Genetic basis of sodium exclusion and sodium tolerance in yeast. A model for plants
- 1 December 1993
- journal article
- Published by Wiley in Physiologia Plantarum
- Vol. 89 (4) , 868-874
- https://doi.org/10.1111/j.1399-3054.1993.tb05298.x
Abstract
A yeast strain carrying disruptions in TRK1 and ENA genes was very sensitive to Na+ because uptake discriminated poorly between K+ and Na+, and Na+ efflux was insignificant. Transformation with TRK1 and ENA1 restored discrimination, Na+ efflux and Na+ tolerance. Increasing external Ca2+ increased Na+ tolerance almost in the same proportion in TRK1 enal cells and in trkl ENAI cells, suggesting an unspecific effect of this cation. By using a vacuolar ATPase mutant, the role of the vacuole in Na+ tolerance was also demonstrated. The yeast model of Na+ exclusion and Na+ tolerance may be extended to plants.Keywords
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