Interactions between bacteria and phytoplankton in microbial communities under cadmium contamination conditions

Abstract:

[Background] Microorganisms in water are rich in diversity, and various interspecific relationships occur among different microorganisms, which have an important influence on the composition structure and function of water ecosystem. Phytoplankton (microalgae and cyanobacteria) and some microbes in aquatic environment can interact with each other in various formats. However, the beneficial interactions between bacteria and phytoplankton under stress conditions remain unclear.[Objective] Studying the effects of Cd²⁺ on the microbial community of water samples and possible interactions between bacteria and phytoplankton.[Methods] Based on the high throughput sequencing of 16S rRNA gene, we analyzed the changes of microbial community structure under Cd²⁺ stress. We used the microbial interaction network to analyze the possible interaction between bacteria and phytoplankton.[Results] By isolation and culture, we found that the strain Y9 could interact with Synechocystis sp. PCC6803 and help the algae to resist the toxicity of Cd²⁺. [Conclusion] The results showed that strain Y9 belonged to Phyllobacteriaceae family, which was consistent with the results of microbial community composition and microbial interaction network. This study will provide a new scientific basis for exploring the interactions between microorganisms in aquatic environment and the ecological effects of interactions between bacteria and phytoplankton for cadmium resistance.

Key words:bacteria and phytoplankton interaction;Cd²⁺;microbial community;microbial interaction network