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Effects of solar UV radiation and temperature on morphology and photosynthetic performance of Chaetoceros curvisetus

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Photosynthetica

Abstract

This study investigated the effect of solar ultraviolet radiation (UVR) and temperature on a chain length and photosynthetic performance of diatom Chaetorceros curvisetus. The cells were cultured in large quartz tubes and exposed to PAR, PAR + UV-A (PA), or PAR + UV-A + UV-B (PAB) radiation at 20°C and 28°C for six days, respectively. After recovery for 1 h, the cells were exposed again to three different radiations for 1 h. Then, a change in the photochemical efficiency (FPSII) was examined and UVR-induced photoinhibition was calculated. The percentage of long chains (more than five single cells per chain) in C. curvisetus significantly increased from 8.2% (PAR) to 38.9% (PAB) at 20°C; while it was not notably affected at 28°C. Mycosporine-like amino acids (MAAs) concentration obviously increased by irradiance increment from PAR to PAB at 20°C. Chlorophyll (Chl) a concentration significantly declined with increasing irradiance at 20°C. Both MAAs and Chl a concentrations were not obviously changed by irradiance at 28°C. Before and after reexposure, FPSII was significantly reduced both at 20°C and 28°C. UVR-induced photoinhibition at 20°C (39%) was higher than that at 28°C (30.9%). Solar UV radiation, especially UV-B, could significantly influence the percentage of long chains of C. curvisetus, especially at low temperature. UVR-induced photoinhibition can be alleviated by higher temperatures.

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Abbreviations

Chl:

chlorophyll

MAAs:

mycosporine-like amino acids

PA:

photosynthetically active radiation plus UV-A radiation

PAB:

photosynthetically active radiation plus UV-A and UV-B radiation

PUFA:

polyunsaturated fatty acids

UVR:

ultraviolet radiation

FPSII :

photochemical efficiency of PSII

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Authors and Affiliations

  1. Department of Marine Biotechnology, School of Life Sciences, Wenzhou Medical Univerisity, Wenzhou, Zhejiang, 325035, China

    W. Guan

  2. Zhejiang Mariculture Research Institute, Wenzhou, 325005, China

    X. Peng

  3. Research Center for Harmful Algae and Aquatic Environment, Jinan University, Guangzhou, 510632, China

    S. Lu

Authors
  1. W. Guan
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  2. X. Peng
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  3. S. Lu
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Corresponding author

Correspondence to W. Guan.

Additional information

Acknowledgements: This study was funded by National Natural Science Foundation for Young Scholars of China (No. 41306106), National Basic Research Program of China (No. 2010CB428720), Science Technology Department of Zhejiang Province (No. 2014F10005 and 2012C13005), and Zhejiang Province Key Laboratory of Coastal Development and Conservation (No. J2013001).

The first two authors contributed equally to this work.

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Guan, W., Peng, X. & Lu, S. Effects of solar UV radiation and temperature on morphology and photosynthetic performance of Chaetoceros curvisetus . Photosynthetica 54, 219–225 (2016). https://doi.org/10.1007/s11099-015-0170-x

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  • DOI: https://doi.org/10.1007/s11099-015-0170-x

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