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Effect of copper on volume regulation in the marine flagellateDunaliella marina

✍ Scribed by H. U. Riisgård

Publisher
Springer-Verlag
Year
1979
Tongue
English
Weight
468 KB
Volume
50
Category
Article
ISSN
0025-3162

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✦ Synopsis

The marine flagellate Dunaliella marina responds to hypotonic media in the same way as animal cells: an initial phase of osmotic swelling occurs, followed by a second, more prolonged phase of cell shrinkage --the volume-regulation phase, m. marina also volume-regulates in hypertonic media. This does not usually occur in animal cells exposed to normal concentrations of K +. Copper concentrations of 2 ppm and higher inhibit regulation of cell volume in m. marina transferred to hypotonic media. This is probably due to reduced cell-membrane permeability to K + and/or CIand not to an interference with the Na+/K + exchange pump. These findings suggest that volume regulation is functionally independent of the Na+/K + exchange pump. The method described herein appears to be a suitable biotest for pollutants, providing specific information on their effects on the permeability of cell membrane.

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