Uncoupling of sodium and chloride to assist breeding for salinity tolerance in crops

被引:52
|
作者
Genc, Yusuf [1 ,2 ]
Oldach, Klaus [1 ,2 ]
Taylor, Julian [2 ]
Lyons, Graham H. [1 ,2 ]
机构
[1] South Australian Res & Dev Inst, Plant Genom Ctr, Waite Campus, Glen Osmond, SA 5064, Australia
[2] Univ Adelaide, Sch Agr Food & Wine, Waite Campus, Glen Osmond, SA 5064, Australia
关键词
chloride (Cl-); ionic; osmotic; salinity; sodicity; sodium (Na+); sodium humate; tolerance; SALT TOLERANCE; DURUM-WHEAT; OSMOTIC ADJUSTMENT; NA+ EXCLUSION; PLANT-GROWTH; BREAD WHEAT; GRAIN-YIELD; HUMIC-ACID; STRESS; SOILS;
D O I
10.1111/nph.13757
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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.
引用
收藏
页码:145 / 156
页数:12
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