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 0962-8436Full text not available from this repository.
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.
|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|
|Deposited By:||Mr Richard Ingham|
|Deposited On:||25 Jul 2008 15:08|
|Last Modified:||26 Jul 2012 14:54|
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