Abstract
The colorless flagellate,Polytomella magna, does not show natural reactions toward light like phototaxis, photophobic response or photokinesis. However, if photosensitizers (e.g. riboflavin) are added to the culture an avoidance response toward a light field is induced. The photodynamic reaction depends on the presence of O2. The action spectra are in good agreement with the absorption spectra of the tested dyes. The photobehavioral response in the presence of riboflavin seems to be based on a negative chemotaxis toward H2O2 which is produced when the dye is irradiated.
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