Modification of fatty acid composition in halophilic antarctic microalgae

The major fatty acids in two Dunaliella isolates originating from Antarctic hypersaline lakes were 18:3 ω3, 16:0, 16:4 ω3. 18:1 ω9, 18:2 ω6, and 16:1 ω7. The relative amount of individual fatty acids was modified by partially or fully replacing ionic osmotic pressure (Na +, K + and Cl −) with molecu...

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Bibliographic Details
Published in:Phytochemistry 1998-11, Vol.49 (5), p.1249-1252
Main Authors: Xu, Xin-Qing, Beardall, John, Hallam, Neil D
Format: Article
Language:English
Subjects:
Animal and plant ecology
Animal, plant and microbial ecology
Antarctica
Autoecology
Biological and medical sciences
Brackish
cations
chemical composition
chlorides
Chlorophyceae
culture media
Dunaliella
fatty acids
Fundamental and applied biological sciences. Psychology
hypersalinity
lakes
Marine
microalga
osmotic pressure
Plant physiology and development
Plants and fungi
potassium
salinity
sodium
sorbitol
unsaturated fatty acids
Water and solutes. Absorption, translocation and permeability
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Summary:The major fatty acids in two Dunaliella isolates originating from Antarctic hypersaline lakes were 18:3 ω3, 16:0, 16:4 ω3. 18:1 ω9, 18:2 ω6, and 16:1 ω7. The relative amount of individual fatty acids was modified by partially or fully replacing ionic osmotic pressure (Na +, K + and Cl −) with molecular osmotic pressure (sorbitol) in the growth medium. The effects of sorbitol on the extent of cellular fatty acid unsaturation differed in the two isolates. The results suggest that the appropriate environment necessary for the growth of these halophilic species is a certain level of osmotic pressure in the medium, but that this can be provided by either ionic or molecular osmotic pressure, or a mixture of both.
ISSN:0031-9422
1873-3700
DOI:10.1016/S0031-9422(98)00117-4