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  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., 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.

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Item Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-21F4-1 Version Permalink: http://hdl.handle.net/11858/00-001M-0000-0014-21F5-0
Genre: Journal Article

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 Creators:
Gajdanowicz, P.1, Author              
Michard, E.2, Author
Sandmann, M.2, Author
Rocha, M.3, Author              
Correa, L. G. G.4, Author              
Ramirez-Aguilar, S. J.3, Author              
Gomez-Porras, J. L.1, Author              
Gonzalez, W.2, Author
Thibaud, J. B.2, Author
van Dongen, J. T.3, Author              
Dreyer, I.4, Author              
Affiliations:
1Transcription Factors and Gene Regulatory Networks, Cooperative Research Groups, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753316              
2External Organizations, ou_persistent22              
3Energy Metabolism, Department Bock, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753325              
4Plant Signalling, Cooperative Research Groups, Max Planck Institute of Molecular Plant Physiology, Max Planck Society, ou_1753311              

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Free keywords: channel gating energy limiting condition phloem reloading posttranslational regulation potassium channel arabidopsis-thaliana channel phloem akt1 expression growth rectification akt2/3 domain roots
 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.

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Language(s): eng - English
 Dates: 2010-12-272011
 Publication Status: Published in print
 Pages: -
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 Rev. Type: -
 Identifiers: ISI: ISI:000286097700079
DOI: 10.1073/pnas.1009777108
ISSN: 0027-8424
URI: ://000286097700079 http://www.pnas.org/content/108/2/864.full.pdf
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Title: Proceedings of the National Academy of Sciences of the United States of America
Source Genre: Journal
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Pages: - Volume / Issue: 108 (2) Sequence Number: - Start / End Page: 864 - 869 Identifier: -