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Journal of Cell Science, Vol 54, 329-339, Copyright © 1982 by Company of Biologists

Submitted on July 1, 1981

Sensory Behaviour in Dictyostelium Discoideum Slugs: Phototaxis and Thermotaxis are not Mediated by a Change in Slug Speed

ELIZABETH SMITH 1, PAUL R. FISHER 2, WARWICK N. GRANT 2, and KEITH L. WILLIAMS 2

1 Biochemistry Department, Faculty of Science, Australian National University, P.O. Box 4, Canberra City, A.C.T. Australia 2601
2 Max-Planck-Institut für Biochemie, D-8033 Martinsried bei München, Federal Republic of Germany

Author for correspondence

The speed of sustained migration of Dictyostelium discoideum slugs was similar in a temperature gradient and at different light intensities, including a light intensity sufficient to cause significant disorientation of slugs. No change was observed in slug speed in the presence of high levels of Slug Turning Factor (STF), a low molecular weight compound through which phototaxis and thermotaxis are mediated. Thus orientation of D. discoideum slugs is not mediated by a sustained changed in slug speed and we propose that slug movement is not directly coupled to tactic responses. Slug speed depended on the size, age and genotype of slugs as well as the nature of the substratum (charcoal-containing water agar versus water agar).

Submitted on July 1, 1981




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[Abstract] [Full Text]


© The Company of Biologists Ltd 1982