Journal
NEW PHYTOLOGIST
Volume 223, Issue 4, Pages 1762-1769Publisher
WILEY
DOI: 10.1111/nph.15872
Keywords
C-1 metabolism; CO2 assimilation; crop yield; metabolic interdependency; oxygenation; photosynthetic efficiency; RubisCO; synthetic bypass
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Funding
- the Deutsche Forschungsgemeinschaft (DFG, German Research Foundation) under Germanys Excellence Strategy [EXC-2048/1, 390686111]
- the Federal Ministry of Education and Research, project FormatPlant [FKZ: 031B0194]
- the EU H2020 project CropBooster-P [817690]
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Photorespiration is frequently considered a wasteful and inefficient process. However, mutant analysis demonstrated that photorespiration is essential for recycling of 2-phosphoglycolate in C-3 and C-4 land plants, in algae, and even in cyanobacteria operating carboxysome-based carbon (C) concentrating mechanisms. Photorespiration links photosynthetic C assimilation with other metabolic processes, such as nitrogen and sulfur assimilation, as well as C-1 metabolism, and it may contribute to balancing the redox poise between chloroplasts, peroxisomes, mitochondria and cytoplasm. The high degree of metabolic interdependencies and the pleiotropic phenotypes of photorespiratory mutants impedes the distinction between core and accessory functions. Newly developed synthetic bypasses of photorespiration, beyond holding potential for significant yield increases in C-3 crops, will enable us to differentiate between essential and accessory functions of photorespiration.
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