Physiological and Metagenomic Characterizations of the Synergistic Relationships between Ammonia- and Nitrite-Oxidizing Bacteria in Freshwater Nitrification

Nitrification plays a crucial role in global nitrogen cycling and treatment processes. However, the relationships between the nitrifier guilds of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) are still poorly understood, especially in freshwater habitats. This study examined...

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Bibliographic Details
Published in:Frontiers in microbiology 2018-02, Vol.9, p.280-280
Main Authors: Cai, Mingwei, Ng, Siu-Kin, Lim, Chee Kent, Lu, Hongyuan, Jia, Yangyang, Lee, Patrick K H
Format: Article
Language:English
Subjects:
ammonia-oxidizing bacteria
biofilter
freshwater
metagenomics
Microbiology
nitrite-oxidizing bacteria
synergistic relationships
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Summary:Nitrification plays a crucial role in global nitrogen cycling and treatment processes. However, the relationships between the nitrifier guilds of ammonia-oxidizing bacteria (AOB) and nitrite-oxidizing bacteria (NOB) are still poorly understood, especially in freshwater habitats. This study examined the physiological interactions between the AOB and NOB present in a freshwater aquarium biofilter by culturing them, either together or separately, in a synthetic medium. Metagenomic and 16S rRNA gene sequencing revealed the presence and the draft genomes of -like AOB as well as -like NOB in the cultures, including the first draft genome of . The nitrifiers exhibited different growth rates with different ammonium (NH ) or nitrite concentrations (50-1,500 μM) and the growth rates were elevated under a high bicarbonate (HCO ) concentration. The half-saturation constant ( for NH ), the maximum growth rate (μ ), and the lag duration indicated a strong dependence on the synergistic relationships between the two guilds. Overall, the ecophysiological and metagenomic results in this study provided insights into the phylogeny of the key nitrifying players in a freshwater biofilter and showed that interactions between the two nitrifying guilds in a microbial community enhanced nitrification.
ISSN:1664-302X
1664-302X
DOI:10.3389/fmicb.2018.00280