Dynamics of phosphorus and bacterial phoX genes during the decomposition of Microcystis blooms in a mesocosm.
Cyanobacterial blooms are a worldwide environmental problem and frequently occur in eutrophic lakes. Organophosphorus mineralization regulated by microbial alkaline phosphatase provides available nutrients for bloom regeneration. To uncover the dynamics of bacterial alkaline phosphatase activity and...
| Main Authors: | , , , , , , , , , , |
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| Format: | Article |
| Language: | English |
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Public Library of Science (PLoS)
2018-01-01
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| Series: | PLoS ONE |
| Online Access: | http://europepmc.org/articles/PMC5933731?pdf=render |
| _version_ | 1819050914567159808 |
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| author | Jiangyu Dai Dan Chen Shiqiang Wu Xiufeng Wu Guang Gao Xiangming Tang Keqiang Shao Xueyan Lv Wanyun Xue Qianqian Yang Senlin Zhu |
| author_facet | Jiangyu Dai Dan Chen Shiqiang Wu Xiufeng Wu Guang Gao Xiangming Tang Keqiang Shao Xueyan Lv Wanyun Xue Qianqian Yang Senlin Zhu |
| author_sort | Jiangyu Dai |
| collection | DOAJ |
| description | Cyanobacterial blooms are a worldwide environmental problem and frequently occur in eutrophic lakes. Organophosphorus mineralization regulated by microbial alkaline phosphatase provides available nutrients for bloom regeneration. To uncover the dynamics of bacterial alkaline phosphatase activity and microbial backgrounds in relation to organophosphorus mineralization during the decomposition process of cyanobacterial blooms, the response of alkaline phosphatase PhoX-producing bacteria were explored using a 23-day mesocosm experiment with three varying densities of Microcystis biomass from eutrophic Lake Taihu. Our study found large amounts of soluble reactive phosphorus and dissolved organophosphorus were released into the lake water during the decomposition process. Bacterial alkaline phosphatase activity showed the peak values during days 5~7 in groups with different chlorophyll-a densities, and then all decreased dramatically to their initial experimental levels during the last stage of decomposition. Bacterial phoX abundances in the three experimental groups increased significantly along with the decomposition process, positively related to the dissolved organic carbon and organophosphorus released by the Microcystis blooms. The genotypes similar to the phoX genes of Alphaproteobacteria were dominant in all groups, whereas the genotypes most similar to the phoX genes of Betaproteobacteria and Cyanobacteria were also abundant in the low density (~15 μg L-1 chlorophyll-a) group. At the end of the decomposition process, the number of genotypes most similar to the phoX of Betaproteobacteria and Cyanobacteria increased in the medium (~150 μg L-1 chlorophyll-a) and high (~1500 μg L-1 chlorophyll-a) density groups. The released organophosphorus and increased bacterial phoX abundance after decomposition of Microcystis aggregates could potentially provide sufficient nutrients and biological conditions for algal proliferation and are probably related to the regeneration of Microcystis blooms in eutrophic lakes. |
| first_indexed | 2024-12-21T11:55:37Z |
| format | Article |
| id | doaj.art-b17ebc06baac457d9b711147cc5a9514 |
| institution | Directory Open Access Journal |
| issn | 1932-6203 |
| language | English |
| last_indexed | 2024-12-21T11:55:37Z |
| publishDate | 2018-01-01 |
| publisher | Public Library of Science (PLoS) |
| record_format | Article |
| series | PLoS ONE |
| spelling | doaj.art-b17ebc06baac457d9b711147cc5a95142022-12-21T19:04:57ZengPublic Library of Science (PLoS)PLoS ONE1932-62032018-01-01135e019520510.1371/journal.pone.0195205Dynamics of phosphorus and bacterial phoX genes during the decomposition of Microcystis blooms in a mesocosm.Jiangyu DaiDan ChenShiqiang WuXiufeng WuGuang GaoXiangming TangKeqiang ShaoXueyan LvWanyun XueQianqian YangSenlin ZhuCyanobacterial blooms are a worldwide environmental problem and frequently occur in eutrophic lakes. Organophosphorus mineralization regulated by microbial alkaline phosphatase provides available nutrients for bloom regeneration. To uncover the dynamics of bacterial alkaline phosphatase activity and microbial backgrounds in relation to organophosphorus mineralization during the decomposition process of cyanobacterial blooms, the response of alkaline phosphatase PhoX-producing bacteria were explored using a 23-day mesocosm experiment with three varying densities of Microcystis biomass from eutrophic Lake Taihu. Our study found large amounts of soluble reactive phosphorus and dissolved organophosphorus were released into the lake water during the decomposition process. Bacterial alkaline phosphatase activity showed the peak values during days 5~7 in groups with different chlorophyll-a densities, and then all decreased dramatically to their initial experimental levels during the last stage of decomposition. Bacterial phoX abundances in the three experimental groups increased significantly along with the decomposition process, positively related to the dissolved organic carbon and organophosphorus released by the Microcystis blooms. The genotypes similar to the phoX genes of Alphaproteobacteria were dominant in all groups, whereas the genotypes most similar to the phoX genes of Betaproteobacteria and Cyanobacteria were also abundant in the low density (~15 μg L-1 chlorophyll-a) group. At the end of the decomposition process, the number of genotypes most similar to the phoX of Betaproteobacteria and Cyanobacteria increased in the medium (~150 μg L-1 chlorophyll-a) and high (~1500 μg L-1 chlorophyll-a) density groups. The released organophosphorus and increased bacterial phoX abundance after decomposition of Microcystis aggregates could potentially provide sufficient nutrients and biological conditions for algal proliferation and are probably related to the regeneration of Microcystis blooms in eutrophic lakes.http://europepmc.org/articles/PMC5933731?pdf=render |
| spellingShingle | Jiangyu Dai Dan Chen Shiqiang Wu Xiufeng Wu Guang Gao Xiangming Tang Keqiang Shao Xueyan Lv Wanyun Xue Qianqian Yang Senlin Zhu Dynamics of phosphorus and bacterial phoX genes during the decomposition of Microcystis blooms in a mesocosm. PLoS ONE |
| title | Dynamics of phosphorus and bacterial phoX genes during the decomposition of Microcystis blooms in a mesocosm. |
| title_full | Dynamics of phosphorus and bacterial phoX genes during the decomposition of Microcystis blooms in a mesocosm. |
| title_fullStr | Dynamics of phosphorus and bacterial phoX genes during the decomposition of Microcystis blooms in a mesocosm. |
| title_full_unstemmed | Dynamics of phosphorus and bacterial phoX genes during the decomposition of Microcystis blooms in a mesocosm. |
| title_short | Dynamics of phosphorus and bacterial phoX genes during the decomposition of Microcystis blooms in a mesocosm. |
| title_sort | dynamics of phosphorus and bacterial phox genes during the decomposition of microcystis blooms in a mesocosm |
| url | http://europepmc.org/articles/PMC5933731?pdf=render |
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