Journal
SCIENCE OF THE TOTAL ENVIRONMENT
Volume 660, Issue -, Pages 733-740Publisher
ELSEVIER
DOI: 10.1016/j.scitotenv.2019.01.052
Keywords
Agricultural soil; DEHP biodegradation; Microbial interaction; Stable isotope probing
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Funding
- National Natural Science Foundation of China [41807348, 41673111]
- Natural Science Foundation of Guangdong Province, China [2018A030313485]
- Scientific and Technological Planning Project of Guangzhou, China [201707020034]
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The indigenous microorganisms with the ability of metabolising di-(2-ethylhexyl) phthalate (DEHP) in agricultural soils and their interactions with non-degrading microbes were revealed by DNA-based stable isotope probing coupled with molecular ecological network. Aside from the previously reported DEHP degraders (family Planococcaceae and genus Sphingobacterium), five OTUs representing bacteria affiliated with genus Brevundimona, class Spartobacteria, genus Singulisphaera, genus Dyella and class Ktedonobacteria were linked with DEHP biodegradation. The analysis of the constructed ecological network based on soil microbial communities demonstrated the negative relationships between DEHP degraders and the dominant family Oxalobacteraceae in soils. Additionally, two cultivable bacteria isolated from the same soils, Rhizobium-1 and Ensifer-1, had strong capabilities in degrading DEHP but their involvement in in situ DEHP degradation was questioned, as their DNA was not labelled with C-13 from DEHP. These findings provide deeper understanding on the indigenous DEHP-degrading communities and will benefit the remediation of phthalate esters contaminated soils. (C) 2019 Elsevier B.V. All rights reserved.
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