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The Complex Fine-Tuning of K+ Fluxes in Plants in Relation to Osmotic and Ionic Abiotic Stresses

BPMP, Univ Montpellier, CNRS, INRA, SupAgro, Montpellier, France
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Int. J. Mol. Sci. 2019, 20(3), 715; https://doi.org/10.3390/ijms20030715
Received: 29 November 2018 / Revised: 17 January 2019 / Accepted: 29 January 2019 / Published: 7 February 2019
As the main cation in plant cells, potassium plays an essential role in adaptive responses, especially through its involvement in osmotic pressure and membrane potential adjustments. K+ homeostasis must, therefore, be finely controlled. As a result of different abiotic stresses, especially those resulting from global warming, K+ fluxes and plant distribution of this ion are disturbed. The hormone abscisic acid (ABA) is a key player in responses to these climate stresses. It triggers signaling cascades that ultimately lead to modulation of the activities of K+ channels and transporters. After a brief overview of transcriptional changes induced by abiotic stresses, this review deals with the post-translational molecular mechanisms in different plant organs, in Arabidopsis and species of agronomical interest, triggering changes in K+ uptake from the soil, K+ transport and accumulation throughout the plant, and stomatal regulation. These modifications involve phosphorylation/dephosphorylation mechanisms, modifications of targeting, and interactions with regulatory partner proteins. Interestingly, many signaling pathways are common to K+ and Cl/NO3 counter-ion transport systems. These cross-talks are also addressed. View Full-Text
Keywords: plants; abiotic stress; abscisic acid; potassium transport regulation plants; abiotic stress; abscisic acid; potassium transport regulation
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Chérel, I.; Gaillard, I. The Complex Fine-Tuning of K+ Fluxes in Plants in Relation to Osmotic and Ionic Abiotic Stresses. Int. J. Mol. Sci. 2019, 20, 715.

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