Changes in nitrogen metabolism of phosphorus-starved bloom-forming cyanobacterium Microcystis aeruginosa: Implications for nutrient management

文献类型： 外文期刊

第一作者： Wei, Nian

作者： Wei, Nian;Chen, Aifa;Zhang, Shubing;Li, Jie;Guo, Xiaohe;Song, Lirong;Gan, Nanqin;Zheng, Lingling;Jia, Yunlu;Li, Jie;Li, Jie

作者机构：

关键词： Bloom control; Dual reduction; Nitrogen uptake; Phosphorus deficiency; Phosphorus reduction; RNA-seq

期刊名称：SCIENCE OF THE TOTAL ENVIRONMENT （ 影响因子：9.8； 五年影响因子：9.6 ）

ISSN： 0048-9697

年卷期： 2023 年 903 卷

页码：

收录情况： SCI

摘要： The surplus of nitrogen plays a key role in the maintenance of cyanobacterial bloom when phosphorus has already been limited. However, the interplay between high nitrogen and low phosphorus conditions is not fully understood. Nitrogen metabolism is critical for the metabolism of cyanobacteria. Transcriptomic analysis in the present study suggested that nitrogen metabolism and ribosome biogenesis were the two most significantly changed pathways in long-term phosphorus-starved bloom-forming cyanobacteria Microcystis aeruginosa FACHB905. Notably, the primary glutamine synthetase/glutamate synthase cycle, crucial for nitrogen metabolism, was significantly downregulated. Concurrently, nitrogen uptake showed a marked decrease due to reduced expression of nitrogen source transporters. The content of intracellular nitrogen reservoir phycocyanin also showed a drastic decrease upon phosphorus starvation. Our study demonstrated that long-term phosphorus-starved cells also suffered from nitrogen deficiency because of the reduction in nitrogen assimilation, which might be limited by the reduced ribosome biogenesis and the shortage of adenosine triphosphate. External nitrogen supply will not change the transcriptions of nitrogen metabolism-related genes significantly like that under phosphorus-rich conditions, but still help to maintain the survival of phosphorus-starved cells. The study deepens our under- standing about the survival strategies of Microcystis cells under phosphorus starvation and the mutual depen- dence between nitrogen and phosphorus, which would provide valuable information for nutrient management in the eutrophicated water body.

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