Plant Physiology Preview
Published on March 30, 2007; 10.1104/pp.107.097253
OPEN ACCESS ARTICLE
Received January 31, 2007
Accepted March 22, 2007
Impairment of the Photorespiratory Pathway Accelerates Photoinhibition of Photosystem II by Suppression of Repair but not Acceleration of Damage Processes in Arabidopsis
Shunichi Takahashi *, Hermann Bauwe , and Murray Badger
Molecular Plant Physiology Group and ARC Centre of Excellence in Plant Energy Biology, Research School of Biological Sciences, The Australian National University, Canberra, Australian Capital Territory, 2601 Australia; and University of Rostock, Bioscience Institute, Plant Physiology Department, D-18051 Rostock, Germany
* Corresponding author; email: shunichi.takahashi{at}anu.edu.au.
Oxygenation of ribulose-1,5-bisphosphate (RuBP) catalyzed by ribulose-1,5-bisphosphate carboxylase/oxygenase (rubisco) produces glycolate-2-phosphate. The photorespiratory pathway, which consists of photorespiratory carbon and nitrogen cycles, metabolizes glycolate-2-phosphate to the Calvin cycle intermediate glycerate-3-phosphate and is proposed to be important for avoiding photoinhibition of photosystem II (PSII), especially in C3 plants. We show here that mutants of Arabidopsis thaliana with impairment of ferredoxin-dependent glutamate synthase (Fd-GOGAT), serine hydroxymethyltransferase (SHMT), glutamate/malate transporter (DiT2) and glycerate kinase (GLYK) 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.
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