AI Article Synopsis
- Photorespiration (PR) helps detoxify harmful products from the oxygenation action of the enzyme Rubisco, and its role in protecting plants under changing light conditions was studied.
- Contrary to expectations, plants with reduced PR activity grew better in fluctuating light compared to normal plants, suggesting that PR may not always be beneficial in dynamic environments.
- The study indicated that in fluctuating light, lower photosynthesis rates and altered metabolic processes helped plants manage PR issues, while problems arose only in steady light situations leading to potential damage.
Article 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 HO production. Our results reveal that dynamic light environments buffer plant growth and metabolism against photorespiratory perturbations.
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|---|---|
| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC10624928 | PMC |
| http://dx.doi.org/10.1038/s41467-023-42648-x | DOI Listing |
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