Regulation of K+ nutrition in plants

Modern agriculture relies on mineral fertilization. Unlike other major macronutrients, potassium (K+) is not incorporated into organic matter but remains as soluble ion in the cell sap contributing up to 10% of the dry organic matter. Consequently, K+ constitutes a chief osmoticum to drive cellular...

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1. Verfasser: Ragel de la Torre, Paula (VerfasserIn)
Dokumenttyp: Article (Journal)
Sprache:Englisch
Veröffentlicht: 20 March 2019
In: Frontiers in plant science
Year: 2019, Jahrgang: 10
ISSN:1664-462X
DOI:10.3389/fpls.2019.00281
Online-Zugang:Verlag, Volltext: https://doi.org/10.3389/fpls.2019.00281
Verlag, Volltext: https://www.frontiersin.org/articles/10.3389/fpls.2019.00281/full
Volltext
Verfasserangaben:Paula Ragel, Natalia Raddatz, Eduardo O. Leidi, Francisco J. Quintero and José M. Pardo

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520 |a Modern agriculture relies on mineral fertilization. Unlike other major macronutrients, potassium (K+) is not incorporated into organic matter but remains as soluble ion in the cell sap contributing up to 10% of the dry organic matter. Consequently, K+ constitutes a chief osmoticum to drive cellular expansion and organ movements, such as stomata aperture. Moreover, K+ transport is critical for the control of cytoplasmic and luminal pH in endosomes, regulation of membrane potential, and enzyme activity. Not surprisingly, plants have evolved a large ensemble of K+ transporters with defined functions in nutrient uptake by roots, storage in vacuoles, and ion translocation between tissues and organs. This review describes critical transport proteins governing K+ nutrition, their regulation and coordinated activity, and summarizes our current understanding of signaling pathways activated by K+ starvation. 
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