Liquid-holding and recovery from UV-induced damage in Eudorina elegans.

Eudorina elegans does not respond to liquid-holding or to postirradiation medium effects by changes in recovery. A decrease in survival ability is observed if a culture is starved prior to irradiation, or is incubated at 22°C rather than 32°C following UV irradiation. Eudorina loses the ability to photoreactivate UV damage within 10 to 48 h following irradiation, depending upon the pre-and post-UV culture conditions. The results are interpreted as indicating a failure of Eudorina elegans to carry out specific dark repair of UV damage. Some reactivation may occur during cellular DNA synthesis. [ABSTRACT FROM AUTHOR]