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A Dual Strategy to Cope with High Light in Chlamydomonas reinhardtii
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- Allorent, Guillaume (författare)
- Centre National Recherche Scientifique, Unité Mixte Recherche 5168, Laboratoire Physiologie Cellulaire et Végétale, F-38054 Grenoble, France;Commissariat à l'Energie Atomique et Energies Alternatives, l'Institut de Recherches en Technologies et Sciences pour le Vivant, F-38054 Grenoble, France;Université Grenoble 1, F-38041 Grenoble, France;Institut National Recherche Agronomique, Unité Mixte de Recherche 1200, F-38054 Grenoble, France
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- Tokutsu, Ryutaro (författare)
- Division of Environmental Photobiology, National Institute for Basic Biology, 444-8585 Okazaki, Japan
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- Roach, Thomas (författare)
- Commissariat à l'Energie Atomique et Energies Alternatives Saclay, Institute of Biology and Technology-Saclay, Centre National de la Recherche Scientifique, Unité Mixte de Recherche 8221, Service de Bioénergétique, Biologie Structurale et Mécanisme, 91191 Gif-sur-Yvette cedex, France
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- 2013-02-19
- 2013
- Engelska.
- Ingår i: The Plant Cell. - : Oxford University Press. - 1040-4651 .- 1532-298X. ; 25:2, s. 545-557
- Tidskriftsartikel (refereegranskat)
Abstract
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- Absorption of light in excess of the capacity for photosynthetic electron transport is damaging to photosynthetic organisms. Several mechanisms exist to avoid photodamage, which are collectively referred to as nonphotochemical quenching. This term comprises at least two major processes. State transitions (qT) represent changes in the relative antenna sizes of photosystems II and I. High energy quenching (qE) is the increased thermal dissipation of light energy triggered by lumen acidification. To investigate the respective roles of qE and qT in photoprotection, a mutant (npq4 stt7-9) was generated in Chlamydomonas reinhardtii by crossing the state transition-deficient mutant (stt7-9) with a strain having a largely reduced qE capacity (npq4). The comparative phenotypic analysis of the wild type, single mutants, and double mutants reveals that both state transitions and qE are induced by high light. Moreover, the double mutant exhibits an increased photosensitivity with respect to the single mutants and the wild type. Therefore, we suggest that besides qE, state transitions also play a photoprotective role during high light acclimation of the cells, most likely by decreasing hydrogen peroxide production. These results are discussed in terms of the relative photoprotective benefit related to thermal dissipation of excess light and/or to the physical displacement of antennas from photosystem II.
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- NATURVETENSKAP -- Biologi (hsv//swe)
- NATURAL SCIENCES -- Biological Sciences (hsv//eng)
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