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Friend or Foe? Chloride patterning in halophytes


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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 |
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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. |
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