Cable bacteria associated with long-distance electron transport in New England salt marsh sediment
Cable bacteria associated with long-distance electron transport in New England salt marsh sediment
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DOI：
10.1111/1758-2229.12216
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发表时间：
2015-04-01
影响因子：
3.3
通讯作者：
Schramm, Andreas
中科院分区：
文献类型：
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作者：
Larsen, Steffen;Nielsen, Lars Peter;Schramm, Andreas
丝状菌Desulfobulbaceae被认为是电缆细菌，它电耦合海洋沉积物中的硫化物氧化和氧还原，从而产生一个厘米深的亚氧带。我们孵育新英格兰盐沼沉积物，并发现长距离电子传输6毫米和16 S rRNA基因相同，以前观察到的电缆细菌在奥胡斯湾沉积物孵育。应用荧光原位杂交技术对沉积物柱状样中电缆细菌密度进行了定量分析。相反，沿海，潮下带沉积物的电缆细菌的基础上迅速枯竭的硫化铁池短期水华，盐沼电缆社区的基础上进行硫酸盐还原，因此可能更持久。以前观察到的季节性Desulfobulbaceae优势和广泛的减少硫氧化盐沼之间的相关性表明，电缆细菌有时可能有一个重要的作用，在原地。
Filamentous Desulfobulbaceae have been proposed as cable bacteria', which electrically couple sulfide oxidation and oxygen reduction in marine sediment and thereby create a centimetre-deep suboxic zone. We incubated New England salt marsh sediment and found long-distance electron transport across 6mm and 16S rRNA genes identical to those of previously observed cable bacteria in Aarhus Bay sediment incubations. Cable bacteria density in sediment cores was quantified by fluorescence in situ hybridization. In contrast to the coastal, subtidal sediments with short-termed blooms of cable bacteria based on rapidly depleted iron sulfide pools, the salt marsh cable community was based on ongoing sulfate reduction and therefore probably more persistent. Previously observed seasonal correlation between Desulfobulbaceae dominance and extensive reduced sulfur oxidation in salt marshes suggest that cable bacteria at times may have an important role in situ.