Molecular mechanisms involved in plant adaptation to low K+ availability
Open Access
- 30 November 2013
- journal article
- review article
- Published by Oxford University Press (OUP) in Journal of Experimental Botany
- Vol. 65 (3), 833-848
- https://doi.org/10.1093/jxb/ert402
Abstract
Potassium is a major inorganic constituent of the living cell and the most abundant cation in the cytosol. It plays a role in various functions at the cell level, such as electrical neutralization of anionic charges, protein synthesis, long- and short-term control of membrane polarization, and regulation of the osmotic potential. Through the latter function, K+ is involved at the whole-plant level in osmotically driven functions such as cell movements, regulation of stomatal aperture, or phloem transport. Thus, plant growth and development require that large amounts of K+ are taken up from the soil and translocated to the various organs. In most ecosystems, however, soil K+ availability is low and fluctuating, so plants have developed strategies to take up K+ more efficiently and preserve vital functions and growth when K+ availability is becoming limited. These strategies include increased capacity for high-affinity K+ uptake from the soil, K+ redistribution between the cytosolic and vacuolar pools, ensuring cytosolic homeostasis, and modification of root system development and architecture. Our knowledge about the mechanisms and signalling cascades involved in these different adaptive responses has been rapidly growing during the last decade, revealing a highly complex network of interacting processes. This review is focused on the different physiological responses induced by K+ deprivation, their underlying molecular events, and the present knowledge and hypotheses regarding the mechanisms responsible for K+ sensing and signalling.Keywords
This publication has 112 references indexed in Scilit:
- Calcium-dependent modulation and plasma membrane targeting of the AKT2 potassium channel by the CBL4/CIPK6 calcium sensor/protein kinase complexCell Research, 2011
- Potassium (K + ) gradients serve as a mobile energy source in plant vascular tissuesProceedings of the National Academy of Sciences of the United States of America, 2010
- A Minimal Cysteine Motif Required to Activate the SKOR K+ Channel of Arabidopsis by the Reactive Oxygen Species H2O2*Journal of Biological Chemistry, 2010
- A rice high-affinity potassium transporter (HKT) conceals a calcium-permeable cation channelProceedings of the National Academy of Sciences of the United States of America, 2010
- CHL1 Functions as a Nitrate Sensor in PlantsCell, 2009
- Heteromeric AtKC1·AKT1 Channels in Arabidopsis Roots Facilitate Growth under K+-limiting ConditionsJournal of Biological Chemistry, 2009
- A protein phosphorylation/dephosphorylation network regulates a plant potassium channelProceedings of the National Academy of Sciences of the United States of America, 2007
- Rice OsHKT2;1 transporter mediates large Na+ influx component into K+-starved roots for growthThe EMBO Journal, 2007
- A Ca 2+ signaling pathway regulates a K + channel for low-K response in ArabidopsisProceedings of the National Academy of Sciences of the United States of America, 2006
- Changes in the kinetics of phosphate and potassium absorption in nutrient-deficient barley roots measured by a solution-depletion techniquePlanta, 1984