期刊
NATURE MICROBIOLOGY
卷 3, 期 7, 页码 804-+出版社
NATURE PORTFOLIO
DOI: 10.1038/s41564-018-0176-9
关键词
-
类别
资金
- Frank R. Lillie Research Innovation Award
- start-up funds from the University of Chicago
- Netherlands Organization for Scientific Research grant [VENI 863.14.019]
- EPSRC Career Acceleration Fellowship [EP/H003851/1]
- MRC fellowship as part of the CLoud Infrastructure for Microbial Genomics (CLIMB) consortium [MR/M50161X/1, MR/L015080/1]
- BBSRC [BB/L027801/1, BB/R015171/1] Funding Source: UKRI
- MRC [MR/L015080/1] Funding Source: UKRI
- NERC [NE/M011674/1] Funding Source: UKRI
Nitrogen fixation in the surface ocean impacts global marine nitrogen bioavailability and thus microbial primary productivity. Until now, cyanobacterial populations have been viewed as the main suppliers of bioavailable nitrogen in this habitat. Although PCR amplicon surveys targeting the nitrogenase reductase gene have revealed the existence of diverse non-cyanobacterial diazotrophic populations, subsequent quantitative PCR surveys suggest that they generally occur in low abundance. Here, we use state-of-the-art metagenomic assembly and binning strategies to recover nearly one thousand non-redundant microbial population genomes from the TARA Oceans metagenomes. Among these, we provide the first genomic evidence for non-cyanobacterial diazotrophs inhabiting surface waters of the open ocean, which correspond to lineages within the Proteobacteria and, most strikingly, the Planctomycetes. Members of the latter phylum are prevalent in aquatic systems, but have never been linked to nitrogen fixation previously. Moreover, using genome-wide quantitative read recruitment, we demonstrate that the discovered diazotrophs were not only widespread but also remarkably abundant (up to 0.3% of metagenomic reads for a single population) in both the Pacific Ocean and the Atlantic Ocean northwest. Our results extend decades of PCR-based gene surveys, and substantiate the importance of heterotrophic bacteria in the fixation of nitrogen in the surface ocean.
作者
我是这篇论文的作者
点击您的名字以认领此论文并将其添加到您的个人资料中。
推荐
暂无数据