Taxonomic, Phylogenomic and Bioactivity Profiling of Novel Phycosphere Bacterium from Model Cyanobacterium Synechococcus elongatus PCC 7942

文献类型： 外文期刊

第一作者： Zhang, Xiaoling

作者： Zhang, Xiaoling;Xu, Jiaquan;Zhang, Xiaoling;Dai, Jun;Zhang, Xiaoling;Yang, Qiao;Xu, Jiaquan;Zhang, Lei;Feng, Lijuan;Yang, Qiao;Xu, Jiaquan;Yang, Qiao;Tian, Xiaoqing;Yang, Qiao

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关键词： phycosphere microbiota; algae-bacteria interactions; marine model cyanobacterium; bioactive exopolysaccharides; microalgae growth-promoting bacterium; CO2 fixation efficiency by microalgae; Synechococcus elongatus PCC 7942

期刊名称：MARINE DRUGS （ 影响因子：5.4； 五年影响因子：5.5 ）

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年卷期： 2024 年 22 卷 1 期

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收录情况： SCI

摘要： Phycosphere niches host rich microbial consortia that harbor dynamic algae-bacteria interactions with fundamental significance in varied natural ecosystems. Hence, culturing the uncultured microbial majority of the phycosphere microbiota is vital for deep understanding of the intricate mechanisms governing the dynamic interactions, and also to provide novel and rich microbial resources, and to discover new natural bioactive metabolites. Synechococcus elongatus PCC 7942 is a robust model cyanobacterium widely used in environment, synthesis biology, and biotechnology research. To expand the number of novel phycosphere species that were brought into culture and to discover the natural bioactivities, we presented a new yellow-pigmented bacterium named ABI-127-1, which was recovered from the phycosphere of PCC 7942, using an optimized bacterial isolation procedure. Combined polyphasic taxonomic and phylogenomic characterization was performed to confidently identify the new isolate as a potential novel species belonging to the genus Qipengyuania. The observed bioactivity of strain ABI-127-1 with promoting potential towards the growth and CO2 fixation efficiency of the host microalgae was measured. Additionally, the bacterial production of active bioflocculant exopolysaccharides was evaluated after culture optimization. Thus, these findings revealed the potential environmental and biotechnological implications of this new microalgae growth-promoting bacterium isolated from the phycosphere microenvironment.

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