Regulation of K+ Nutrition in Plants

Autor: Paula Ragel, Natalia Raddatz, Eduardo O. Leidi, Francisco J. Quintero, José M. Pardo
Jazyk: angličtina
Rok vydání: 2019
Předmět:
Zdroj: Frontiers in Plant Science, Vol 10 (2019)
Druh dokumentu: article
ISSN: 1664-462X
DOI: 10.3389/fpls.2019.00281
Popis: 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.
Databáze: Directory of Open Access Journals