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| DOI | 10.1073/pnas.2112355118 |
| Discovery of nondiazotrophic Trichodesmium species abundant and widespread in the open ocean | |
| Delmont T.O. | |
| 发表日期 | 2021 |
| ISSN | 0027-8424 |
| 卷号 | 118期号:46 |
| 英文摘要 | Filamentous and colony-forming cells within the cyanobacterial genus Trichodesmium might account for nearly half of nitrogen fixation in the sunlit ocean, a critical mechanism that sustains plankton's primary productivity. Trichodesmium has long been portrayed as a diazotrophic genus. By means of genome-resolved metagenomics, here we reveal that nondiazotrophic Trichodesmium species not only exist but also are abundant and widespread in the open ocean, benefiting from a previously overlooked functional lifestyle to expand the biogeography of this prominent marine genus. Near-complete environmental genomes for those closely related candidate species reproducibly shared functional features including a lack of genes related to nitrogen fixation, hydrogen recycling, and hopanoid lipid production concomitant with the enrichment of nitrogen assimilation genes. Our results elucidate fieldwork observations of Trichodesmium cells fixing carbon but not nitrogen. The Black Queen hypothesis and burden of low-oxygen concentration requirements provide a rationale to explain gene loss linked to nitrogen fixation among Trichodesmium species. Disconnecting taxonomic signal for this genus from a microbial community's ability to fix nitrogen will help refine our understanding of the marine nitrogen balance. Finally, we are reminded that established links between taxonomic lineages and functional traits do not always hold true. © 2021 National Academy of Sciences. All rights reserved. |
| 英文关键词 | Ecology and evolution; Metagenomics; Nitrogen fixation; Tara Oceans; Trichodesmium |
| 语种 | 英语 |
| scopus关键词 | hydrogen; lipid; carbon; nitrogen; sea water; Article; bacterial cell; bacterial gene; bacterial genome; metagenomics; nitrogen fixation; nonhuman; open sea; phylogeny; population abundance; sequence analysis; Trichodesmium; cyanobacterium; genetics; genome; metabolism; microbiology; physiology; procedures; sea; Trichodesmium; Carbon; Cyanobacteria; Genome; Metagenomics; Nitrogen; Nitrogen Fixation; Oceans and Seas; Seawater; Trichodesmium |
| 来源期刊 | Proceedings of the National Academy of Sciences of the United States of America
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| 文献类型 | 期刊论文 |
| 条目标识符 | http://gcip.llas.ac.cn/handle/2XKMVOVA/250987 |
| 作者单位 | GenomiqueMetabolique, Genoscope, Institut François Jacob, Commissariat a l'Energie Atomique et aux Energies Alternatives, CNRS, Universite Paris-Saclay, Evry, 91057, France; CNRS Research Federation for the study of Global Ocean Systems Ecology and Evolution, Federation de recherche 2022/Tara Oceans, Paris, 75016, France |
| 推荐引用方式 GB/T 7714 | Delmont T.O.. Discovery of nondiazotrophic Trichodesmium species abundant and widespread in the open ocean[J],2021,118(46). |
| APA | Delmont T.O..(2021).Discovery of nondiazotrophic Trichodesmium species abundant and widespread in the open ocean.Proceedings of the National Academy of Sciences of the United States of America,118(46). |
| MLA | Delmont T.O.."Discovery of nondiazotrophic Trichodesmium species abundant and widespread in the open ocean".Proceedings of the National Academy of Sciences of the United States of America 118.46(2021). |
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