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 H 2 O 2 production. Our results reveal that dynamic light environments buffer plant growth and metabolism against photorespiratory perturbations.
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Claims 5
Claim · model-written summary
Growth of mutants with decreased PR enzyme levels was least affected in fluctuating light compared with wild type.
Verbatim
t0“Growth in fluctuating light buffers plants against photorespiratory perturbations”
e1“growth of mutants with decreased PR enzyme levels was least affected in fluctuating light compared with wild type”
Claim · model-written summary
Reduced photosynthesis rates in fluctuating light are a causal factor of the growth result.
- Taxon
- plantsViridiplantaet0
- Outcome
- growthe1
- Qualifier
- reduced rates of photosynthesis in fluctuating lighte2
Verbatim
t0“Growth in fluctuating light buffers plants against photorespiratory perturbations”
e1“growth of mutants with decreased PR enzyme levels was least affected in fluctuating light compared with wild type”
e2“reduced rates of photosynthesis in fluctuating light and complex re-routing of metabolic fluxes”
Claim · model-written summary
Complex re-routing of metabolic fluxes is a causal factor of the growth result.
- Taxon
- plantsViridiplantaet0
- Outcome
- growthe1
- Qualifier
- complex re-routing of metabolic fluxese2
Verbatim
t0“Growth in fluctuating light buffers plants against photorespiratory perturbations”
e1“growth of mutants with decreased PR enzyme levels was least affected in fluctuating light compared with wild type”
e2“reduced rates of photosynthesis in fluctuating light and complex re-routing of metabolic fluxes”
Claim · model-written summary
Glutamate:glyoxylate aminotransferase 1 mutants in non-fluctuating light re-routed glycolate processing, causing photooxidative damage through H2O2.
Verbatim
t0“Growth in fluctuating light buffers plants against photorespiratory perturbations”
e3“Only in non-fluctuating light, mutants lacking the glutamate:glyoxylate aminotransferase 1 re-routed glycolate processing to the chloroplast, resulting in photooxidative damage through H 2 O 2 production”
Claim · model-written summary
Dynamic light environments buffer plant growth and metabolism against photorespiratory perturbations.
- Taxon
- plantsViridiplantaet0
- Treatment
- dynamic light environmentse4
- Outcome
- plant growth and metabolisme4
- Direction
- buffere4
Not reportedComparator
Verbatim
t0“Growth in fluctuating light buffers plants against photorespiratory perturbations”
e4“Our results reveal that dynamic light environments buffer plant growth and metabolism against photorespiratory perturbations”
The same questions in other papers
light · growth · Viridiplantae (plants)Positive and negative results
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- no effect
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