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Science 8 December 1995:
Vol. 270. no. 5242, p. 1549
DOI:

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The ability of plants to grow in saline soils is correlated with several physiological features, including ion transport. Rubio et al. (p. 1660) have identified an aspect of ion transport that is required for normal physiology of the plant but leads to sodium-induced toxicity when the plant is grown in the presence of excessive sodium. The HKT1 ion symporter normally transports K+ along with Na+. At high Na+ concentrations, however, HKT1 mediates additional Na+ transport through a low-affinity site at the expense of K+ transport. Mutations in a transmembrane domain resulted in improved ability to discriminate between Na+ and K+ and may contribute to improved salt tolerance.




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Science. ISSN 0036-8075 (print), 1095-9203 (online)