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

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.

SUBMITTER: Gajdanowicz P

PROVIDER: S-EPMC3021027 | biostudies-literature | 2011 Jan

REPOSITORIES: biostudies-literature

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

Gajdanowicz Pawel P Michard Erwan E Sandmann Michael M Rocha Marcio M Corrêa Luiz Gustavo Guedes LG Ramírez-Aguilar Santiago J SJ Gomez-Porras Judith L JL González Wendy W Thibaud Jean-Baptiste JB van Dongen Joost T JT Dreyer Ingo I

Proceedings of the National Academy of Sciences of the United States of America 20101227 2

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 enzym ...[more]

PMID: 21187374

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Dataset Information

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

Publications

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

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