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A bacterium capable of utilizing carbaryl (1-naphthylN -methylcarbamate) as the sole carbon source was isolated from carbaryl-treated soil. This bacterium was characterized taxonomically asArthrobacter and was designated strain RC100. RC100 hydrolyzes theN -methylcarbamate linkage to 1-naphthol, which was further metabolized via salicylate and gentisate. Strain RC100 harbored three plasmids (designated pRC1, pRC2, and pRC3). Mutants unable to degrade carbaryl arose at a high frequency after treating the culture with mitomycin C. All carbaryl-hydrolysis-deficient mutants (Cah− ) lacked pRC1, and all 1-naphthol-utilization-deficient mutants (Nat− ) lacked pRC2. The plasmid-free strain RC107 grew on gentisate as a carbon source. These two plasmids could be transferred to Cah− mutants or Nat− mutants by conjugation, resulting in the restoration of the Cah and Nah phenotypes.

Involvement of Two Plasmids in the Degradation of Carbaryl by Arthrobacter sp. Strain RC100