Abstract
The salinity tolerance ofVaucheria dichotoma, a siphonous Xanthophycean alga was investigated. The alga survived an external osmotic potential range between 74 and 1, 176 mOsmol (ca. 2.5 and 40.0 ppt. (parts per thousand]). Turgor pressure was regulated in salinities ranging from 74 to 441 mOsmol. With further increase of the salinity, turgor pressure decreased from 153 to 9 mOsmol (0.44 to 0.08 MPa). At 441 mOsmol salinity the major intracellular ions were present in the following concentrations (mM/l cell water): K+, 145; Na+; 90; sulphate, 91; Cl−, 91. Under the most severe salinity stress (1,176 mOsmol) the ionic concentration increased to (mM/l cell water): K+, 250; Na+, 75; sulphate, 35; Cl−, 351. The content of amino acids: alanine (Ala), threonine (Thr and glutamic acid (Glu) was lower, nerver exceeding 5–11 mM, however; the concentrations were positively correlated with salinity.
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Henschel, D., Kataoka, H. & Kirst, G.O. Osmotic acclimation of the brackish water xanthophyceae,Vaucheria dichotoma (L.) MARTIUS: Inorganic ion composition and amino acids. Bot. Mag. Tokyo 104, 283–295 (1991). https://doi.org/10.1007/BF02488382
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DOI: https://doi.org/10.1007/BF02488382