Ion antiport accelerates photosynthetic acclimation in fluctuating light environments.

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.

journal_name

Nat Commun

journal_title

Nature communications

authors

Armbruster U,Carrillo LR,Venema K,Pavlovic L,Schmidtmann E,Kornfeld A,Jahns P,Berry JA,Kramer DM,Jonikas MC

doi

10.1038/ncomms6439

subject

Has Abstract

pub_date

2014-11-13 00:00:00

pages

5439

issn

2041-1723

pii

ncomms6439

journal_volume

5

pub_type

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