Ion antiport accelerates photosynthetic acclimation in fluctuating light environments

Ute Armbruster (), L. Ruby Carrillo, Kees Venema, Lazar Pavlovic, Elisabeth Schmidtmann, Ari Kornfeld, Peter Jahns, Joseph A. Berry, David M. Kramer and Martin C. Jonikas ()
Additional contact information
Ute Armbruster: Carnegie Institution for Science
L. Ruby Carrillo: Plant Research Laboratory, Michigan State University, R106 Plant Biology Building
Kees Venema: Dpto de Bioquímica, Biología Celular y Molecular de Plantas, Estación Experimental del Zaidín, Consejo Superior de Investigaciones Científicas
Lazar Pavlovic: Biochemie der Pflanzen, Heinrich-Heine-Universität Düsseldorf
Elisabeth Schmidtmann: Carnegie Institution for Science
Ari Kornfeld: Carnegie Institution for Science
Peter Jahns: Biochemie der Pflanzen, Heinrich-Heine-Universität Düsseldorf
Joseph A. Berry: Carnegie Institution for Science
David M. Kramer: Plant Research Laboratory, Michigan State University, R106 Plant Biology Building
Martin C. Jonikas: Carnegie Institution for Science

Nature Communications, 2014, vol. 5, issue 1, 1-8

Abstract: Abstract Many photosynthetic organisms globally, including crops, forests and algae, must grow in environments where the availability of light energy fluctuates dramatically. How photosynthesis maintains high efficiency despite such fluctuations in its energy source remains poorly understood. Here we show that Arabidopsis thaliana K+ efflux antiporter (KEA3) is critical for high photosynthetic efficiency under fluctuating light. On a shift from dark to low light, or high to low light, kea3 mutants show prolonged dissipation of absorbed light energy as heat. KEA3 localizes to the thylakoid membrane, and allows proton efflux from the thylakoid lumen by proton/potassium antiport. KEA3’s activity accelerates the downregulation of pH-dependent energy dissipation after transitions to low light, leading to faster recovery of high photosystem II quantum efficiency and increased CO2 assimilation. Our results reveal a mechanism that increases the efficiency of photosynthesis under fluctuating light.

Date: 2014
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DOI: 10.1038/ncomms6439

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