ULTRAVIOLET-INDUCED APOCHLOROSIS AND PHOTOREACTIVATION IN TWO STRAINS OF EUGLENA GRACILIS* |
| |
| Authors: | J R Cook † |
| |
| Institution: | Laboratory of Nuclear Medicine and Radiation Biology of the Department of Biophysics and Nuclear Medicine, School of Medicine, University of California, Los Angeles |
| |
| Abstract: | Abstract— Very low doses of ultraviolet irradiation result in a complete loss of the ability to synthesize chlorophyll in two closely related strains of Euglena gracilis (var. hacillaris and strain Z). Both strains are equally sensitive in this response under non-photoreactivating conditions. The ability to synthesize chlorophyll is completely photoreactivated by visible light in E. grncilis var. bacillaris , even after lethal doses of u.v.: the Z strain. however, while photoreactivable following low doses of u.v., remains bleached after doses adequate to kill only 10–20 per cent of the cells. |
| |
| Keywords: | |
|
|
