Utilize este identificador para referenciar este registo: http://hdl.handle.net/10400.5/5619
Título: Enumeration and characterization of arsenic-tolerant diazotrophic bacteria in a long-term heavy-metal-contaminated soil
Autor: Oliveira, A.
Pampulha, M.E.
Neto, M.M.
Almeida, A.C.
Palavras-chave: arsenic
diazotrophic bacteria
soil bacteria
heavy metals
Data: 2009
Editora: Springer
Citação: "Water, Air & Soil Pollution". ISSN 0049-6979. 200 (2009) 237-243
Resumo: The abundance of arsenic-tolerant diazotrophic bacteria was compared in a long-term contaminated soil versus a non-contaminated one. In addition, the characterization of tolerant diazotrophic bacteria was carried out. Differences in the number of heterotrophic N2 fixers were found between soils. Contaminated soil showed a decrease in the microbial population size of about 80%, confirming the great sensitivity of this group of soil bacteria to metals. However, quantitative analysis of the response to increased doses of arsenic reveals that the proportion of the culturable diazotrophic community tolerant to arsenic was identical for both soils (contaminated and non-contaminated). Twentytwo arsenic-tolerant diazotrophic isolates were obtained and further characterized. 16S ribosomal DNA sequence analysis revealed that these bacterial isolates were distributed among four taxons (Actinobacteria, Firmicutes, γ-Proteobacteria, and β-Proteobacteria). Most genera recovered from the contaminated soil were also found in the uncontaminated soil
Peer review: yes
URI: http://hdl.handle.net/10400.5/5619
ISSN: 0049-6979
Aparece nas colecções:DBEB - Artigos de Revistas

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