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Tu Bo, Yuan Wu-Biao, Xu Xing-Lian, Mei Hong, Wu Hong-Yan. Effect of solar UV radiation on photosystem Ⅱ function in Thalassiosira pseudonana under different mixing rates[J]. Plant Science Journal, 2018, 36(2): 300-308. DOI: 10.11913/PSJ.2095-0837.2018.20300
Citation: Tu Bo, Yuan Wu-Biao, Xu Xing-Lian, Mei Hong, Wu Hong-Yan. Effect of solar UV radiation on photosystem Ⅱ function in Thalassiosira pseudonana under different mixing rates[J]. Plant Science Journal, 2018, 36(2): 300-308. DOI: 10.11913/PSJ.2095-0837.2018.20300

Effect of solar UV radiation on photosystem Ⅱ function in Thalassiosira pseudonana under different mixing rates

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This work was supported by grants from the National Natural Science Foundation of China (31270452), Research Project of Chinese Ministry of Education (213026A), Open Project Foundation of State Key Laboratory of Freshwater Ecology and Biotechnology (2014FB04) and Project of Key Laboratory of Ecological Remediation for Lakes and Rivers and Algal Utilization of Hubei Province (HHKF201508).

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  • Received Date: October 22, 2017
  • Available Online: October 31, 2022
  • Published Date: April 27, 2018
  • The marine diatom Thalassiosira pseudonana was selected as experimental material to investigate the impact of photosynthetically active radiation (PAR) and PAR plus ultraviolet radiation (UVR) on the function of photosystem Ⅱ(PSⅡ) with increasing irradiance levels at two different mixing rates. Results showed that, at slow mixing speed, the maximum quantum yield of PSⅡ(Fv/Fm), photosynthetic efficiency parameter (α), and maximum relative electron transport rate (rETRmax) were progressively inhibited with increasing irradiance levels in both PAR and PAR + UVR treatments. The decreased PSⅡ D1 protein content, which indicates less active PSⅡ reaction centers, led to the increase in energy fluxes for absorption (ABS/RC) and dissipation (DI0/RC) per reaction center. In contrast, at fast mixing speed, Fv/Fm increased under PAR compared with that at slow mixing and D1 protein content was also enhanced. However, similar changes were shown in various photosynthetic parameters under UVR. These results indicate that fast mixing could alleviate the photoinhibition caused by high PAR but could not modify the effects of UVR.
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