A voltage-dependent chloride channel fine-tunes photosynthesis in plants

Andrei Herdean, Enrico Teardo, Anders K. Nilsson, Bernard E. Pfeil, Oskar N. Johansson, Renáta Ünnep, Gergely Nagy, Ottó Zsiros, Somnath Dana, Katalin Solymosi, Győző Garab, Ildikó Szabó, Cornelia Spetea () and Björn Lundin ()
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Andrei Herdean: University of Gothenburg
Enrico Teardo: University of Padova
Anders K. Nilsson: University of Gothenburg
Bernard E. Pfeil: University of Gothenburg
Oskar N. Johansson: University of Gothenburg
Renáta Ünnep: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute
Gergely Nagy: Laboratory for Neutron Scattering and Imaging, Paul Scherrer Institute
Ottó Zsiros: Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences
Somnath Dana: University of Gothenburg
Katalin Solymosi: Eötvös Loránd University
Győző Garab: Institute of Plant Biology, Biological Research Center, Hungarian Academy of Sciences
Ildikó Szabó: University of Padova
Cornelia Spetea: University of Gothenburg
Björn Lundin: University of Gothenburg

Nature Communications, 2016, vol. 7, issue 1, 1-11

Abstract: Abstract In natural habitats, plants frequently experience rapid changes in the intensity of sunlight. To cope with these changes and maximize growth, plants adjust photosynthetic light utilization in electron transport and photoprotective mechanisms. This involves a proton motive force (PMF) across the thylakoid membrane, postulated to be affected by unknown anion (Cl−) channels. Here we report that a bestrophin-like protein from Arabidopsis thaliana functions as a voltage-dependent Cl− channel in electrophysiological experiments. AtVCCN1 localizes to the thylakoid membrane, and fine-tunes PMF by anion influx into the lumen during illumination, adjusting electron transport and the photoprotective mechanisms. The activity of AtVCCN1 accelerates the activation of photoprotective mechanisms on sudden shifts to high light. Our results reveal that AtVCCN1, a member of a conserved anion channel family, acts as an early component in the rapid adjustment of photosynthesis in variable light environments.

Date: 2016
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DOI: 10.1038/ncomms11654

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