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Potassium (K plus ) gradients serve as a mobile energy source in plant vascular tissues

MPS-Authors
http://pubman.mpdl.mpg.de/cone/persons/resource/persons97159

Gajdanowicz,  P.
Transcription Factors and Gene Regulatory Networks, Cooperative Research Groups, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons97356

Rocha,  M.
Energy Metabolism, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons97110

Correa,  L. G. G.
Plant Signalling, Cooperative Research Groups, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons97347

Ramirez-Aguilar,  S. J.
Energy Metabolism, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons97172

Gomez-Porras,  J. L.
Transcription Factors and Gene Regulatory Networks, Cooperative Research Groups, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons97457

van Dongen,  J. T.
Energy Metabolism, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

http://pubman.mpdl.mpg.de/cone/persons/resource/persons97127

Dreyer,  I.
Plant Signalling, Cooperative Research Groups, Max Planck Institute of Molecular Plant Physiology, Max Planck Society;

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Citation

Gajdanowicz, P., Michard, E., Sandmann, M., Rocha, M., Correa, L. G. G., Ramirez-Aguilar, S. J., et al. (2011). Potassium (K plus ) gradients serve as a mobile energy source in plant vascular tissues. Proceedings of the National Academy of Sciences of the United States of America, 108(2), 864-869. doi:10.1073/pnas.1009777108.


Cite as: http://hdl.handle.net/11858/00-001M-0000-0014-21F4-1
Abstract
The essential mineral nutrient potassium (K+) is the most important inorganic cation for plants and is recognized as a limiting factor for crop yield and quality. Nonetheless, it is only partially understood how K+ contributes to plant productivity. K+ is used as a major active solute to maintain turgor and to drive irreversible and reversible changes in cell volume. K+ also plays an important role in numerous metabolic processes, for example, by serving as an essential cofactor of enzymes. Here, we provide evidence for an additional, previously unrecognized role of K+ in plant growth. By combining diverse experimental approaches with computational cell simulation, we show that K+ circulating in the phloem serves as a decentralized energy storage that can be used to overcome local energy limitations. Posttranslational modification of the phloem-expressed Arabidopsis K+ channel AKT2 taps this "potassium battery," which then efficiently assists the plasma membrane H+-ATPase in energizing the transmembrane phloem (re) loading processes.