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Effects of increased salinity on gravitaxis in Euglena gracilis
Peter Richter1, Anke Börnig, Christine Streb
1Institut für Botanik und Pharmazeutische Biologie, Friedrich-Alexander-Universität, Staudtstr. 5, D-91058 Erlangen, Germany.
Journal of Plant Physiology
|July 23, 2003
Summary
Increased salinity affects Euglena gracilis gravitaxis. Moderate salt enhances negative gravitaxis, while high salt induces a persistent positive gravitaxis and affects pigmentation.
Area of Science:
- Microbiology
- Cell Biology
- Environmental Science
Background:
- Euglena gracilis exhibits phototactic and gravitactic behaviors to regulate its position.
- Cellular responses, including gravitaxis, can shift based on environmental cues like solar radiation.
Purpose of the Study:
- To investigate the impact of elevated salinity on the gravitactic behavior of Euglena gracilis.
- To understand how salinity influences cell motility, velocity, and orientation.
Main Methods:
- Exposure of Euglena gracilis cultures to varying salt concentrations.
- Observation and measurement of cell motility, velocity, and gravitactic orientation.
- Analysis of cellular pigmentation changes via spectral analysis.
Main Results:
- Salt concentrations up to 10 g/L enhanced negative gravitaxis, motility, and velocity.
- Higher concentrations (around 15 g/L) induced a switch to positive gravitaxis, which persisted after returning to normal conditions.
- Salinity above 20 g/L caused motility loss and palmella formation, with recovery leading to pronounced positive gravitaxis and altered pigmentation.
Conclusions:
- Salinity is a significant environmental factor modulating Euglena gracilis gravitaxis.
- Induced positive gravitaxis and pigmentation changes can be long-lasting.
- Euglena gracilis demonstrates remarkable adaptability to salinity stress, with implications for understanding environmental responses in microorganisms.