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Regulation of potassium transport in plants under hostile conditions: implications for abiotic and biotic stress tolerance

Citation

Shabala, S and Pottosin, I, Regulation of potassium transport in plants under hostile conditions: implications for abiotic and biotic stress tolerance, Physiologia Plantarum, 151, (3) pp. 257-279. ISSN 0031-9317 (2014) [Refereed Article]

Copyright Statement

Copyright 2014 Scandinavian Plant Physiology Society

DOI: doi:10.1111/ppl.12165

Abstract

Intracellular potassium homeostasis is a prerequisite for the optimal operation of plant metabolic machinery and plant’s overall performance. It is controlled by K+ uptake, efflux and intracellular and long-distance relocation, mediated by a large number of K+-selective and non-selective channels and transporters located at both plasma and vacuolar membranes. All abiotic and biotic stresses result in a significant disturbance to intracellular potassium homeostasis. In this work, we discuss molecular mechanisms and messengers mediating potassium transport and homeostasis focusing on four major environmental stresses: salinity, drought, flooding and biotic factors. We argue that cytosolic K+ content may be considered as one of the ‘master switches’ enabling plant transition from the normal metabolism to ‘hibernated state’ during first hours after the stress exposure and then to a recovery phase. We show that all these stresses trigger substantial disturbance to K+ homeostasis and provoke a feedback control on K+ channels and transporters expression and posttranslational regulation of their activity, optimizing K+ absorption and usage, and, at the extreme end, assisting the programmed cell death. We discuss specific modes of regulation of the activity of K+ channels and transporters by membrane voltage, intracellular Ca2+, reactive oxygen species, polyamines, phytohormones and gasotransmitters, and link this regulation with plantadaptive responses to hostile environments.

Item Details

Item Type:Refereed Article
Keywords:stress, adaptation, potassium
Research Division:Biological Sciences
Research Group:Plant Biology
Research Field:Plant Physiology
Objective Division:Expanding Knowledge
Objective Group:Expanding Knowledge
Objective Field:Expanding Knowledge in the Biological Sciences
Author:Shabala, S (Professor Sergey Shabala)
Author:Pottosin, I (Professor Igor Pottosin)
ID Code:93066
Year Published:2014
Web of Science® Times Cited:103
Deposited By:Tasmanian Institute of Agriculture
Deposited On:2014-07-09
Last Modified:2017-11-03
Downloads:0

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