Growth in fluctuating light buffers plants against photorespiratory perturbations

Thekla von Bismarck (), Philipp Wendering, Leonardo Perez de Souza, Jeremy Ruß, Linnéa Strandberg, Elmien Heyneke, Berkley J. Walker, Mark A. Schöttler, Alisdair R. Fernie, Zoran Nikoloski and Ute Armbruster ()
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Thekla von Bismarck: Molecular Photosynthesis, Heinrich-Heine-University Düsseldorf
Philipp Wendering: Max Planck Institute of Molecular Plant Physiology
Leonardo Perez de Souza: Max Planck Institute of Molecular Plant Physiology
Jeremy Ruß: Max Planck Institute of Molecular Plant Physiology
Linnéa Strandberg: Max Planck Institute of Molecular Plant Physiology
Elmien Heyneke: Max Planck Institute of Molecular Plant Physiology
Berkley J. Walker: Michigan State University
Mark A. Schöttler: Max Planck Institute of Molecular Plant Physiology
Alisdair R. Fernie: Max Planck Institute of Molecular Plant Physiology
Zoran Nikoloski: Max Planck Institute of Molecular Plant Physiology
Ute Armbruster: Molecular Photosynthesis, Heinrich-Heine-University Düsseldorf

Nature Communications, 2023, vol. 14, issue 1, 1-16

Abstract: Abstract Photorespiration (PR) is the pathway that detoxifies the product of the oxygenation reaction of Rubisco. It has been hypothesized that in dynamic light environments, PR provides a photoprotective function. To test this hypothesis, we characterized plants with varying PR enzyme activities under fluctuating and non-fluctuating light conditions. Contrasting our expectations, growth of mutants with decreased PR enzyme levels was least affected in fluctuating light compared with wild type. Results for growth, photosynthesis and metabolites combined with thermodynamics-based flux analysis revealed two main causal factors for this unanticipated finding: reduced rates of photosynthesis in fluctuating light and complex re-routing of metabolic fluxes. Only in non-fluctuating light, mutants lacking the glutamate:glyoxylate aminotransferase 1 re-routed glycolate processing to the chloroplast, resulting in photooxidative damage through H2O2 production. Our results reveal that dynamic light environments buffer plant growth and metabolism against photorespiratory perturbations.

Date: 2023
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DOI: 10.1038/s41467-023-42648-x

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