New evidence for the mechanism of phototactic orientation of Euglena gracilis

New evidence for the mechanism of phototactic orientation of Euglena gracilis

When rotated horizontally in a cuvette in a strong lateral light beam, the flagellate Euglena gracilis effectively corrects its course and shows negative phototaxis, provided the angular velocity does not exceed 20 degree s super(-1). Faster rotations cannot be corrected efficiently. In two strong l...

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Bibliographic Details
Published in:Current microbiology Vol. 14; no. 3; pp. 157 - 163
Main Authors: Hader, D.P, Lebert, M, Di Lena, M.R
Format: Journal Article
Language:English
Published: New York, NY Springer 01-01-1986
Subjects:
ACTIVIDAD ENZIMATICA
ACTIVITE ENZYMATIQUE
Biological and medical sciences
Cell motion
Cell physiology
ENZYMIC ACTIVITY
Euglena gracilis
Freshwater
FRUCTOFURANOSIDASA
FRUCTOFURANOSIDASE
Fundamental and applied biological sciences. Psychology
GENE
GENES
MUTACION
MUTATION
Plant physiology and development
SACCHAROMYCES CEREVISIAE
Pyrrophycophyta
Phototaxis
Cytoplasmic movement
Algae
Thallophyta
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Summary:When rotated horizontally in a cuvette in a strong lateral light beam, the flagellate Euglena gracilis effectively corrects its course and shows negative phototaxis, provided the angular velocity does not exceed 20 degree s super(-1). Faster rotations cannot be corrected efficiently. In two strong light beams of equal illuminance perpendicular to each other, the cells move along the resultant away from the light beams. Decreasing the illuminance of one beam causes increasing numbers of the organisms to orient with respect to the stronger light source. Externally applied electric dc fields have no effect on positive or negative phototaxis; this supports the hypothesis that electrical potential changes are not involved in the sensory transduction chain of photoorientation in Euglena .
Bibliography:8725755
F60
ObjectType-Article-1
SourceType-Scholarly Journals-1
ObjectType-Feature-2
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ISSN:0343-8651
1432-0991
DOI:10.1007/BF01568368