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Published on: January 7, 2019
Niallia circulans Q3 enhances microalgal growth in algae-bacteria symbiotic systems for aquaculture wastewater
Shenwei Cheng1, Yaoting Guan2, Junchao Gao3
1Shandong Key Laboratory of Coastal Zone Environmental Processes and Ecological Security, Yantai Institute of Coastal Zone Research, Chinese Academy of Sciences, Yantai 264003, China; University of Chinese Academy of Sciences, Beijing 100049, China.
Abstract:
Microalgae play an important role in microalgae-bacteria symbiotic systems (MABS), and their growth directly affects purification efficiency. This study investigated the mechanistic role of microalgae growth-promoting bacteria in MABS, focusing on the screened strain Niallia circulans Q3. Through whole-genome sequencing, microscopic characterization, and validation in actual aquaculture effluent, the facilitative effects of Q3 on microalgal proliferation and aquaculture water purification were systematically elucidated. Results indicated that Q3 mitigated oxidative stress via antioxidant defense, promoted microalgal growth through multi-pathway synthesis of phytohormones, and enhanced phosphorus bioavailability through a sugar metabolism-driven acidification-chelation-hydrolysis mechanism. The presence of prophage-encoded auxiliary metabolic genes might further expand the metabolic versatility and stress resilience of the host bacterium, thereby stabilizing the MABS structure. Application in real effluent treatment demonstrated that supplementation with Q3 restructured the inter-algal microbial community, optimized nitrogen and phosphorus metabolic pathways, and significantly increased microalgal biomass and nutrient removal efficiency. This work provides both a theoretical foundation and practical strategies for the development of efficient microalgal production and aquaculture wastewater purification systems.
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