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. 1993 Nov;59(11):3816–3824. doi: 10.1128/aem.59.11.3816-3824.1993

16S rRNA-targeted polymerase chain reaction and oligonucleotide hybridization to screen for Azoarcus spp., grass-associated diazotrophs.

T Hurek 1, S Burggraf 1, C R Woese 1, B Reinhold-Hurek 1
PMCID: PMC182536  PMID: 7506895

Abstract

Phylogenetic analyses after reverse transcriptase sequencing of 16S rRNA of nitrogen-fixing, grass-associated Azoarcus strains confirmed their affiliation to the beta subdivision of the Proteobacteria. Strains representing three different species formed a phylogenetically coherent unit related to Rhodocyclus purpureus, with actual percent similarities among the three sequences ranging from 93.1 to 97.3%. Within variable regions V2 and V5, we found stretches of sequences considerably conserved within the genus Azoarcus but differing from most other gram-negative bacteria, with the specificity being enhanced when different regions were combined. Genus-specific primers selected from both regions amplified fragments from all but one Azoarcus species in polymerase chain reactions (PCR) but not from any reference strain tested. Primers of lesser specificity generated fragments from members of all five Azoarcus species as well as from some reference strains. Those unspecific amplifications could be differentiated by oligonucleotide hybridization, detecting only fragments generated from Azoarcus strains except strain 6a3, which represents the same group which could not be detected by genus-specific PCR. Thus we propose the application of PCR amplification with 16S rRNA-targeted, genus-specific primers in combination with hybridization of a 16S rRNA-targeted oligonucleotide to PCR-generated fragments as diagnostic tests; this allows an initial screening for presence of members of the genus Azoarcus.

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Selected References

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