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

Gajdanowicz, P.; Michard, E.; Sandmann, M.; Rocha, M.; Correa, L. G. G.; Ramirez-Aguilar, S. J.; Gomez-Porras, J. L.; Gonzalez, W.; Thibaud, J. B.; van Dongen, J. T.; Dreyer, I.

doi:10.1073/pnas.1009777108

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

MPG-Autoren

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

/persons/resource/persons97356

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

/persons/resource/persons97110

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

/persons/resource/persons97347

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

/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;

/persons/resource/persons97457

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

/persons/resource/persons97127

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

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Zitation

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.

Zitierlink: https://hdl.handle.net/11858/00-001M-0000-0014-21F4-1

Zusammenfassung

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.