Journal article Open Access

Friend or Foe? Chloride Patterning in Halophytes

Nadia Bazihizina; Timothy D. Colmer; Tracey Ann Cuin; Stefano Mancuso; Sergey Shabala


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    <subfield code="a">Friend or Foe? Chloride Patterning in Halophytes</subfield>
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    <subfield code="a">Understanding Halophytes for an Agriculture Worth its Salt</subfield>
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    <subfield code="a">&lt;p&gt;In this opinion article, we challenge the traditional view that breeding for reduced Cl&lt;sup&gt;-&lt;/sup&gt;&amp;nbsp;uptake would benefit plant salinity tolerance. A negative correlation between shoot Cl&lt;sup&gt;-&lt;/sup&gt;&amp;nbsp;concentration and plant biomass does not hold for halophytes - naturally salt tolerant species. We argue that, under physiologically relevant conditions, Cl&lt;sup&gt;-&lt;/sup&gt;&amp;nbsp;uptake requires plants to invest metabolic energy, and that the poor selectivity of Cl&lt;sup&gt;-&lt;/sup&gt;-transporting proteins may explain the reported negative correlation between Cl&lt;sup&gt;-&lt;/sup&gt;&amp;nbsp;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 NO&lt;sub&gt;3&lt;/sub&gt;&lt;sup&gt;-&lt;/sup&gt;&amp;gt;Cl&lt;sup&gt;-&lt;/sup&gt;), alongside tight control of Cl&lt;sup&gt;-&lt;/sup&gt;&amp;nbsp;uptake, rather than targeting traits mediating its efflux from the root.&lt;/p&gt;</subfield>
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