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- Title
The effect of divalent cations on Na<sup>+</sup> tolerance in Charophytes. I: <em>Chara buckellii</em>.
- Authors
Hoffmann, R.; Bisson, M. A.
- Abstract
The comparative Na+ tolerance of Chara buckellii cultured in freshwater (FW) or artificial Waldsea water (AWW, which contains about 110 mol m-3 each Na+, Mg2+, Cl- and SO4,2-) was tested with respect to the external Na+ to Ca2+ ratio (Na:Ca). Fifty per cent of FW cells subjected to 70 mol m-3 NaCl, which raised Na:Ca from 10:1 to 700:1 and the external osmotic pressure from 0.024 to 0.402 MPa, died within 6 d. Death was associated with the loss of Na/K selectivity, H+-pump activity and turgor. Restoration of Na:Ca to 10:1 in high Na+ medium with CaCI2 ensured 100% survival and maintained H+-pump activity and Na/K selectivity of FW cells. Turgor was regulated within 3 d with net uptake of Na+, K+ and Cl- in the vacuole. Mg2+was not as effective as Ca2+ in enhancing survival or maintaining H+-pump activity and Na/K selectivity of FW cells in the presence of elevated Na+. However, turgor was regulated within 3 d by accumulation of Cl- and an unknown cation in the vacuole. All AWW cells subjected to an increase of 70 mol m-3 NaCl, which raised Na:Ca from 16:1 to 25:1 and the external osmotic pressure from 0.915 to 1.22 MPa, survived and maintained H[sup+]-pump activity. Turgor was regulated within 6 d by accumulating Na+, K+and Cl- in the vacuole. All AWW cells subjected to 70 mol m-3 NaCl in a medium in which Na:Ca was equal to 700:1 survived and maintained H+-pump activity, but showed loss of Na/K selectivity. Turgor was regulated with an unknown osmoticum(a) within 6 d.
- Subjects
CHARA; PHYSIOLOGICAL effects of sodium; CHARACEAE; TURGOR; CHAROPHYTA
- Publication
Plant, Cell & Environment, 1988, Vol 11, Issue 6, p461
- ISSN
0140-7791
- Publication type
Article
- DOI
10.1111/j.1365-3040.1988.tb01784.x