Microbial dormancy in the marine subsurface: Global endospore abundance and response to burial
Microbial dormancy in the marine subsurface: Global endospore abundance and response to burial
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DOI：
10.1126/sciadv.aav1024
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发表时间：
2019-02-01
期刊：
影响因子：
13.6
通讯作者：
Hinrichs, Kai-Uwe
中科院分区：
文献类型：
--
作者：
Woermer, Lars;Hoshino, Tatsuhiko;Hinrichs, Kai-Uwe
海洋沉积物中有一个意想不到的大微生物生物圈，这表明了埋葬和缓慢代谢周转的独特微生物机制。虽然休眠通常被认为是一种重要的生存策略，但其在地下沉积物中的具体作用仍不清楚。我们量化休眠细菌内生孢子在331个海洋沉积物样品从不同的沉积类型和地理来源。内生孢子相对于营养细胞的丰度随着埋藏深度的增加而增加，内生孢子在25 m以下占主导地位，估计在沉积物的最上层公里中的内生孢子数量为2.5 x 10（28）至1.9 x 10（29），相应的生物量碳为4.6至35 Pg，超过了营养细胞。我们的数据进一步确定了不同的内生孢子亚群不同的埋葬和老化的阻力。内生孢子可以塑造深层生物圈，为新生境的定殖提供核心种群，和/或通过低频率萌发维持这种环境中的缓慢生长。
Marine sediments host an unexpectedly large microbial biosphere, suggesting unique microbial mechanisms for surviving burial and slow metabolic turnover. Although dormancy is generally considered an important survival strategy, its specific role in subsurface sediments remains unclear. We quantified dormant bacterial endospores in 331 marine sediment samples from diverse depositional types and geographical origins. The abundance of endospores relative to vegetative cells increased with burial depth and endospores became dominant below 25 m, with an estimated population of 2.5 x 10(28) to 1.9 x 10(29) endospores in the uppermost kilometer of sediment and a corresponding biomass carbon of 4.6 to 35 Pg surpassing that of vegetative cells. Our data further identify distinct endospore subgroups with divergent resistance to burial and aging. Endospores may shape the deep biosphere by providing a core population for colonization of new habitats and/or through low-frequency germination to sustain slow growth in this environment.