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, Martin C. Jonikas

Research output: Contribution to journalArticlepeer-review

187 Scopus citations


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.

Original languageEnglish (US)
Article number5439
JournalNature communications
StatePublished - Nov 13 2014
Externally publishedYes

All Science Journal Classification (ASJC) codes

  • General Chemistry
  • General Biochemistry, Genetics and Molecular Biology
  • General Physics and Astronomy


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