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Abstract

Background:Salinity is a global issue threatening agricultural production systems across the globe. While the major focus of plant salinity stress tolerance research has been on sodium, the transport and physiological roles of K+ in plant salt stress response has received less attention. This review attempts to bridge this knowledge gap.Scope:The major emphasis is on newly proposed K+ signalling roles and plant salt tolerance cell- and tissue specificity. In addition to summarizing the importance of K+ retention for plant salt tolerance, we focus on aspects that were not the subject of previous reviews including (1) the importance of HAK/KUP family of transporters in K+ uptake in salt stressed plants and its possible linkage with Ca2+ and ROS signalling; (2) control of xylem K+ loading in salt stressed plants, control of phloem K+ recirculation in salt stressed plants and the potential importance of plants' ability to efficiently coordinate K+ signals between root and shoot; (3) the buffering capacity of the vacuolar K+ pool; and (4) mechanisms of restoring the basal cytosolic K+ levels by coordinated activity of tonoplast K+-permeable channels. Conclusions:Overall, this review emphasises the need to fully understand the newly emerging roles of K+ and regulation of its transport for improving salinity stress tolerance in plants.

Item Type:	Article
Authors/Creators:	Wu, H and Zhang, X and Giraldo, JP and Shabala, S
Keywords:	cell- and tissue- specificity, potassium channels and transporters, potassium homeostasis, potassium retention, programmed cell death, signalling, sodium, salinity
Journal or Publication Title:	Plant and Soil
Publisher:	Kluwer Academic Publ
ISSN:	0032-079X
DOI / ID Number:	10.1007/s11104-018-3770-y
Copyright Information:	Copyright 2018 Springer Nature Switzerland AG
Related URLs:	Google Scholar: Shabala, S UTAS Profile: Shabala, S
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