acclimated to high CO2 (HC, 1000 ppmv) and low CO2 concentration (control, LC, 380 ppmv) for 14 days. Cell density, specific growth rate and chlorophyll were measured. The acclimated cells were then exposed to PAB (photosynthetically active radiation (PAR) + UV-A + UV-B), PA (PAR + UV-A) or P (PAR) for 60 min. Photochemical efficiency (ΦPSII), relative electron transport rate (rETR) and the recovery of ΦPSII were determined. HC induced higher cell density and specific growth rate compared with LC. However, no difference was found in chlorophyll between HC and LC. Moreover, ΦPSII and rETRs were higher under HC than LC in response to solar UVR. P exposure led to faster recovery of ΦPSII, both under HC and LC, than PA and PAB exposure. It appeared that harmful effects of UVR on C. curvisetus could be counteracted by ocean acidification simulated by high CO2 when the effect of climate change is not beyond the tolerance of cells.

Keywords

acidificationChaetoceros curvisetusCO2ocean acidificationphotochemical efficiencyUVR
Type
Research Article
Information
Journal of the Marine Biological Association of the United Kingdom , Volume 95 , Issue 4 , June 2015 , pp. 661 - 667
Copyright
Copyright © Marine Biological Association of the United Kingdom 2014 

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