Plant Physiol.
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Plant Physiology 66:1196-1197 (1980)
© 1980 American Society of Plant Biologists

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Short Communication

Effect of Temperature on Glycerol Retention in the Halotolerant Algae Dunaliella and Asteromonas

Klaus Wegmann1, Ami Ben-Amotz and Mordhay Avron

Department of Biochemistry, Weizmann Institute of Science, Rehovot, Israel

Algae of the genera Dunaliella and Asteromonas can maintain extremely high concentration gradients (>104) of glycerol between the intracellular space and the medium. This unique ability is highly temperature-dependent. Treating the algae for several minutes at temperatures exceeding 60 C causes complete release of all the internally held glycerol; 50% release occurs around 50 C, but essentially none is released below 40 C. A similar behavior was observed in several species of Dunaliella, and one of Asteromonas and is independent of the salt concentration of the medium. The underlying mechanism may involve a temperature-dependent conformational transition of a component of the cellular membrane which is essential for glycerol impermeability.

1 Present address: Institut fur Chemische Pflanzenphysiologie, Universitat Tubingen, D-7400 Tubingen, West Germany.




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Copyright © 1980 by the American Society of Plant Biologists