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Coordination of potassium uptake and storage in plants

AutorPardo, José M. ; Ragel, Paula ; Rombolá-Caldentey, B.; Andrés, Zaida ; Pérez-Hormaeche, J.; Quintero, Francisco J. ; Cubero, Beatriz ; Leidi, Eduardo O.
Fecha de publicación28-jul-2016
EditorInstitute for Basic Science (Korea)
CitaciónWorkshop on New Challenges in Systems Biosciences. Daegu, Corea. 2016.
ResumenPotassium (K) is an essential nutrient for every living organism, but in plants K reaches organismal contents of up to 10% of dry weight. While cytosolic K is kept at homeostatic concentrations close to 100 mM, surplus K is stored in plant cell vacuoles in large quantities. An array of K transporters and regulators (protein kinases and phosphatases, interacting proteins, diffusive chemical messengers, transcription factors) have been identified as the basic elements underpinning K fluxes, but the regulatory networks involved in controlling K homeostasis in individual cells and whole organisms remain largely unknown. Current evidence indicates that active K uptake (i.e., against the electrochemical K gradient) involves K-H symporters at the plasma membrane (HAK, High-Affinity K transporters) and K/H antiporters (NHX) at the tonoplast [1-3]. These transporters, together with K-selective channels that fine-tune the membrane electrical potential by K uptake and release, share common regulators that are key effectors of K transport and nutrition [4-6].
URIhttp://hdl.handle.net/10261/158852
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