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First published online March 30, 2007; 10.1104/pp.107.097253 Plant Physiology 144:487-494 (2007) © 2007 American Society of Plant Biologists OPEN ACCESS ARTICLE
Impairment of the Photorespiratory Pathway Accelerates Photoinhibition of Photosystem II by Suppression of Repair But Not Acceleration of Damage Processes in Arabidopsis1,[W],[OA]Molecular Plant Physiology Group and Australian Research Council Centre of Excellence in Plant Energy Biology, Research School of Biological Sciences, Australian National University, Canberra, Australian Capital Territory 2601, Australia (S.T., M.B.); and Plant Physiology Department, Bioscience Institute, University of Rostock, D–18051 Rostock, Germany (H.B.)
Oxygenation of ribulose-1,5-bisphosphate catalyzed by Rubisco produces glycolate-2-P. The photorespiratory pathway, which consists of photorespiratory carbon and nitrogen cycles, metabolizes glycolate-2-P to the Calvin cycle intermediate glycerate-3-P and is proposed to be important for avoiding photoinhibition of photosystem II (PSII), especially in C3 plants. We show here that mutants of Arabidopsis (Arabidopsis thaliana) with impairment of ferredoxin-dependent glutamate synthase, serine hydroxymethyltransferase, glutamate/malate transporter, and glycerate kinase had accelerated photoinhibition of PSII by suppression of the repair of photodamaged PSII and not acceleration of the photodamage to PSII. We found that suppression of the repair process was attributable to inhibition of the synthesis of the D1 protein at the level of translation. Our results suggest that the photorespiratory pathway helps avoid inhibition of the synthesis of the D1 protein, which is important for the repair of photodamaged PSII upon interruption of the Calvin cycle.
1 This work was supported by a research fellowship from the Japan Society for the Promotion of Science for Young Scientists and by a Grant-in-Aid for fellows of the Japan Society for the Promotion of Science (both to S.T.). The research was also supported by grants from the Australian Research Council to the Centre of Excellence in Plant Energy Biology (to M.B.) and from the Deutsche Forschungsgemeinschaft (to H.B.). The author responsible for distribution of materials integral to the findings presented in this article in accordance with the policy described in the Instructions for Authors (www.plantphysiol.org) is: Shunichi Takahashi (shunichi.takahashi{at}anu.edu.au). [W] The online version of this article contains Web-only data. [OA] Open Access articles can be viewed online without a subscription. www.plantphysiol.org/cgi/doi/10.1104/pp.107.097253 * Corresponding author; e-mail shunichi.takahashi{at}anu.edu.au; fax 61–2–6125–5075. Received January 31, 2007; accepted March 22, 2007; published March 30, 2007. Related articles in Plant Physiol.:
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