[No authors listed]
In chloroplasts, regulated formation of the proton gradient across the thylakoid membrane (ÎpH) is important for controlling non-photochemical quenching (NPQ), which is crucial for plants to perform photosynthesis under fluctuating light conditions. The ÎpH is generated by two electron flows: the linear electron flow (LEF) and the cyclic electron flow (CEF). The Arabidopsis CEF mutant, pgr5, showed significantly lower NPQ values than those observed in WT, indicating that ÎpH, generated by the PGR5-dependent CEF, has a crucial role in controlling NPQ. However, the respective significance of LEF and CEF for ÎpH formation is largely unknown. Here we applied computer simulation to reproduce NPQ induction kinetics and estimate the respective contribution of LEF and PGR5-dependent CEF to the dynamics of ÎpH formation. The results indicate that the contribution of CEF to total ÎpH formation for induction of NPQ varies from 60-80%. The simulation also suggested a role of the PGR5-dependent CEF in accelerating electron transfer in the cytochrome b6f complex.
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