Gravitaxis in the flagellate Euglena gracilis is controlled by an active gravireceptor
Gravitactic orientation was investigated in the unicellular photosynthetic flagellate, Euglena gracilis, under different accelerations between 0 and 1.5 x g during a recent space flight on board the American shuttle Columbia. The threshold for gravitaxis was found at < or = 0.16 x g. Above the th...
| Veröffentlicht in: | Journal of plant physiology. - 1979. - 146(1995), 4 vom: 04. Juli, Seite 474-80 |
|---|---|
| 1. Verfasser: | |
| Weitere Verfasser: | , , |
| Format: | Aufsatz |
| Sprache: | English |
| Veröffentlicht: |
1995
|
| Zugriff auf das übergeordnete Werk: | Journal of plant physiology |
| Schlagworte: | Comparative Study Journal Article Research Support, Non-U.S. Gov't |
| Zusammenfassung: | Gravitactic orientation was investigated in the unicellular photosynthetic flagellate, Euglena gracilis, under different accelerations between 0 and 1.5 x g during a recent space flight on board the American shuttle Columbia. The threshold for gravitaxis was found at < or = 0.16 x g. Above the threshold the precision of orientation increased with acceleration in a sigmoidal fashion and reached saturation at about 0.32 x g, a behavior typical for physiological receptors. At accelerations above the saturation point the cells were closely aligned with the gravity vector (negative gravitaxis) and deviated more and more as the acceleration decreased. Obviously the gravireceptor responds to an error signal that elicits a course correction, again indicating the involvement of an active physiological gravireceptor. No adaptation of the cells to the conditions of weightlessness could be observed over the duration of the space mission (12 days). After landing, the cells showed a normal gravitactic behavior at 1 x g |
|---|---|
| Beschreibung: | Date Completed 28.04.1998 Date Revised 30.09.2020 published: Print Citation Status MEDLINE |
| ISSN: | 1618-1328 |