Ecological selection of bacterial taxa with larger genome sizes in response to polycyclic aromatic hydrocarbons stress

作     者：Yuzhu Dong Shanghua Wu Haonan Fan Xianglong Li Yijing Li Shengjun Xu Zhihui Bai Xuliang Zhuang Yuzhu Dong;Shanghua Wu;Haonan Fan;Xianglong Li;Yijing Li;Shengjun Xu;Zhihui Bai;Xuliang Zhuang

作者机构：Key Laboratory of Environmental BiotechnologyResearch Center for Eco-Environmental SciencesChinese Academy of SciencesBeijing 100085China College of Resources and EnvironmentUniversity of Chinese Academy of SciencesBeijing 200049China College of Sino-Danish CenterUniversity of Chinese Academy of SciencesBeijing 100049China 

出 版 物：《Journal of Environmental Sciences》 (环境科学学报（英文版）)

年 卷 期：2022年第34卷第2期

页      面：82-93页

核心收录：

学科分类：0830[工学-环境科学与工程（可授工学、理学、农学学位）] 082803[工学-农业生物环境与能源工程] 08[工学] 0828[工学-农业工程] 

基　　金：supported by the National Natural Science Foundation of China(No.31670507) National Key R&D Program of China(No.2019YFC1805803) the National Natural Science Foundation of China(Nos.41907273 and 91951108) the Strategic Priority Research Program of Chinese Academy of Sciences(No.XDA23010400)。 

主　　题：Pollution stress Polycyclic aromatic hydrocarbons(PAHs) Genome size Horizontal gene transfer Soil microbial community 

摘      要：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 nid A 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.