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Plant function and evolutionary biology
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The waterlogging/salinity interaction in higher plants revisited – focusing on the hypoxia-induced disturbance to K+ homeostasis

Edward G. Barrett-Lennard A C and Sergey N. Shabala B
+ Author Affiliations
- Author Affiliations

A Centre for Ecohydrology, School of Plant Biology and Department of Agriculture and Food of Western Australia (M084), The University of Western Australia, 35 Stirling Highway, Crawley, WA 6009, Australia.

B School of Agricultural Science and Tasmanian Institute of Agriculture, Hobart, Tas. 7001, Australia.

C Corresponding author. Email: egbarrettlennard@agric.wa.gov.au

This paper originates from a presentation at the COST WG2 Meeting ‘Putting halophytes to work – genetics, biochemistry and physiology’ Hannover, Germany, 28–31 August 2012.

Functional Plant Biology 40(9) 872-882 https://doi.org/10.1071/FP12235
Submitted: 8 August 2012  Accepted: 19 November 2012   Published: 11 January 2013

Abstract

Salinity and waterlogging (root-zone hypoxia) are abiotic stresses that often occur together on saltland. It is widely recognised that these two factors interact to increase Na+ and/or Cl concentrations in shoots, which can have adverse effects on plant growth and survival. This review expands on this understanding, providing evidence that the adverse effects of the interaction are also associated with a disturbance to plant K+ homeostasis. This conclusion is based on a comparative analysis of changes in ion concentrations and growth reported in the literature between species (glycophytes vs halophytes) and within a single species (Hordeum marinum L.). Comparisons between species show that hypoxia under saline conditions causes simultaneous increases in Na+ and Cl concentrations and decreases in K+ concentrations in shoots and that these changes can all be related to changes in shoot dry mass. Comparisons between accessions of a single species (Hordeum maritima L.) strengthen the argument, with increases in Na+ and decreases in K+ being related to decreases in shoot relative growth rate.

Additional keywords: chloride transport, ion transport, flooding, potassium transport, salinity, sodium transport.


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