, Volume 54, Issue 2, pp 219–225 | Cite as

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

  • W. Guan
  • X. Peng
  • S. Lu
Original papers


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.

Additional key words

photochemical efficiency phytoplankton solar ultraviolet radiation 





mycosporine-like amino acids


photosynthetically active radiation plus UV-A radiation


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


polyunsaturated fatty acids


ultraviolet radiation


photochemical efficiency of PSII


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Copyright information

© The Institute of Experimental Botany 2016

Authors and Affiliations

  1. 1.Department of Marine Biotechnology, School of Life SciencesWenzhou Medical UniverisityWenzhou, ZhejiangChina
  2. 2.Zhejiang Mariculture Research InstituteWenzhouChina
  3. 3.Research Center for Harmful Algae and Aquatic EnvironmentJinan UniversityGuangzhouChina

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