4.7 Article

The distinct response of phenanthrene enriched bacterial consortia to different PAHs and their degradation potential: a mangrove sediment microcosm study

期刊

JOURNAL OF HAZARDOUS MATERIALS
卷 380, 期 -, 页码 -

出版社

ELSEVIER
DOI: 10.1016/j.jhazmat.2019.120863

关键词

Phenanthrene enrichment; Bacterial community composition; High molecular weight PAHs; PAH-RHD alpha genes; Degradation

资金

  1. Strategic Priority Research Program of the Chinese Academy of Sciences [XDA13020300]
  2. National Natural Science Foundation of China [41676163, 41676107, 41276114, 41406191]
  3. National Key Research and Development Program of China [2017YFC0506301, 2018YFC1406505, 2018FY100105, 2016YFC1403003]
  4. Guangdong Province Public Welfare Research and Capacity Building Project [2015A020216016]
  5. Pearl River S&T Nova Program of Guangzhou [201806010017]
  6. Science and Technology Planning Project of Guangdong Province, China [2017B030314052]

向作者/读者索取更多资源

Understanding the microbial community succession to polycyclic aromatic hydrocarbons (PAHs) and identification of important degrading microbial groups are crucial for the designing of appropriate bioremediation strategies. In the present study, two distinct phenanthrene enriched bacterial consortia were treated against high molecular weight (Pyrene, Benzo (a) pyrene and Benzo (a) fluoranthene) and the response was studied in term of taxonomic variations by using High Throughput Illumine sequencing and qPCR analysis. Overall, the type of PAHs significantly affected the composition and the relative abundance of bacterial communities while no obvious difference was detected between bacterial communities of benzo (a) pyrene and benzo (a) fluoranthene treatments. Genera, Novosphingobiwn, Pseudomonas, Flavobacterium, Mycobacterium, Hoefiae, and Algoriphagus dominated all PAHs treatment groups indicating that they could be the key PAHs degrading phylotypes. Due to the higher abundance of gram-negative PAH-ring hydroxylating dioxygenase gene than that of gram-positive bacteria in all treated groups, we speculated that gram-negative bacteria may contribute more in the PAH degradation. The studied sediments harbored rich PAHs degrading bacterial assemblages involved in both low and high molecular weight PAHs and these findings provided new insight into the perspective of microbial PAHs bioremediation in the mangrove ecosystem.

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