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Proton concentration in the thylakoid membranes can regulate energy distribution between the two photosystems

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Photosynthetica

Abstract

The aim of our study was to investigate the role of protons in regulating energy distribution between the two photosystems in the thylakoid membranes. Low pH-induced changes were monitored in the presence of a proton blocker, N,N′-dicyclohexylcarbodiimide (DCCD). When thylakoid membranes were suspended in a low-pH reaction mixture and incubated with DCCD, then a decrease in the fluorescence intensity of photosystem II (PSII) was observed, while no change in the intensity of photosystem I (PSI) fluorescence occurred according to the measured fluorescence emission spectra at 77 K. Since low pH induced distribution of energy from PSII to PSI was inhibited in the presence of DCCD, we concluded that pH/proton concentration of the thylakoid membranes plays an important role in regulating the distribution of the absorbed excitation energy between both photosystems.

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Abbreviations

DCCD:

N,N′-dicyclohexylcarbodiimide

NPQ:

nonphotochemical quenching

qE :

energy-dependent quenching

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Correspondence to A. Jajoo.

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Acknowledgement: Supports from University Grant Commission, India (No. F.5-26/2007(BSR) to T. Tongra and from Department of Science and Technology, India (INT/RFBR/P-173) to A. Jajoo are thankfully acknowledged.

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Tongra, T., Bharti, S. & Jajoo, A. Proton concentration in the thylakoid membranes can regulate energy distribution between the two photosystems. Photosynthetica 52, 636–640 (2014). https://doi.org/10.1007/s11099-014-0066-1

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  • DOI: https://doi.org/10.1007/s11099-014-0066-1

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