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It is not all about sodium: revealing tissue specificity and signalling roles of potassium in plant responses to salt stress

journal contribution
posted on 2023-05-19, 23:42 authored by Wu, H, Zhang, X, Giraldo, JP, Sergey ShabalaSergey Shabala

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.

History

Publication title

Plant and Soil

Volume

431

Issue

1-2

Pagination

1-17

ISSN

0032-079X

Department/School

Tasmanian Institute of Agriculture (TIA)

Publisher

Kluwer Academic Publ

Place of publication

Van Godewijckstraat 30, Dordrecht, Netherlands, 3311 Gz

Rights statement

Copyright 2018 Springer Nature Switzerland AG

Repository Status

  • Restricted

Socio-economic Objectives

Other plant production and plant primary products not elsewhere classified

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