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THE KINETICS OF PENETRATION : XVIII. ENTRANCE OF WATER INTO IMPALED HALICYSTIS
1Laboratories of The Rockefeller Institute for Medical Research, New York, and The Bermuda Biological Station for Research, Inc., Bermuda.
The Journal of General Physiology
|October 30, 2009
Summary
Water uptake in Halicystis Osterhoutii cells was measured. Water entry rate remained stable until sea water concentration dropped below 50%, then decreased significantly.
Area of Science:
- * Marine Biology
- * Plant Physiology
- * Cellular Transport
Background:
- * Understanding water movement in marine algae is crucial for cellular function and survival in varying salinity.
- * Halicystis Osterhoutii is a model organism for studying osmotic regulation in marine plants.
Purpose of the Study:
- * To directly measure the rate of water entrance into impaled Halicystis Osterhoutii cells.
- * To investigate how changes in external sea water concentration affect cellular water uptake velocity.
Main Methods:
- * Direct measurement of sap rise in a capillary tube.
- * Experiments conducted using dilute sea waters ranging from 90% to 30% concentration.
Main Results:
- * The velocity constant for water entrance remained stable down to 50% sea water concentration.
- * A marked decrease in the velocity constant was observed in concentrations below 50% sea water.
Conclusions:
- * Halicystis Osterhoutii cells maintain a consistent water uptake rate across a moderate range of salinity.
- * Cellular water transport mechanisms in this alga are sensitive to significant decreases in external osmotic pressure.
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