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Photorespiration: metabolic pathways and their role in stress protection.

Wingler, Astrid and Lea, Peter John and Quick, W. Paul and Leegood, Richard C. (2000) Photorespiration: metabolic pathways and their role in stress protection. Philosophical Transactions of the Royal Society of London Series B - Biological Sciences, 355 (1402). pp. 1517-1529. ISSN 0962-8436

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Abstract

Photorespiration results from the oxygenase reaction catalysed by ribulose-1,5-bisphosphate carboxylase/oxygenase. In this reaction glycollate-2-phosphate is produced and subsequently metabolized in the photorespiratory pathway to form the Calvin cycle intermediate glycerate-3-phosphate. During this metabolic process, CO2 and NH3 are produced and ATP and reducing equivalents are consumed, thus making photorespiration a wasteful process. However, precisely because of this inefficiency, photorespiration could serve as an energy sink preventing the overreduction of the photosynthetic electron transport chain and photoinhibition, especially under stress conditions that lead to reduced rates of photosynthetic CO2 assimilation. Furthermore, photorespiration provides metabolites for other metabolic processes, e.g. glycine for the synthesis of glutathione, which is also involved in stress protection. In this review, we describe the use of photorespiratory mutants to study the control and regulation of photorespiratory pathways. In addition, we discuss the possible role of photorespiration under stress conditions, such as drought, high salt concentrations and high light intensities encountered by alpine plants.

Item Type: Article
Journal or Publication Title: Philosophical Transactions of the Royal Society of London Series B - Biological Sciences
Uncontrolled Keywords: Drought Stress Glutamate Synthase Glutamine Synthetase Glycine Decarboxylase Hydroxypyruvate Reductase Serine Glyoxylate Aminotransferase
Subjects: Q Science > QH Natural history > QH301 Biology
Departments: Faculty of Science and Technology > Lancaster Environment Centre
ID Code: 10894
Deposited By: Mr Richard Ingham
Deposited On: 25 Jul 2008 15:08
Refereed?: Yes
Published?: Published
Last Modified: 18 Sep 2013 16:00
Identification Number:
URI: http://eprints.lancs.ac.uk/id/eprint/10894

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