High light exposure leads to a sign change in gravitaxis of the flagellate Euglena gracilis

Beitrag in einer Fachzeitschrift


Details zur Publikation

Autor(en): Ntefidou M, Richter P, Streb C, Lebert M, Häder DP
Zeitschrift: 18TH ESA SYMPOSIUM ON EUROPEAN ROCKET AND BALLOON PROGRAMMES AND RELATED RESEARCH
Jahr der Veröffentlichung: 2002
Band: 501
Seitenbereich: 301-302
ISSN: 0379-6566


Abstract


In the absence of other external stimuli the motile, unicellular freshwater flagellate Euglena gracilis normally swims upward in the water column (negative gravitaxis). This behavior is most likely triggered by active physiological orientation mechanisms. Recently it was found that negative gravitaxis often inverts to a positive one upon high light exposure. This response is not mediated by the photoreceptor (the paraxonemal body - PAB), because PAB-free mutants do also show this response after high radiation. It is very likely that the phenomenon is triggered by reactive oxygen species, because in the absence of oxygen no gravitaxis sign change was observed. Also increased salinity inverses the sign of gravitaxis, leading to the assumption that environmental stressors induce the formation of reactive oxygen species, serving as signal molecules.



FAU-Autoren / FAU-Herausgeber

Häder, Donat-Peter Prof. Dr.
Naturwissenschaftliche Fakultät
Lebert, Michael PD Dr.
Lehrstuhl für Zellbiologie
Ntefidou, Maria Dr.
Lehrstuhl für Zellbiologie
Richter, Peter Dr.
Lehrstuhl für Zellbiologie


Zitierweisen

APA:
Ntefidou, M., Richter, P., Streb, C., Lebert, M., & Häder, D.-P. (2002). High light exposure leads to a sign change in gravitaxis of the flagellate Euglena gracilis. 18TH ESA SYMPOSIUM ON EUROPEAN ROCKET AND BALLOON PROGRAMMES AND RELATED RESEARCH, 501, 301-302.

MLA:
Ntefidou, Maria, et al. "High light exposure leads to a sign change in gravitaxis of the flagellate Euglena gracilis." 18TH ESA SYMPOSIUM ON EUROPEAN ROCKET AND BALLOON PROGRAMMES AND RELATED RESEARCH 501 (2002): 301-302.

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