Pawel Gajdanowicz, Erwan Michard, Michael Sandmann, Marcio Rocha, Luiz Gustavo Guedes Correa, Santiago J. Ramirez-Aguilar, Judith L. Gomez-Porras, Wendy Gonzalez, Jean-Baptiste Thibaud, Joost T. van Dongen, Ingo Dreyer
- 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)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.…
MetadatenAuthor details: | Pawel Gajdanowicz, Erwan Michard, Michael Sandmann, Marcio Rocha, Luiz Gustavo Guedes Correa, Santiago J. Ramirez-Aguilar, Judith L. Gomez-Porras, Wendy GonzalezORCiD, Jean-Baptiste Thibaud, Joost T. van Dongen, Ingo DreyerORCiDGND |
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DOI: | https://doi.org/10.1073/pnas.1009777108 |
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ISSN: | 0027-8424 |
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Title of parent work (English): | Proceedings of the National Academy of Sciences of the United States of America |
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Publisher: | National Acad. of Sciences |
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Place of publishing: | Washington |
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Publication type: | Article |
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Language: | English |
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Year of first publication: | 2011 |
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Publication year: | 2011 |
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Release date: | 2017/03/26 |
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Tag: | channel gating; energy limiting condition; phloem reloading; posttranslational regulation; potassium channel |
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Volume: | 108 |
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Issue: | 2 |
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Number of pages: | 6 |
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First page: | 864 |
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Last Page: | 869 |
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Funding institution: | German Science Foundation (Deutsche Forschungsgemeinschaft) [DR 430/5-1,
/5-2]; German Academic Exchange Service (DAAD); Comision Nacional de
Investigacion Cientifica y Tecnologica de Chile (CONICYT); Agropolis
Fondation (Reseau Thematique de Recherche Avancee Montpellier)
[0803-022] |
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Organizational units: | Mathematisch-Naturwissenschaftliche Fakultät / Institut für Biochemie und Biologie |
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Peer review: | Referiert |
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