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 eval-uate 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 con-centration gradients in soils,and consistent trends were discovered in soils at different lat-itudes.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 com-munities 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.

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

Key Laboratory of Environmental Biotechnology,Research Center for Eco-Environmental Sciences,Chinese Academy of Sciences,Beijing 100085,China;College of Resources and Environment,University of Chinese Academy of Sciences,Beijing 100049,China;College of Sino-Danish Center,University of Chinese Academy of Sciences,Beijing 100049,China

环境科学学报（英文版）

[1]Yuzhu Dong;Shanghua Wu;Haonan Fan;Xianglong Li;Yijing Li;Shengjun Xu;Zhihui Bai;Xuliang Zhuang-.Ecological selection of bacterial taxa with larger genome sizes in response to polycyclic aromatic hydrocarbons stress)[J].环境科学学报（英文版）,2022(02):82-93

microcosms,itudes,nidA

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