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Abstract

In this opinion article, we challenge the traditional view that breeding for reduced Cl− uptake would benefit plant salinity tolerance. A negative correlation between shoot Cl− concentration and plant biomass does not hold for halophytes – naturally salt tolerant species. We argue that, under physiologically relevant conditions, Cl− uptake requires plants to invest metabolic energy, and that the poor selectivity of Cl−-transporting proteins may explain the reported negative correlation between Cl− accumulation and crop salinity tolerance. We propose a new paradigm: salinity tolerance could be achieved by improving the selectivity of some of the broadly selective anion-transporting proteins (e.g., for NO3− > Cl−), alongside tight control of Cl− uptake, rather than targeting traits mediating its efflux from the root.

Item Type:	Article
Authors/Creators:	Bazihizina, N and Colmer, TD and Cuin, TA and Mancuso, S and Shabala, S
Keywords:	salinity, halophytes, chloride
Journal or Publication Title:	Trends in Plant Science
Publisher:	Elsevier Science London
ISSN:	1360-1385
DOI / ID Number:	10.1016/j.tplants.2018.11.003
Copyright Information:	Copyright 2018 Elsevier Ltd.
Related URLs:	Google Scholar: Shabala, S UTAS Profile: Shabala, S
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