Energy dissipation pathways in Photosystem 2 of the diatom, Phaeodactylum tricornutum, under high-light conditions

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• 作者：Fedor I. Kuzminov ; Maxim Y. Gorbunov
• 关键词：Non ; photochemical quenching ; Diatoms ; Photosystem 2 ; Reaction center ; Light ; harvesting complex ; Photosynthetic energy transfer
• 刊名：Photosynthesis Research
• 出版年：2016
• 出版时间：February 2016
• 年：2016
• 卷：127
• 期：2
• 页码：219-235
• 全文大小：1,082 KB
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• 作者单位：Fedor I. Kuzminov (1) (2)
  Maxim Y. Gorbunov (1)
  
  1. Environmental Biophysics and Molecular Biology Program, Department of Marine and Coastal Sciences, Rutgers University, New Brunswick, NJ, 08901, USA
  2. International Laser Center, M.V. Lomonosov Moscow State University, 119991, Moscow, Russia
  
• 刊物类别：Biomedical and Life Sciences
• 刊物主题：Life Sciences
  Plant Physiology
  
• 出版者：Springer Netherlands
• ISSN：1573-5079

文摘

To prevent photooxidative damage under supraoptimal light, photosynthetic organisms evolved mechanisms to thermally dissipate excess absorbed energy, known as non-photochemical quenching (NPQ). Here we quantify NPQ-induced alterations in light-harvesting processes and photochemical reactions in Photosystem 2 (PS2) in the pennate diatom Phaeodactylum tricornutum. Using a combination of picosecond lifetime analysis and variable fluorescence technique, we examined the dynamics of NPQ activation upon transition from dark to high light. Our analysis revealed that NPQ activation starts with a 2–3-fold increase in the rate constant of non-radiative charge recombination in the reaction center (RC); however, this increase is compensated with a proportional increase in the rate constant of back reactions. The resulting alterations in photochemical processes in PS2 RC do not contribute directly to quenching of antenna excitons by the RC, but favor non-radiative dissipation pathways within the RC, reducing the yields of spin conversion of the RC chlorophyll to the triplet state. The NPQ-induced changes in the RC are followed by a gradual ~ 2.5-fold increase in the yields of thermal dissipation in light-harvesting complexes. Our data suggest that thermal dissipation in light-harvesting complexes is the major sink for NPQ; RCs are not directly involved in the NPQ process, but could contribute to photoprotection via reduction in the probability of 3Chl formation. Keywords Non-photochemical quenching Diatoms Photosystem 2 Reaction center Light-harvesting complex Photosynthetic energy transfer