Journal of Microbiology

The Microbiological Society of Korea (한국미생물학회)
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Genetic and Phenotypic Diversity of (R/S)-Mecoprop [2-(2-Methyl-4- Chlorophenoxy)Propionic Acid]-Degrading Bacteria Isolated from Soils

  • Lim, Jong-Sung (School of Agricultural Biotechnology, Seoul National University) ;
  • Jung, Mee-Kum (School of Agricultural Biotechnology, Seoul National University) ;
  • Kim, Mi-Soon (School of Agricultural Biotechnology, Seoul National University) ;
  • Ahn, Jae-Hyung (School of Agricultural Biotechnology, Seoul National University) ;
  • Ka, Jong-Ok (School of Agricultural Biotechnology, Seoul National University)
  • Published : 2004.06.01
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Abstract

Twelve mecoprop-degrading bacteria were isolated from soil samples, and their genetic and phenotypic characteristics were investigated. Analysis of 16S rDNA sequences indicated that the isolates were related to members of the genus Sphingomonas. Ten different chromosomal DNA patterns were obtained by polymerase-chain-reaction (PCR) amplification of repetitive extragenic palindromic (REP) sequences from the 12 isolates. The isolates were found to be able to utilize the chiral herbicide meco-prop as a sole source of carbon and energy. While seven of the isolates were able to degrade both (R)-and (S)-mecoprop, four isolates exhibited enantioselective degradation of the (S)-type and one isolate could degrade only the (R)-enantiomer. All of the isolates were observed to possess plasmid DNAs. When certain plasmids were removed from isolates MPll, MP15, and MP23, those strains could no longer degrade mecoprop. This compelling result suggests that plasmid DNAs, in this case, conferred the ability to degrade the herbicide. The isolates MP13, MP15, and MP24 were identified as the same strain; however, they exhibited different plasmid profiles. This indicates that these isolates acquired dif-ferent mecoprop-degradative plasmids in different soils through natural gene transfer.

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References

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