Abstract
Several studies indicated that Odorrana grahami (O. grahami) skin contains abundant antimicrobial peptides, and the skin was recognized as hostile habitat for microorganisms. In this study, the microbial community was evaluated by 16S rRNA gene sequencing, and two associated bacterial isolates were obtained and characterized from the skin of O. grahami. Sixteen bacterial genera were identified from the O. grahami skin by uncultured clone sequences. The dominant groups were Comamonas, Bacillus and Morganella, and the genus Comamonas was the most abundant group (41.7% of the total) of the community. Fortunately, strains CW-25T and CW-518 belonging to genus Comamonas were isolated by plating dilutions. The polyphasic taxonomy results indicated that strain CW-25T was a member of Comamonas aquatica, it showed much higher antimicrobials resistance than the closest C. aquatica strains of LMG 2370T, LMG5937 and LMG 6112 isolated from freshwater. Based on the polyphasic taxonomic studies and antimicrobials resistance characteristics, two subspecies of Comamonas aquatica subsp. aquatica nov. and Comamonas aquatica subsp. rana nov. were proposed. The super-antimicrobial resistance endows the strains of Comamonas aquatica subsp. rana inhabit the O. grahami skin, and the primary defense of O. grahami might be composed by the antimicrobial peptides and the native bacteria.
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Acknowledgements
This work was supported by National Key R&D Program of China (Grant No. 2017YFC1600902), and the grants from the National Natural Science Foundation of China (Grant No. 31671949) and the Anhui Natural Science Foundation (Grant Nos. 1608085J08 and 1608085QC57).
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This study was carried out in strict accordance with the guidelines of the Animal Care Committee of Anhui Agricultural University (Reference No. SYXK 2016-011). The protocol was approved by the Committee on the Ethics of Anhui Agricultural University.
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Zhao, X., Du, Z., Chen, J. et al. Bacterial Community Analysis on the Skin of Odorrana grahami and Proposal of Comamonas aquatica subsp. aquatica subsp. nov. and Comamonas aquatica subsp. rana subsp. nov.. Curr Microbiol 76, 470–477 (2019). https://doi.org/10.1007/s00284-019-01648-1
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DOI: https://doi.org/10.1007/s00284-019-01648-1