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Article Dans Une Revue Acta Oceanologica Sinica Année : 2017

Characterization of uncultivated magnetotactic bacteria from the sediments of Yuehu Lake, China

Du Haijian
  • Fonction : Auteur
Zhang Rui
  • Fonction : Auteur
Zhang Wenyan
  • Fonction : Auteur
Xu Cong
  • Fonction : Auteur
Chen Yiran
  • Fonction : Auteur
Pan Hongmiao
  • Fonction : Auteur
Zhou Ke
  • Fonction : Auteur
Wu Long-Fei

Résumé

Marine magnetotactic bacteria were collected from the intertidal sediments of Yuehu Lake (China), where their abundance reached 10(3)-10(4) ind./cm(3). Diverse morphotypes of magnetotactic bacteria were observed, including cocci and oval, vibrio-, spirillum-, rod-, elliptical-, handle- and bar-shaped forms. The magnetococci were the most abundant, and had flagella arranged in parallel within a bundle. The majority of magnetosomes were arranged in one, two or multiple chains, although irregular arrangements were also evident. All the results of high-resolution transmission electron microscopy (HRTEM) analysis show that magnetosome crystals were composed of Fe3O4, and their morphology was specific to particular cell morphotypes. By the 16S rRNA gene sequence analysis, we found fourteen operational taxonomic units (OTUs) which were related to magnetotactic bacteria. Among these, thirteen belonged to the Alphaproteobacteria and one to the Gammaproteobacteria. Compared with known axenic and uncultured marine magnetotactic bacteria, the 16S rRNA gene sequences of most magnetotactic bacteria collected from the Yuehu Lake exhibited sequence identities ranging from 90.1% to 96.2% (\textless 97%). The results indicate that microbial communities containing previously unidentified magnetotactic bacteria occur in the Yuehu Lake.
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Dates et versions

hal-01640024 , version 1 (20-11-2017)

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Du Haijian, Zhang Rui, Zhang Wenyan, Xu Cong, Chen Yiran, et al.. Characterization of uncultivated magnetotactic bacteria from the sediments of Yuehu Lake, China. Acta Oceanologica Sinica, 2017, 36 (2), pp.94--104. ⟨10.1007/s13131-017-0980-8⟩. ⟨hal-01640024⟩

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