NEGATIVE PHOTOTAXIS OF Dictyostelium discoideum PSEUDOPLASMODIA IN UV RADIATION |
| |
| Authors: | Donat-P Häder |
| |
| Institution: | Fachbereich Biologie-Botanik, Lahnberge, D–3550 Marburg, W. Germany |
| |
| Abstract: | Abstract— Pseudoplasmodia of the cellular slime mold Dictyostelium discoideum show negative phototactic orientation in lateral ultraviolet radiation. The action spectrum has a peak in the UV-B band near 280 nm. The absorption spectrum shows a prominent peak in the same wavelength range. Thus, negative phototaxis can be easily explained by the assumption that the lens effect, by which D. discoideum slugs detect the light direction, is defeated by the high internal absorption in this wavelength range. |
| |
| Keywords: | |
|
|
