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- Publisher
- Wiley
- Copyright
- Copyright © 1979 Wiley Subscription Services, Inc., A Wiley Company
- ISSN
- 0140-7791
- eISSN
- 1365-3040
- DOI
- 10.1111/j.1365-3040.1979.tb00782.x
- Publisher site
- See Article on Publisher Site
Abstract
Abstract Fluxes of sodium across the plasmalemma and tonoplast of the roots of Eleocharis uniglumis have been measured using 22Na. E. uniglumis (one glumed spike rush) was collected from an estuarine habitat where it was growing in a wide range of salinities (1 mM‐50 mM Na). Compartmental analysis was used to determine sodium concentrations in the cytoplasm and the vacuole. Application of the Ussing‐Teorell equation revealed the presence of sodium pumps in the plasmalemma and the tonoplast. Active sodium transport into the cytoplasm from the bathing medium was found to occur in most of the external sodium concentrations investigated. There also appeared to be active transport of sodium into the cytoplasm from the vacuole. In contrast to halophytes, high levels of sodium appeared to be accumulated in the cytoplasm of E. uniglumis roots.
Journal
Plant Cell & Environment – Wiley
Published: Jun 1, 1979