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- Title
Regulation of K<sup>+</sup> Nutrition in Plants.
- Authors
Ragel, Paula; Raddatz, Natalia; Leidi, Eduardo O.; Quintero, Francisco J.; Pardo, José M.
- Abstract
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.
- Subjects
CARRIER proteins; NUTRIENT uptake; MEMBRANE potential; ORGANIC compounds; GOVERNMENT regulation; PREHENSION (Physiology); PLANT nutrition
- Publication
Frontiers in Plant Science, 2019, pN.PAG
- ISSN
1664-462X
- Publication type
Article
- DOI
10.3389/fpls.2019.00281