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https://hdl.handle.net/2440/98223
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Type: | Journal article |
Title: | Uncoupling of sodium and chloride to assist breeding for salinity tolerance in crops |
Author: | Genc, Y. Oldach, K. Taylor, J. Lyons, G. |
Citation: | New Phytologist, 2016; 210(1):145-156 |
Publisher: | Wiley |
Issue Date: | 2016 |
ISSN: | 1469-8137 1469-8137 |
Statement of Responsibility: | Yusuf Genc, Klaus Oldach, Julian Taylor and Graham H. Lyons |
Abstract: | The separation of toxic effects of sodium (Na+) and chloride (Cl−) by the current methods of mixed salts and subsequent determination of their relevance to breeding has been problematic. We report a novel method (Na+ humate) to study the ionic effects of Na+ toxicity without interference from Cl−, and ionic and osmotic effects when combined with salinity (NaCl). Three cereal species (Hordeum vulgare, Triticum aestivum and Triticum turgidum ssp. durum with and without the Na+ exclusion gene Nax2) differing in Na+ exclusion were grown in a potting mix under sodicity (Na+ humate) and salinity (NaCl), and water use, leaf nutrient profiles and yield were determined. Under sodicity, Na+-excluding bread wheat and durum wheat with the Nax2 gene had higher yield than Na+-accumulating barley and durum wheat without the Nax2 gene. However, under salinity, despite a 100-fold difference in leaf Na+, all species yielded similarly, indicating that osmotic stress negated the benefits of Na+ exclusion. In conclusion, Na+ exclusion can be an effective mechanism for sodicity tolerance, while osmoregulation and tissue tolerance to Na+ and/or Cl− should be the main foci for further improvement of salinity tolerance in cereals. This represents a paradigm shift for breeding cereals with salinity tolerance. |
Keywords: | chloride (Cl¯); ionic; osmotic; salinity; sodicity; sodium (Na⁺); sodium humate; tolerance |
Rights: | © 2015 Commonwealth of Australia, New Phytologist © 2015 New Phytologist Trust |
DOI: | 10.1111/nph.13757 |
Published version: | http://dx.doi.org/10.1111/nph.13757 |
Appears in Collections: | Agriculture, Food and Wine publications Aurora harvest 3 |
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