title: Diversity of Burkholderia isolates from woodland rhizosphere environments.
abstract: OBJECTIVE
  Determination of genetic diversity among UK Burkholderia cepacia isolates from various environmental niches, principally woodland tree rhizospheres and onions.
  
  
  RESULTS
  Genus determination was made using polymerase chain reaction (PCR) amplification and fatty acid methyl ester profiling. Genetic diversity was investigated by repetitive sequence genetic PCR fingerprinting. Several onion isolates were similar to clinical isolates but others were diverse. Some environmental isolates were possibly synonymous with B. cepacia and B. gladioli but most from woodland rhizospheres were distinct and clustered together. The 16S rRNA genes of representatives from these clusters were PCR amplified, sequenced and phylogenetically compared with all known Burkholderia and related species. This revealed that the rhizospheric isolates had closest affinity with Burkholderia spp. with known bioremediative and biocontrol capabilities and were unrelated to taxa comprising plant or human pathogenic strains.
  
  
  CONCLUSIONS
  All of the analyses investigated revealed that environmental and onion isolates of B. cepacia complex bacteria are genetically diverse but that woodland rhizospheric isolates are related to each other and unrelated to plant or human pathogenic strains.
  
  
  CONCLUSIONS
  Woodland rhizospheric isolates of B. cepacia are potentially good candidates for use in bioremediation and biocontrol, as they appear distinct from plant or human pathogenic strains.
authors.affiliation: Department of Biological Sciences, Imperial College of Science, Technology and Medicine, Sir Alexander Fleming Building, London, UK.
authors.forename: J
authors.initials: J
authors.lastname: Richardson
authors.forename: D E
authors.initials: DE
authors.lastname: Stead
authors.forename: J G
authors.initials: JG
authors.lastname: Elphinstone
authors.forename: R H A
authors.initials: RH
authors.lastname: Coutts
mesh_terms: D019117:Burkholderia / Q000145:classification* / Q000235:genetics / Q000302:isolation & purification; D016172:DNA Fingerprinting / Q000379:methods; D004269:DNA, Bacterial / Q000032:analysis; D004275:DNA, Ribosomal / Q000032:analysis; D014644:Genetic Variation; D006801:Humans; D008969:Molecular Sequence Data; D019697:Onions / Q000382:microbiology*; D010802:Phylogeny; D018517:Plant Roots / Q000382:microbiology*; D016133:Polymerase Chain Reaction; D012336:RNA, Ribosomal, 16S / Q000235:genetics; D012988:Soil Microbiology; D014197:Trees / Q000382:microbiology*
chemical_list: D004269:DNA, Bacterial; D004275:DNA, Ribosomal; D012336:RNA, Ribosomal, 16S