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Microbial functional genes reveal selection of microbial community by PAHs in polluted soils
Authors:Zhenyi Zhang  Xuan Zhao  Yuting Liang  Guanghe Li  Jizhong Zhou
Institution:1. Division of Environmental Technology, INET, Tsinghua University, Beijing, 100084, People’s Republic of China
2. Department of Environmental Science, Changzhou University, Jiangsu, 213164, People’s Republic of China
3. Department of Environmental Science and Engineering, Tsinghua University, Beijing, 100084, People’s Republic of China
4. Institute of Environmental Genomics, University of Oklahoma, Norman, OK, 73019, USA
Abstract:This report shows an increase of PAH-related microbial functional genes with PAH concentration in soils. Adaptation of microbial communities to organic pollutants such as polycyclic aromatic hydrocarbons (PAHs) is a crucial issue. However, there is little knowledge on mechanisms ruling microbial community selection. Here, we studied microbial functional genes in soils contaminated by PAHs. We used GeoChip, an advanced functional gene array for gene analysis. Soil PAH concentrations were measured and microbial functional genes were categorized. PAH-related microbial functional genes, bph, nah, nidA, phd, dfb, and qor, were quantitatively expressed. Total microbial functional genes and PAH-related microbial functional genes were compared with PAH concentration by cluster analysis and curve-fitting analysis. We found that the average abundance of PAH-related microbial functional genes increased from 0.13 to 0.33, whereas that of total microbial functional genes decreased from 0.22 to 0.10 when PAHs concentration increased from 1.01 to 164.28 mg kg?1. It was also found that the classification of microbial community structure characteristics based on PAH-related microbial functional genes was closely similar to the classification based on PAHs concentration. Findings reveal that PAH stress promotes the dominance of PAH-related microbial communities.
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