Ecological selection of bacterial taxa with larger genome sizes in response to polycyclic aromatic hydrocarbons stress
Ecological selection of bacterial taxa with larger genome sizes in response to polycyclic aromatic hydrocarbons stress
复制标题
具有较大基因组大小的细菌类群响应多环芳烃胁迫的生态选择
DOI：
10.1016/j.jes.2021.04.027
复制
发表时间：
2022-02-01
影响因子：
6.9
通讯作者：
Zhuang, Xuliang
中科院分区：
文献类型：
--
作者：
Dong, Yuzhu;Wu, Shanghua;Zhuang, Xuliang
多环芳烃（PAHs）是一种普遍存在的优先污染物，对自然环境和人体健康造成巨大危害。群落中的平均基因组大小对于揭示微生物组对环境中污染压力的功能反应至关重要。在这里，不同浓度下的微宇宙进行评估的选择多环芳烃胁迫的平均基因组大小在一个社区。随着土壤中多环芳烃浓度梯度的增加，不同纬度土壤中多环芳烃的基因组大小明显增大，且变化趋势一致。基因组相对较大的变形菌和异常球菌-栖热菌的丰度沿着增加，对污染环境有较好的适应性。相比之下，具有高度流线型和较小基因组的Patescibacteria的丰度下降，这意味着环境选择和功能适应性之间的复杂相互作用导致具有较大基因组的细菌变得更加丰富。此外，我们证实了社区之间的降解基因的水平转移的能力增加，显示出增加的连接数每节点的nidA基因沿着的浓度梯度的共生网络。我们的研究结果表明，多环芳烃倾向于选择具有较大基因组大小的细菌类群，对群落稳定性和潜在的生物降解策略具有重大影响。(c)2021中国科学院生态环境科学研究中心由爱思唯尔公司出版
Polycyclic aromatic hydrocarbons (PAHs) are ubiquitous priority pollutants that cause great damage to the natural environment and health. Average genome size in a community is critical for shedding light on microbiome's functional response to pollution stress within an environment. Here, microcosms under different concentrations were performed to evaluate the selection of PAHs stress on the average genome size in a community. We found the distinct communities of significantly larger genome size with the increase of PAHs concentration gradients in soils, and consistent trends were discovered in soils at different latitudes. The abundance of Proteobacteria and Deinococcus-Thermus with relatively larger genomes increased along with PAHs stress and well adapted to polluted environments. In contrast, the abundance of Patescibacteria with a highly streamlined and smaller genome decreased, implying complex interactions between environmental selection and functional fitness resulted in bacteria with larger genomes becoming more abundant. Moreover, we confirmed the increased capacity for horizontal transfer of degrading genes between communities by showing an increased connection number per node positively related to the nidA gene along the concentration gradients in the co-occurrence network. Our findings suggest PAHs tend to select bacterial taxa with larger genome sizes, with significant consequences for community stability and potential biodegradation strategies. (c) 2021 The Research Center for Eco-Environmental Sciences, Chinese Academy of Sciences. Published by Elsevier B.V.