Water quality drives the distribution of freshwater cable bacteria
Water quality drives the distribution of freshwater cable bacteria
复制标题
水质驱动淡水电缆细菌的分布
DOI：
10.1016/j.scitotenv.2022.156468
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发表时间：
2022-10-01
影响因子：
9.8
通讯作者：
Sun, Guoping
中科院分区：
文献类型：
--
作者：
Dong, Meijun;Yang, Shan;Sun, Guoping
电缆细菌是近年来发现的一类能氧化硫化物的丝状脱硫菌，对地球化学循环具有重要影响。然而，对电缆细菌分布模式和驱动力的了解有限，阻碍了我们评估和最大限度地发挥它们对环境健康贡献的能力。我们评估了电缆细菌组合从十个河流沉积物中，中国珠江三角洲。结果显示，电缆细菌的生物地理分布格局清晰，它们的群落是通过水质驱动的选择确定性组装。河流沉积物中电缆菌种类繁多，通才少，专才多，Ⅳ、Ⅴ类水质环境是电缆菌的“热点”。“然后，我们提供了关于它们的形态、功能和基因组的证据，以证明水质如何塑造电缆细菌组合。在硫化物限制的水质III和污染物胁迫的水质VI环境中检测到细胞宽度减少，功能抑制和水质相关的适应性基因组特征。具体而言，这些基因组性状有助于在水质III环境中的碳和硫代谢和水质VI环境中的胁迫抗性。总的来说，这些发现为评估电缆细菌在淡水生态系统中的贡献提供了一个有用的基线，并表明它们在生殖、形态和基因组方面的高度多样性和灵活性使它们能够适应和促进各种环境条件。
Cable bacteria are a group of recently found filamentous sulfide-oxidizing Desulfobulbaceae that significantly impact biogeochemical cycling. However, the limited understanding of cable bacteria distribution patterns and the driving force hindered our abilities to evaluate and maximize their contribution to environmental health. We evaluated cable bacteria assemblages from ten river sediments in the Pearl River Delta, China. The results revealed a clear bio-geographic distribution pattern of cable bacteria, and their communities were deterministically assembled through water quality-driven selection. Cable bacteria are diverse in the river sediments with a few generalists and many spe-cialists, and the water quality IV and V environments are the "hot spot." We then provided evidence on their morphol-ogy, function, and genome to demonstrate how water quality might shape the cable bacteria assemblages. Reduced cell width, inhibited function, and water quality-related adaptive genomic traits were detected in sulfide-limited water quality III and contaminant-stressed water quality VI environments. Specifically, those genomic traits were contributed to carbon and sulfur metabolism in the water quality III environment and stress resistance in the water quality VI environment. Overall, these findings provided a helpful baseline in evaluating the contribution of cable bacteria in the freshwater ecosystem and suggested that their high diversity and flexibility in phylogeny, morphology, and genome allowed them to adapt and contribute to various environmental conditions.