Salt tolerance in the halophyte Suaeda maritima L. Dum. - The maintenance of turgor pressure and water-potential gradients in plants growing at different salinities

Clipson, N J W, Tomos, A D, Flowers, T J and Jones, R G Wyn (1985) Salt tolerance in the halophyte Suaeda maritima L. Dum. - The maintenance of turgor pressure and water-potential gradients in plants growing at different salinities. Planta, 165 (3). pp. 392-396. ISSN 0032-0935

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Abstract

Osmotic potentials and individual epidermal cell turgor pressures were measured in the leaves of seedlings of Suaeda maritima growing over a range of salinities. Leaf osmotic potentials were lower (more negative) the higher the salt concentration of the solution and were lowest in the youngest leaves and stem apices, producing a gradient of osmotic potential towards the apex of the plant. Epidermal cell turgor pressures were of the order of 0.25 to 0.3 MPa in the youngest leaves measured, decreasing to under 0.05 MPa for the oldest leaves. This pattern of turgor pressure was largely unaffected by external salinity. Calculation of leaf water potential indicated that the gradient between young leaves and the external medium was not altered by salinity, but with older leaves, however, this gradient diminished from being the same as that for young leaves in the absence of NaCl, to under 30% of this value at 400 mM NaCl. These results are discussed in relation to the growth response of S. maritima.

Item Type: Article
Additional Information: Times Cited: 46 Clipson, njw tomos, ad flowers, tj jones, rgw
Schools and Departments: School of Life Sciences > Evolution, Behaviour and Environment
Subjects: Q Science
Depositing User: Catrina Hey
Date Deposited: 23 May 2012 08:32
Last Modified: 30 Nov 2012 17:12
URI: http://sro.sussex.ac.uk/id/eprint/39021
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