GENETIC-BASIS OF SODIUM EXCLUSION AND SODIUM TOLERANCE IN YEAST - A MODEL FOR PLANTS

被引:80
作者
HARO, R [1 ]
BANUELOS, MA [1 ]
QUINTERO, FJ [1 ]
RUBIO, F [1 ]
RODRIGUEZNAVARRO, A [1 ]
机构
[1] ESCUELA TECN SUPER INGN AGRON, MICROBIOL LAB, E-28040 MADRID, SPAIN
关键词
ION TRANSPORT; SACCHAROMYCES CEREVISIAE; SODIUM EXCLUSION; SODIUM TOLERANCE; YEAST;
D O I
10.1111/j.1399-3054.1993.tb05298.x
中图分类号
Q94 [植物学];
学科分类号
071001 ;
摘要
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 ena1 cells and in trk1 ENA1 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 Nac exclusion and Na+ tolerance may be extended to plants.
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页码:868 / 874
页数:7
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