Abstract
Concentrations of streptomycin (Sm) which do not affect viability or growth of Euglena gracilis Klebs var. bacillaris Pringsheim bring about the loss of plastid-forming ability in dividing cells and block light-induced chloroplast development from the proplastid in non-dividing cells. Using nitrosoguanidine as a mutagen and phototrophic medium in the light with carbon dioxide and Sm as the selective conditions, we have obtained mutants of Euglena resistant to the action of Sm. These mutants tolerate concentrations of Sm as high as 0.5% (ten times the usual effective concentration) and both plastid-forming ability in dividing cells and plastid development in non-dividing cells are resistant to the antibiotic. No mutants which are Sm-dependent have been obtained. The Sm-resistant mutants sometimes exhibit somewhat reduced chlorophyll levels compared with wild-type but their photosynthetic efficiencies on a chlorophyll basis are comparable.
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