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Guard cell photorespiration controls stomata behavior and development
Hu Sun1, Inken Thiemann1, Nils Schmidt1
1Plant Physiology Department, University of Rostock, Albert-Einstein-Straße 3, Rostock, D-18059, Germany.
The New Phytologist
|March 27, 2026
Summary
Photorespiration is essential for guard cell function and stomatal regulation. Manipulating the photorespiratory enzyme PGLP1 in guard cells impacts plant growth, photosynthesis, and stomatal behavior.
Area of Science:
- Plant Physiology
- Biochemistry
- Molecular Biology
Background:
- Photorespiration is crucial for protecting the Calvin-Benson-Bassham cycle from Rubisco's oxidative misfire.
- Its direct role in regulating guard cell function and stomatal behavior is debated.
Purpose of the Study:
- To investigate the direct link between photorespiratory metabolism and guard cell function in Arabidopsis thaliana.
- To determine the impact of manipulating 2-phosphoglycolate phosphatase 1 (PGLP1) in guard cells on plant physiology and stomatal traits.
Main Methods:
- Genetic manipulation of PGLP1 specifically in Arabidopsis guard cells.
- Assessment of plant growth, photosynthesis, carbohydrate allocation, and H2O2 accumulation.
- Analysis of stomatal traits and response to exogenous 2-phosphoglycolate (2-PG) application.
Main Results:
- Altered guard cell PGLP1 expression affected plant growth, photosynthesis, and stomatal movement.
- PGLP1 perturbation led to guard cell-specific accumulation of starch and H2O2, impacting stomatal behavior.
- Changes in stomatal size were observed, mimicking effects of external 2-PG application.
Conclusions:
- Efficient photorespiratory metabolism is vital for guard cell function and acclimation to varying CO2:O2 ratios.
- This study reveals a direct metabolic link between photorespiration and stomatal behavior.
- Photorespiration plays an unexpected role in controlling plant gas exchange, photosynthesis, and resilience.
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