Reaction centre quenching of excess light energy and photoprotection of photosystem II |
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Authors: | Alexander G Ivanov Vaughan Hurry Prafullachandra V Sane Gunnar Öquist Norman P A Huner |
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Institution: | 1. Department of Biology and the Biotron, University of Western Ontario, 1151 Richmond Street N, N6A 5B7, London, Ontario, Canada 2. Ume? Plant Science Centre, Department of Plant Physiology, Urnea University, Ume? S-901 87, Sweden
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Abstract: | In addition to the energy dissipation of excess light occurring in PSII antenna via the xanthophyll cycle, there is mounting
evidence of a zeaxanthin-independent pathway for non-photochemical quenching based within the PSII reaction centre (reaction
centre quenching) that may also play a significant role in photoprotection. It has been demonstrated that acclimation of higher
plants, green algae and cyanobacteria to low temperature or high light conditions which potentially induce an imbalance between
energy supply and energy utilization is accompanied by the development of higher reduction state of QA and higher resistance to photoinhibition (Huner et al., 1998). Although this is a fundamental feature of all photoautotrophs,
and the acquisition of increased tolerance to photoinhibition has been ascribed to growth and development under high PSII
excitation pressure, the precise mechanism controlling the redox state of QA and its physiological significance in developing higher resistance to photoinhibition has not been fully elucidated. In this
review we summarize recent data indicating that the increased resistance to high light in a broad spectrum of photosynthetic
organisms acclimated to high excitation pressure conditions is associated with an increase probability for alternative non-radiative
P680+QA
- radical pair recombination pathway for energy dissipation within the reaction centre of PSII. The various molecular mechanisms
that could account for non-photochemical quenching through PSII reaction centre are also discussed. |
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Keywords: | electron transport energy dissipation non-photochemical quenching photoprotection photosystem II reaction centre quenching |
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