Impact of zinc oxide nanoparticles on the bacterial community of Hydra magnipapillata

[摘要] Backgrounds Zinc oxide nanoparticles (ZnO NPs) are extensively used for various products. In this study, the effects of ZnO NPs exposure in diversity and community composition of the bacteria associated with H. magnipapillata were investigated. This study provides insight into possible impacts of ZnO NPs on aquatic organisms. Methods 454-pyrosequencing analysis of the bacterial 16S rRNA gene was applied to H. magnipapillata after exposure to 10 mg/L ZnO NPs (Ø 20 nm). Results Acute exposure to ZnO NPs changed the diversity and compositions of the associated bacteria. The composition of Curvibacter decreased, but Flectobacillus and Delftia increased; these two genera are known to have beneficial functions. Conclusion The changes in diversity and composition of the associated bacteria may indicate the possible mechanisms by which the associated bacteria maintain their mutual interactions and support the health of their host after exposure to ZnO NPs.

[关键词] Hydra-associated bacteria;Nanomaterial;16S rRNA gene-based metagenomic;Bacterial composition