Abstract

Phosmet, the active component of the organophosphorus insecticide Decemtione EK 20, was shown to be mutagenic in the standard Ames Salmonella/mammalian microsome assay in the absence and presence of metabolic activation. It appears to be a direct mutagen inducing base substitution mutations (TA100) as well as a weak frameshift mutagen (TA97). This compound was genotoxic in the Saccharomyces cerevisiae D7 strain. It significantly increase reverse mutation, mitotic crossing-over and slightly, but not significantly, increased gene conversion at the highest concentration used.

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