Rapid metabolism fosters microbial survival in the deep, hot subseafloor biosphere.
Rapid metabolism fosters microbial survival in the deep, hot subseafloor biosphere.
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DOI：
10.1038/s41467-021-27802-7
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发表时间：
2022-01-25
影响因子：
16.6
通讯作者：
Treude T
中科院分区：
文献类型：
--
作者：
Beulig F;Schubert F;Adhikari RR;Glombitza C;Heuer VB;Hinrichs KU;Homola KL;Inagaki F;Jørgensen BB;Kallmeyer J;Krause SJE;Morono Y;Sauvage J;Spivack AJ;Treude T
全球四分之一的海底沉积物埋藏在温度超过80 °C的深度，这是以前提出的地下生命的热屏障。在这里，我们证明，利用一套广泛的放射性示踪剂实验，活跃的产甲烷和硫酸盐还原人口的普遍性深埋海洋沉积物从南海海槽俯冲带，加热到极端温度（高达~120 °C）。小型微生物群落以高的潜在细胞特异性能量代谢速率生存，接近活性表层沉积物和实验室培养物的速率。我们的发现与在深海海底观察到的极低代谢率形成鲜明对比。由于细胞似乎投入了大部分能量来修复热沉积物中的热细胞损伤，它们被迫在接近生命上限的温度和丰富的基质供应之间保持微妙的平衡，并从沉积有机物的热驱动反应中获得能量。在深层沉积生物圈中，80 °C被认为是生命的最高热屏障。利用一系列放射性示踪实验，本研究报告了南海海槽俯冲带深埋海洋沉积物中具有高细胞特异性代谢率的活性产甲烷和硫酸盐还原微生物种群，其温度高达120 °C。
A fourth of the global seabed sediment volume is buried at depths where temperatures exceed 80 °C, a previously proposed thermal barrier for life in the subsurface. Here, we demonstrate, utilizing an extensive suite of radiotracer experiments, the prevalence of active methanogenic and sulfate-reducing populations in deeply buried marine sediment from the Nankai Trough subduction zone, heated to extreme temperature (up to ~120 °C). The small microbial community subsisted with high potential cell-specific rates of energy metabolism, which approach the rates of active surface sediments and laboratory cultures. Our discovery is in stark contrast to the extremely low metabolic rates otherwise observed in the deep subseafloor. As cells appear to invest most of their energy to repair thermal cell damage in the hot sediment, they are forced to balance delicately between subsistence near the upper temperature limit for life and a rich supply of substrates and energy from thermally driven reactions of the sedimentary organic matter. In the deep sedimentary biosphere, 80 °C has been proposed as an upper thermal barrier for life. Using a suite of radiotracer experiments, this study reports active methanogenic and sulfate-reducing microbial populations with high cell-specific metabolic rates in deeply buried marine sediments from the Nankai Trough subduction zone, which reach temperatures up to 120 °C.
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影响因子：
3.7
作者：
Bradley JA;Amend JP;LaRowe DE
通讯作者：
LaRowe DE
DOI：
10.1073/pnas.0600035103
发表时间：
2006-03-07
影响因子：
11.1
作者：
Biddle, JF;Lipp, JS;Hinrichs, KU
通讯作者：
Hinrichs, KU
影响因子：
2.9
作者：
HELGESON, HC
通讯作者：
HELGESON, HC
影响因子：
4.4
作者：
Detmers, J;Br端chert, V;Kuever, J
通讯作者：
Kuever, J
影响因子：
5
作者：
Heuer, Verena B.;Pohlman, John W.;Hinrichs, Kai-Uwe
通讯作者：
Hinrichs, Kai-Uwe