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  • Diversity of anammox bacteria and abundance of functional genes for nitrogen cycling in the rhizosphere of submerged macrophytes in a freshwater lake in summer

    Author(s)
    Zhao, Jianwei
    Xu, Yangfan
    Peng, Lei
    Liu, Guanglong
    Wan, Xiaoqiong
    Hua, Yumei
    Zhu, Duanwei
    Hamilton, David P
    Griffith University Author(s)
    Hamilton, David P.
    Year published
    2019
    Metadata
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    Abstract
    Purpose: Submerged plants make an important contribution to nitrogen cycling in lakes including in the rhizosphere microenvironment through microbial activities. The main objective of this study was to investigate the abundance of functional genes for nitrogen cycling and the ecological relationship between these genes in the rhizosphere sediment of a freshwater lake in summer. Materials and methods: Sediment from the rhizosphere of four submerged macrophytes (Ceratophyllum demersum, Hydrilla verticillata, Potamogeton maackianus, and Vallisneria spiralis) was sampled in Lake Liangzi, China, in summer. The anammox bacteria ...
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    Purpose: Submerged plants make an important contribution to nitrogen cycling in lakes including in the rhizosphere microenvironment through microbial activities. The main objective of this study was to investigate the abundance of functional genes for nitrogen cycling and the ecological relationship between these genes in the rhizosphere sediment of a freshwater lake in summer. Materials and methods: Sediment from the rhizosphere of four submerged macrophytes (Ceratophyllum demersum, Hydrilla verticillata, Potamogeton maackianus, and Vallisneria spiralis) was sampled in Lake Liangzi, China, in summer. The anammox bacteria community structure and abundance of five functional genes for nitrogen cycling, ammonia monooxygenase (amoA) of ammonia-oxidizing bacteria (AOB) and ammonia-oxidizing archaea (AOA), anammox 16S rRNA, and nitrite reductase genes (nirK and nirS) in the sampled sediment, were determined. Results and discussion: A total of 100 anammox gene sequences were grouped into eight operational taxonomic units (OTUs) and genus Ca. Kuenenia was the dominant species in Lake Liangzi in summer. Quantitative polymerase chain reaction (qPCR) revealed that gene copies of AOA amoA (2.42 × 10 6 copies g −1 ) were more than one order of magnitude higher than those of AOB amoA (1.98 × 10 5 copies g −1 ). The nirS gene (4.13 × 10 8 copies g −1 ) was more abundant than the nirK gene (7.28 × 10 7 copies g −1 ). There was no significant difference in the abundance of the AOB amoA gene among the rhizosphere of the four macrophytes. Redundancy analysis (RDA) showed a positive correlation between the abundance of the anammox 16S rRNA gene, AOA amoA and AOB amoA, which suggested two of these microbes may have provided a substrate for anammox bacteria in summer. Conclusions: The diversity of anammox in the rhizosphere of submerged macrophytes of the freshwater lake in summer was very low, but the plant species could affect the abundance of most nitrogen circulating bacteria, especially for anammox bacteria. Anammox 16S rRNA gene was positively correlated with four other functional genes, indicating that all four genes had significant effects on anammox bacteria.
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    Journal Title
    Journal of Soils and Sediments
    DOI
    https://doi.org/10.1007/s11368-019-02340-4
    Note
    This publication has been entered into Griffith Research Online as an Advanced Online Version.
    Subject
    Earth sciences
    Environmental sciences
    Agricultural, veterinary and food sciences
    Publication URI
    http://hdl.handle.net/10072/386011
    Collection
    • Journal articles

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