Phototaxis and Gravitaxis in Euglena gracilis

  • Donat-P. Häder
Part of the NATO ASI Series book series (NSSA, volume 211)


Like many other motile microorganisms, the photosynthetic unicellular flagellate, Euglena gracilis, orients in its habitat using a number of external chemical and physical parameters (Häder, 1988; Nultsch and Häder, 1988). While some microorganisms have been found to move and orient in the water column with the aid of chemical (Berg, 1985; Macnab, 1985) and thermal (Mizuno et al., 1984; Poff, 1985) gradients, the magnetic field of the earth (Ofer et al., 1984; Frankel, 1984; Esquivel and de Barros, 1986) and even electrical currents (Mast, 1911), Euglena mainly orients with respect to light (Diehn et al, 1977; Häder et al, 1981,1986b; Colombetti et al., 1982; Lend et al, 1983) and gravity (Brinkmann, 1968; Häder, 1987a). Recent unpublished experiments failed to demonstrate responses to thermal gradients and the magnetic field of the earth.


Movement Vector Fluence Rate Euglena Gracilis Chain Code Acceleration Force 
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Copyright information

© Plenum Press, New York 1991

Authors and Affiliations

  • Donat-P. Häder
    • 1
  1. 1.Institut für Botanik und Pharmazeutische BiologieFriedrich-Alexander-UniversitätErlangenGermany

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