Different bacterial groups for biodegradation of three- and four-ring PAHs isolated from a Hong Kong mangrove sediment

Hong, Zhou; Luan, Tian; Zou, Fei; Tam, N.F.Y.

doi:10.1016/j.jhazmat.2007.07.116

Cited by 94 publications

(51 citation statements)

References 33 publications

(39 reference statements)

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“…There is evidence for increased protein expression of RHDs in Mycobacterium strains when exposed to various PAHs (21,26), and phenanthrene has been shown to increase the expression of the nahAc gene in Pseudomonas putida G7 (34). In environmental samples, increases in both nidA and nahAc transcripts could be detected in sediments when PAHs were added (57). The nearly equivalent levels of increased expression of both the phnAc and phnB genes in NA3 when exposed to either phenanthrene or naphthalene suggest that the genes are cotranscribed.…”

Section: Discussionmentioning

confidence: 96%

Characterization of a Polycyclic Aromatic Hydrocarbon Degradation Gene Cluster in a Phenanthrene-Degrading Acidovorax Strain

Singleton

Ramirez

Aitken

2009

Appl Environ Microbiol

125

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Section: Discussionmentioning

confidence: 96%

Characterization of a Polycyclic Aromatic Hydrocarbon Degradation Gene Cluster in a Phenanthrene-Degrading Acidovorax Strain

Singleton

Ramirez

Aitken

2009

Appl Environ Microbiol

125

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“…A few previous studies have addressed the microbial diversity in mangroves, most of them reporting taxonomical groups inhabiting this ecosystem and assessing shifts in the community structures in the face of environmental pressures (9,15,23,42). However, the composition and dynamics of the mangrove microbiome are still scarcely explored and understood in terms of its functional groups (2,13,15,32).…”

Section: Discussionmentioning

confidence: 99%

Abundance and Genetic Diversity of nifH Gene Sequences in Anthropogenically Affected Brazilian Mangrove Sediments

Dias

Silva

Cotta³

et al. 2012

Appl Environ Microbiol

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Although mangroves represent ecosystems of global importance, the genetic diversity and abundance of functional genes that are key to their functioning scarcely have been explored. Here, we present a survey based on the nifH gene across transects of sediments of two mangrove systems located along the coast line of São Paulo state (Brazil) which differed by degree of disturbance, i.e., an oil-spill-affected and an unaffected mangrove. The diazotrophic communities were assessed by denaturing gradient gel electrophoresis (DGGE), quantitative PCR (qPCR), and clone libraries. The nifH gene abundance was similar across the two mangrove sediment systems, as evidenced by qPCR. However, the nifH-based PCR-DGGE profiles revealed clear differences between the mangroves. Moreover, shifts in the nifH gene diversities were noted along the land-sea transect within the previously oiled mangrove. The nifH gene diversity depicted the presence of nitrogen-fixing bacteria affiliated with a wide range of taxa, encompassing members of the Alphaproteobacteria, Betaproteobacteria, Gammaproteobacteria, Firmicutes, and also a group of anaerobic sulfate-reducing bacteria. We also detected a unique mangrove-specific cluster of sequences denoted Mgv-nifH. Our results indicate that nitrogen-fixing bacterial guilds can be partially endemic to mangroves, and these communities are modulated by oil contamination, which has important implications for conservation strategies.

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“…For instance, rhizospheric and sediment microbes are thought to be the major biological components that contribute to the productivity of intertidal mangrove ecosystems. Meanwhile, our group and others have isolated a large number of xenobiotic-degrading bacteria from intertidal wetland sediments (33,35). Nevertheless, microbial ecology studies mainly focus on sulfate-reducing bacteria from Deltaproteobacteria or other limited groups in intertidal sediments (1,21).…”

mentioning

confidence: 99%

Comparison of the Levels of Bacterial Diversity in Freshwater, Intertidal Wetland, and Marine Sediments by Using Millions of Illumina Tags

Wang

Sheng

et al. 2012

Appl Environ Microbiol

741

388

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b Sediment, a special realm in aquatic environments, has high microbial diversity. While there are numerous reports about the microbial community in marine sediment, freshwater and intertidal sediment communities have been overlooked. The present study determined millions of Illumina reads for a comparison of bacterial communities in freshwater, intertidal wetland, and marine sediments along Pearl River, China, using a technically consistent approach. Our results show that both taxon richness and evenness were the highest in freshwater sediment, medium in intertidal sediment, and lowest in marine sediment. The high number of sequences allowed the determination of a wide variety of bacterial lineages in all sediments for reliable statistical analyses. Principal component analysis showed that the three types of communities could be well separated from phylum to operational taxonomy unit (OTU) levels, and the OTUs from abundant to rare showed satisfactory resolutions. Statistical analysis (LEfSe) demonstrated that the freshwater sediment was enriched with Acidobacteria, Nitrospira, Verrucomicrobia, Alphaproteobacteria, and Betaproteobacteria. The intertidal sediment had a unique community with diverse primary producers (such as Chloroflexi, Bacillariophyta, Gammaproteobacteria, and Epsilonproteobacteria) as well as saprophytic microbes (such as Actinomycetales, Bacteroidetes, and Firmicutes). The marine sediment had a higher abundance of Gammaproteobacteria and Deltaproteobacteria, which were mainly involved in sulfate reduction in anaerobic conditions. These results are helpful for a systematic understanding of bacterial communities in natural sediment environments.

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Different bacterial groups for biodegradation of three- and four-ring PAHs isolated from a Hong Kong mangrove sediment

Cited by 94 publications

References 33 publications

Characterization of a Polycyclic Aromatic Hydrocarbon Degradation Gene Cluster in a Phenanthrene-Degrading Acidovorax Strain

Characterization of a Polycyclic Aromatic Hydrocarbon Degradation Gene Cluster in a Phenanthrene-Degrading Acidovorax Strain

Abundance and Genetic Diversity of nifH Gene Sequences in Anthropogenically Affected Brazilian Mangrove Sediments

Comparison of the Levels of Bacterial Diversity in Freshwater, Intertidal Wetland, and Marine Sediments by Using Millions of Illumina Tags

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