4.6 Article

The effect of electron donors on the dechlorination of pentachlorophenol (PCP) and prokaryotic diversity in paddy soil

期刊

EUROPEAN JOURNAL OF SOIL BIOLOGY
卷 86, 期 -, 页码 8-15

出版社

ELSEVIER FRANCE-EDITIONS SCIENTIFIQUES MEDICALES ELSEVIER
DOI: 10.1016/j.ejsobi.2018.01.008

关键词

Pentachlorophenol; Biostimulation; Electron donor; Dechlorinating bacteria; High-throughput sequencing

资金

  1. National Key R & D Program of China [2017YFD0800700]
  2. Special Fund for Agro-Scientific Research in the Public Interest of China [201503107-4]
  3. Science and Technology Foundation of Guangdong Province, China [2016A020209005, 2015A030313752, 2016TX03Z086, 2016B020242006]
  4. Special Foundation for Excellent Young Scientists of GDAS [rcjj201503]
  5. Scientific Platform and Innovation Capability Construction Program of GDAS [2016GDASPT-0212, 2017GDASCX-0406, 2016GDASPT-0105]
  6. Science and Technology Foundation of Guangzhou, China [201704020200, 201710010128]
  7. Guangdong Province Higher Vocational Education Brand Specialty Construction project [2016gzpp036]
  8. 59th China's Post-doctoral Science Fund [2016M592715]

向作者/读者索取更多资源

Electron donor supplements are commonly used to enhance the degradation of soil organochlorine contaminants. Dynamic processes of pentachlorophenol (PCP) dechlorination induced by adding electron donors are well known, however, their effects on the microbial communities providing these activities are only poorly understood. In this study, the effect of three electron donors (citrate, glucose and lactate) on the rate and extend of PCP dechlorination, and on the prokaryotic (bacterial and archaeal) community structure was investigated. The addition of citrate or lactate increased reductive dechlorinated rates of PCP, whereas the addition of glucose decreased the rates. High-throughput sequencing analysis of microbial communities in the microcosms found that Pseudomonas, Hydrogenophaga, Clostridium, Dendrosporobacter, Burkholderiaceae, and Fervidicella were the main microorganisms in treatments without electron donor additives, and treatments with citrate or lactate. With the glucose treatment, Clostridium, Fervidicella, Sedimentibacter and Acetivibrio were observed to be the main genera. The addition of citrate and lactate enhanced the population of bacteria with a known potential of reductive dechlorination, with the consequence of accelerating the dechlorination of PCP. However, the addition of glucose stimulated the activities of the organisms that can utilize glucose but cannot dechlorinate PCP. These findings indicate the critical role of different electron donors in stimulating different microorganisms and suggest the appropriate selection of electron donors for accelerating the bioremediation of PCP-contaminated soils.

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