Sensitivity of light-grown and dark-grown Euglena cells to gamma-irradiation.
Light-grown cells which contain fully developed chloroplasts were found to be more resistant to gamma-irradiation than dark-grown cells which are devoid of chloroplasts. The radio-resistance of dark-grown cells progressively increased during light-induced development of chloroplasts and, conversely, radio-resistance of light-grown cells decreased progressively with chloroplast de-development during growth in the dark. The presence of chloroplasts seemed to play a major role in the capacity of cells to recover from radiation damage, the efficiency of cellular recovery being correlatable with the degree of chloroplast development.
D002470:Cell Survival / Q000528:radiation effects*; D002736:Chloroplasts / Q000528:radiation effects*; D004260:DNA Repair; D003624:Darkness; D004307:Dose-Response Relationship, Radiation; D005055:Euglena; D005720:Gamma Rays; D008027:Light