Abstract
Photosynthetic mutants ofEuglena gracilis obtained by N-methyl-N′-nitro-N-nitrosoguanidine (MNNG) or nitrovin treatment were treated secondarily with MNNG and bleached mutants were isolated. In all mutant strains maintained in the light-grown condition some remnants of plastids were always observed. However, there are differences in the internal organization of secondary mutants between samples taken for examination after 15 and 200 generations of subcultivation. On the other hand, there are no differences in the internal organization of secondary mutants derived from primary photosynthetic mutants and bleached mutants induced directly from wild-type euglenas by MNNG treatment.
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