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Plant and Cell Physiology, 1986, Vol. 27, No. 5 887-894
© 1986

Article

Inhibition of Motility in the Cyanobacterium, Phormidium uncinatum, by Solar and Monochromatic UV Irradiation

Donat-P. Häder1,4, Masakatsu Watanabe2 and Masaki Furuya2,3

1Philipps-Universilät, Fachbereich Biologic, Botanik, Karl v. Frisch Str. D-3550 Marburg, Federal Republic of Germany
2National Institute for Basic Biology, Okazaki National Research Institutes Okazaki, Aichi 444, Japan

4 To whom all correspondence should be addressed.

The effect of solar radiation and monochromatic UV radiation on the motility of the filamentous cyanobacterium Phormidium uncinatum was determined. Solar radiation (mid-day, in midsummer at a location near Lisboa, Portugal) was found to impair motility within about 30 min. This effect is neither a result of a temperature increase nor of visible light. The spectral sensitivity determined using the Okazaki Largé Spectrograph shows the maximal effectiveness of radiation of ≤300 nm. The short time requirement for the response and the lack of any photoreactivation of motility argues against DNA being the UV target. Investigations using reagents diagnostic of superoxide free radicals and singlet oxygen failed to confirm the involvement of photodynamic effects as the molecular mechanism causing UV inhibition of motility.

3Present address: Biology Department, Faculty of Science, University of Tokyo, Hongo, Bunkyo-ku, Tokyo 113, Japan

(Received March 15, 1986; Accepted April 25, 1986)
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