Genotypic diversity, antibiotic resistance and bacteriocin production of enterococci isolated from rhizospheres

Microbes Environ. 2012;27(4):533-7. doi: 10.1264/jsme2.me12041. Epub 2012 Oct 31.

Abstract

This study aimed to identify and to characterize rhizospheric-derived enterococci. The results showed the prevalence of Enterococcus faecium species (97%) vs. Enterococcus durans (3%). Susceptibility testing for antibiotics showed a low percentage of resistance to erythromycin (3.2%) and tetracycline (11.2%), and intermediate resistance to vancomycin (6.5%). Nevertheless, a high proportion of bacteriocin production was recorded. Furthermore, PCR detection of antibiotic resistance and bacteriocin production-encoding genes was investigated. Pulsed-field gel electrophoresis typing (PFGE) showed a great variability of enterococci in the rhizosphere. Moreover, mutilocus-sequence-typing analysis (MLST) revealed the identification of three new sequence types (STs), which were registered as ST613, ST614 and ST615.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Bacteriocins / biosynthesis
  • Bacteriocins / genetics
  • Bacteriocins / metabolism*
  • Biodiversity
  • Ciprofloxacin / pharmacology
  • Drug Resistance, Multiple, Bacterial / genetics*
  • Enterococcus faecium / drug effects*
  • Enterococcus faecium / genetics
  • Enterococcus faecium / isolation & purification*
  • Erythromycin / pharmacology
  • Genetic Variation
  • Microbial Sensitivity Tests
  • Multilocus Sequence Typing
  • Plant Roots / microbiology*
  • Rhizosphere*
  • Tetracycline / pharmacology
  • Tetracycline Resistance / genetics
  • Vancomycin / pharmacology
  • Vancomycin Resistance / genetics

Substances

  • Bacteriocins
  • Ciprofloxacin
  • Erythromycin
  • Vancomycin
  • Tetracycline