Abstract
A model based on our present knowledge of photosynthetic energy transduction is presented. Calculated electric potential profiles are compared with microelectrode recordings of the thylakoid electric potential during and after actinic illumination periods of intermediate duration. The information content of the measured electric response is disclosed by a comparison of experimental results with calculations. The proton flux through the ATP synthase complex is seen to markedly influence the electric response. Also the imbalance in maximum turnover rate between the two photosystems, common to obligate shade plants like Peperomia metallica used in the microelectrode experiments, is clearly reflected in the electric potential profile.
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Dedicated to Prof. L.N.M. Duysens on the occasion of his retirement.
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Van Kooten, O., Snel, J.F.H. & Vredenberg, W.J. Photosynthetic free energy transduction related to the electric potential changes across the thylakoid membrane. Photosynth Res 9, 211–227 (1986). https://doi.org/10.1007/BF00029745
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DOI: https://doi.org/10.1007/BF00029745
Key words
- ATPase flux
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- electron transport
- model simulation
- microelectrode measurements
- thylakoid membrane