Abstract
Oxygen-evolving photosynthetic organisms possess nonphotochemical quenching (NPQ) pathways that protect against photo-induced damage. The majority of NPQ in plants is regulated on a rapid timescale by changes in the pH of the thylakoid lumen. In order to quantify the rapidly reversible component of NPQ, called qE, we developed a mathematical model of pH-dependent quenching of chlorophyll excitations in Photosystem II. Our expression for qE depends on the protonation of PsbS and the deepoxidation of violaxanthin by violaxanthin deepoxidase. The model is able to simulate the kinetics of qE at low and high light intensities. The simulations suggest that the pH of the lumen, which activates qE, is not itself affected by qE. Our model provides a framework for testing hypothesized qE mechanisms and for assessing the role of qE in improving plant fitness in variable light intensity.
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Claims 2
Claim · model-written summary
The model simulated qE kinetics at low and high light intensities.
- Taxon
- plantsViridiplantaee1
- Outcome
- kinetics of qEe0
- Comparator
- low and high light intensitiese0
Verbatim
e0“The model is able to simulate the kinetics of qE at low and high light intensities.”
e1“The majority of NPQ in plants”
Claim · model-written summary
Simulations suggested qE does not itself affect the lumen pH that activates qE.
- Taxon
- plantsViridiplantaee1
- Outcome
- pH of the lumene0
- Qualifier
- not itself affected by qEe0
Verbatim
e0“The simulations suggest that the pH of the lumen, which activates qE, is not itself affected by qE.”
e1“The majority of NPQ in plants”