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The effects of propidium on nuclear and mitochondrial mutation induced in yeast by manganese.

Manganese caused mitotic gene conversion and reverse mutation in nuclear genes of yeast Saccharomyces cerevisiae strain D7. Respiration-deficient (petite) mutation and antibiotic-resistant mutations were also induced by treatment with manganese. The presence of propidium had no effect on mitotic gene conversion and reverse mutation induced by manganese. In the case of mitochondrial mutagenesis by manganese, additional petites were produced and induction of antibiotic-resistant mutants were reduced by half when propidium was present during culture. It seems that propidium affects only mitochondrial mutagenesis, not nuclear mutagenesis.