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Modification of ultraviolet sensitivity of the green alga Scenedesmus obliquus (Turpin) Kuetzing by acriflavine

The effect of pre‐ and post‐irradiation treatments with acriflavine on the kinetics of ultraviolet inactivation of the green alga Scenedesmus obliquus (Turpin) Kuetzing has been studied. Acriflavine is found to modify the UV‐doses. Pre‐irradiation treatment of the alga lessens but post‐irradiation treatment adds to the extent of UV‐inactivation. Incorporation of the dye in the algal suspension during irradiation also elicits a protective effect against UV‐inactivation. The observations are suggestive of an instantaneous uptake and incorporation of the dye in UV‐sensitive components of algal cells‐resulting in altered response of the pre‐, during‐, and post‐irradiation dye‐treated alga to UV and provide evidence for the operativity of two repair system, i.e. light‐independent and light‐dependent repair of the lesions in this alga.