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Updated: Jun 9, 2025

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Published on: March 5, 2019
Redefining the role of sodium exclusion within salt tolerance
Sebastian Garcia-Daga1, Stuart J Roy2, Matthew Gilliham3
1School of Agriculture, Food and Wine & Waite Research Institute, University of Adelaide, Urrbrae, SA 5064, Australia; School of Biosciences, University of Nottingham, Sutton Bonnington, LE12 5RD, UK; ARC Centre of Excellence in Plants for Space, University of Adelaide, Urrbrae, SA 5064, Australia.
Abstract:
Salt contamination of soils and irrigation water is a significant environmental concern for crop production. Leaf sodium (Na+) exclusion is commonly proposed to be a key subtrait of salt tolerance for many crop plants. High-Affinity Potassium (K+) Transporter 1 (HKT1) proteins have previously been identified as major controllers of leaf Na+ exclusion across diverse species. However, leaf Na+ exclusion does not always correlate with salt tolerance. We discuss literature which shows leaf Na+ accumulation can, in some circumstances, be tolerated without a detrimental effect on yield when HKT1 still functions to exclude Na+ from reproductive tissues. We conclude that, by having an ultimate role in the protection of reproductive performance, HKT1s' role in adaptation to salinity warrants redefinition.
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