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

摘要

The effect of solar radiation and monochromatic UV radiation on the motility of the filamentous cyanobacteriumPhormidium uncinatumwas 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 LargéSpectrograph 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 motili