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Archives of Microbiology

, Volume 141, Issue 2, pp 159–163 | Cite as

Effects of UV-B on motility and photobehavior in the green flagellate, Euglena gracilis

  • Donat-P. Häder
Original Papers

Abstract

UV-B inhibits the motility of the green flagellate, Euglena gracilis, at fluences rates higher than those expected to occur in the natural sunlight even when the stratospheric ozone layer is partially reduced by manmade pollutants. The phototactic orientation of the cells, however, is drastically impaired by only slightly enhanced levels of UV-B irradiation. Since only negative phototaxis (movement away from a strong light source) is impaired while positive phototaxis (movement toward a weak light source) is not, the delicate balance by which the organisms adjust their position in their habitat is disturbed. Under these conditions the cells are unable to retreat from hazardous levels of radiation and are eventually killed not by the UV-B irradiation but by photobleaching of their photosynthetic pigments in the strong daylight at the surface.

Key words

Absorption Eulena gracilis Flagellate Fluorescence Motility Phobic response Photomovement Phototaxis UV-B 

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Copyright information

© Springer-Verlag 1985

Authors and Affiliations

  • Donat-P. Häder
    • 1
  1. 1.Fachbereich Biologie-BotanikMarburgGermany

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