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Thirty-seven carbofuran-degrading bacteria were isolated from agricultural soils, and their genetic and phenotypic characteristics were investigated. The isolates were able to utilize carbofuran as a sole source of carbon and energy. Analysis of the 16S rRNA gene sequence indicated that the isolates were related to members of the genera Rhodococcus, Sphingomonas, and Sphingobium, including new types of carbofuran-degrading bacteria, Bosea and Microbacterium. Among the 37 isolates, 15 different chromosomal DNA patterns were obtained by polymerase chain reaction (PCR) amplification of repetitive extragenic palindromic (REP) sequences. Five of the 15 representative isolates were able to degrade carbofuran phenol, fenoxycarb,and carbaryl, in addition to carbofuran. Ten of the 15representative isolates had 1 to 8 plasmids. Among the 10plasmid-containing isolates, plasmid-cured strains were obtained from 5 strains. The cured strains could not degrade carbofuran and other pesticides anymore, suggesting that the carbofuran degradative genes were on the plasmid DNAs in these strains. When analyzed with PCR amplification and dot-blot hybridization using the primers targeting for the previously reported carbofuran hydrolase gene (mcd),all of the isolates did not show any positive signals,suggesting that their carbofuran hydrolase genes had no significant sequence homology with the mcd gene.

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