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首页> 美国卫生研究院文献>The ISME Journal >Novel microbial assemblages inhabiting crustal fluids within mid-ocean ridge flank subsurface basalt
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Novel microbial assemblages inhabiting crustal fluids within mid-ocean ridge flank subsurface basalt

机译：居住在中海脊侧面地下玄武岩中的地壳流体中的新型微生物组合

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Although little is known regarding microbial life within our planet's rock-hosted deep subseafloor biosphere, boreholes drilled through deep ocean sediment and into the underlying basaltic crust provide invaluable windows of access that have been used previously to document the presence of microorganisms within fluids percolating through the deep ocean crust. In this study, the analysis of 1.7 million small subunit ribosomal RNA genes amplified and sequenced from marine sediment, bottom seawater and basalt-hosted deep subseafloor fluids that span multiple years and locations on the Juan de Fuca Ridge flank was used to quantitatively delineate a subseafloor microbiome comprised of distinct bacteria and archaea. Hot, anoxic crustal fluids tapped by newly installed seafloor sampling observatories at boreholes U1362A and U1362B contained abundant bacterial lineages of phylogenetically unique Nitrospirae, Aminicenantes, Calescamantes and Chloroflexi. Although less abundant, the domain Archaea was dominated by unique, uncultivated lineages of marine benthic group E, the Terrestrial Hot Spring Crenarchaeotic Group, the Bathyarchaeota and relatives of cultivated, sulfate-reducing Archaeoglobi. Consistent with recent geochemical measurements and bioenergetic predictions, the potential importance of methane cycling and sulfate reduction were imprinted within the basalt-hosted deep subseafloor crustal fluid microbial community. This unique window of access to the deep ocean subsurface basement reveals a microbial landscape that exhibits previously undetected spatial heterogeneity.
机译：尽管对地球深层海底生物圈中微生物的生命知之甚少，但通过深海沉积物钻入底层玄武岩地壳中的钻孔提供了宝贵的进入窗口，这些窗口以前曾被用来记录渗入海水的流体中微生物的存在。深海地壳。在这项研究中，分析了从胡安德富卡岭侧面多年的海底沉积物，底部海水和玄武岩托管的深层海底液中扩增并测序的170万个小亚基核糖体RNA基因，并对其进行了测序，以定量描述海底液微生物组由不同的细菌和古细菌组成。 U1362A和U1362B钻孔中新安装的海底采样观测站挖掘的高温缺氧地壳液中含有丰富的系统发育上独特的硝化螺菌，细翅目、,翅目和弯弯曲藻的细菌谱系。尽管古菌域数量较少，但主要由海底底栖生物群E，陆地温泉文物古生物群，水生古生物群和栽培的，减少硫酸盐的古生球菌的亲属的独特，未培养的世系所支配。与最近的地球化学测量和生物能预测一致，甲烷循环和硫酸盐还原的潜在重要性被印在玄武岩宿主的深层海底地壳流体微生物群落中。通往深海地下室的独特窗口揭示了微生物景观，该景观展现出以前未发现的空间异质性。

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