2008
DOI: 10.1590/s0001-37652008000400014
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Abstract: This work aimed to evaluate density of associative diazotrophic bacteria populations in soil and grass root samples from heavy metal contaminated sites, and to characterize isolates from these populations, both, phenotypically (Zinc, Cadmium and NaCl tolerance in vitro, and protein profiles) and genotypically (16S rDNA sequencing), as compared to type strains of known diazotrophic species. Densities were evaluated by using NFb, Fam and JNFb media, commonly used for enrichment cultures of diazotrophic bacteria.… Show more

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Cited by 15 publications
(5 citation statements)
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“…In environments contaminated with heavy metals, diverse bacteria are found that are tolerant to high heavy metal concentrations in vitro and have a high capacity to remove these metals (Moreira et al, 2008;Chien et al, 2011;Andreazza et al, 2012). This ability of the bacteria is expressed through different mechanisms, such as efflux pumps, thione production, and enzyme activity (Zoropogui et al, 2008;Hynninen et al, 2009), varying according to the strains and metal evaluated.…”
Section: Introductionmentioning
confidence: 99%
“…In environments contaminated with heavy metals, diverse bacteria are found that are tolerant to high heavy metal concentrations in vitro and have a high capacity to remove these metals (Moreira et al, 2008;Chien et al, 2011;Andreazza et al, 2012). This ability of the bacteria is expressed through different mechanisms, such as efflux pumps, thione production, and enzyme activity (Zoropogui et al, 2008;Hynninen et al, 2009), varying according to the strains and metal evaluated.…”
Section: Introductionmentioning
confidence: 99%
“…Diazotrophic bacteria that live in consortium with various types of plants are able to degrade toxic compounds inside the roots [ 74 ]. These microbial populations are also exposed to several toxic organic molecules that occur naturally in the soil, such as phenols, terpenes, alkaloids, and products of anthropogenic origin, besides other molecules found in the soil from the degradation of lignin and humic acids [ 75 ]. Thus, the biodiversity of such microorganisms may represent a potential source for biodegradation of environments contaminated with organic pollutants and, consequently, the production of BS [ 76 ].…”
Section: Underexplored Bacterial Groups As Source Of Novel Bsmentioning
confidence: 99%
“…A mistura que parece ser menos tóxica foi a Cd/Cr pois das 4 bactérias 3 cresceram neste meio. Moreira et al (2008) não obtiveram crescimento para estirpes de Azospirillum na mistura de 54,1 mg L -1 de Cd e 500 mg L -1 de Zn.…”
Section: Associação Entre Metaisunclassified
“…Fungos são usualmente mais resistentes que as bactérias e os liquens possuem atividade da nitrogenase em populações de BFN assimbiotícas (cianobactérias e bactérias aeróbicas heterotróficas), crescidas em solo tratado com lodo de esgoto e contaminado com metais. Os autores obtiveram correlação negativa entre atividade da nitrogenase e concentração no solo de Zn, Cd e Cu.No trabalho deMoreira et al (2008), Azospirillum brasiliense, Azospirillum lipoferum e Azospirillum amazonense exibiram tolerância a 1000 mg L -1 Zn +2 e 60 mg L -1 Cd +2 em meio de cultura. Quando houve a associação de Zn e Cd em meio de cultura, conforme foi aumentando a concentração dos dois metais foi reduzindo o número de estirpes selecionadas.…”
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