Salt Tolerance in the Halophyte Suaeda maritima (L.) dum. The Effect of Salinity on the Concentration of Sodium in the Xylem

Clipson, N J W and Flowers, T J (1987) Salt Tolerance in the Halophyte Suaeda maritima (L.) dum. The Effect of Salinity on the Concentration of Sodium in the Xylem. New Phytologist, 105 (3). pp. 359-366. ISSN 0028-646X

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Abstract

Rates of ion transport and transpiration were measured during the day and night in whole seedlings of Suaeda maritima growing over a range of salinities, in order to calculate concentrations of sodium and potassium in the xylem during these periods. Mean sodium concentration in the xylem was maximal at 56 mol m−3 Na with an external salinity of 200 mol m−3 NaCl. The sodium concentration in the xylem was greater in the dark than in the light at all external salinities investigated. Comparison of the external sodium with that in the xylem indicated that sodium was more strongly excluded from the transpiration stream as salinity increased. The mean concentration of potassium in the xylem declined as external NaCl concentration increased, although selectivity for potassium increased at higher salinities. Results are discussed in relation to osmotic adjustment in S. maritima.

Item Type: Article
Additional Information: Times Cited: 14 Clipson, njw flowers, tj
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Subjects: Q Science
Depositing User: Catrina Hey
Date Deposited: 22 May 2012 15:58
Last Modified: 30 Nov 2012 17:12
URI: http://sro.sussex.ac.uk/id/eprint/39017
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