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Tracking the influence of long-term chromium pollution on soil bacterial community structures by comparative analyses of 16S rRNA gene phylotypes
Ist Teil von
Research in microbiology, 2009-01, Vol.160 (1), p.1-9
Ort / Verlag
Issy-les-Moulineaux: Elsevier SAS
Erscheinungsjahr
2009
Quelle
MEDLINE
Beschreibungen/Notizen
Bacterial community structures of highly chromium-polluted industrial landfill sites (G1 and G2) and a nearby control site (G3) were assessed using cultivation-dependent and cultivation-independent analyses. Sequencing of 16S rRNA genes discerned a total of 141 distinct operational taxonomic units (OTUs). Twelve different bacterial phyla were represented amongst 35, 34 and 72 different bacterial genera retrieved from sites G1, G2 and G3, respectively. The bacterial community of site G1 consisted of
Firmicutes (52.75%),
Gammaproteobacteria (18%),
Actinobacteria (14.5%),
Bacteriodetes (9.5%) and
Deinococcus-Thermus (5.25%) and that of site G2 consisted of
Firmicutes (31.25%),
Alphaproteobacteria (7%),
Betaproteobacteria (8%),
Gammaproteobacteria (19%),
Deltaproteobacteria (9.5%),
Epsilonproteobacteria (3%),
Actinobacteria (13%),
Bacteriodetes (7.75%) and
Deinococcus-Thermus (1.5%). The bacterial community of site G3 consisted of
Firmicutes (6.25%),
Alphaproteobacteria (7.5%),
Betaproteobacteria (17.25%),
Gammaproteobacteria (29.75%),
Deltaproteobacteria (7.5%),
Epsilonproteobacteria (4%),
Actinobacteria (9.5%),
Bacteriodetes (11.25%),
Gemmatimonadetes (2.5%),
Deinococcus-Thermus (1.8%),
Chloroflexi (1.5%) and
Planctomycetes (1.2%). The phyla of
Gemmatimonadetes,
Chloroflexi and
Planctomycetes were not detected in sites G1 and G2; likewise,
Alpha,
Beta,
Delta and
Epsilon subdivisions of
Proteobacteria were not recovered from site G1. These findings reveal that long-term chromium-induced perturbation results in community shifts towards a dominance of
Firmicutes from
Proteobacteria in the soil environment.