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Identification of novel potential acetate-oxidizing bacteria in thermophilic methanogenic chemostats by DNA stable isotope probing

  • Dan Zheng
  • Hui-Zhong Wang
  • Min Gou
  • Masaru Konishi Nobu
  • Takashi Narihiro
  • Bin Hu
  • Yong Nie
  • Yue-Qin TangEmail author
Environmental biotechnology
  • 4 Downloads

Abstract

Syntrophic oxidization of acetate and propionate are both critical steps of methanogenesis during thermophilic anaerobic digestion. However, knowledge on syntrophic acetate-oxidizing bacteria (SAOB) and syntrophic propionate-oxidizing bacteria (SPOB) is limited because of the difficulty in pure culture isolation due to symbiotic relationship. In this study, two thermophilic acetate-fed anaerobic chemostats, ATL (dilution rate of 0.025 day−1) and ATH (0.05 day−1) and one thermophilic propionate-fed anaerobic chemostat PTL (0.025 day−1) were constructed, AOB and POB in these chemostats were studied via microbial community analysis and DNA stable-isotope probing (SIP). The results showed that, in addition to Tepidanaerobacter, a known SAOB, species of Thauera, Thermodesulfovibrio, Anaerobaculum, Ruminiclostridium, Comamonas, and uncultured bacteria belonging to Lentimicrobiaceae, o_MBA03, Thermoanaerobacteraceae, Anaerolineaceae, Clostridiales, and Ruminococcaceae were determined to be potential AOB in chemostats. Pelotomaculum was the key SPOB detected in the propionate-fed chemostat. Based on the intense fluorescence of coenzyme F420, majority of Methanosarcina cells in acetate-fed chemostats were involved in hydrogenotrophic methanogenesis, suggesting the existence of highly active SAOB among the detected AOB. In the propionate-fed chemostat, most of the species detected as AOB were similar to those detected in the acetate-fed chemostats, suggesting the contribution of the syntrophic acetate oxidization pathway for methane generation. These results revealed the existence of previously unknown AOB with high diversity in thermophilic chemostats and suggested that methanogenesis from acetate via the syntrophic oxidization pathway is relevant for thermophilic anaerobic digestion.

Keywords

Thermophilic methanogenesis Stable isotope probing Acetate-oxidizing bacteria Propionate-oxidizing bacteria Microbial community 

Notes

Funding Information

This study was funded by the Ministry of Science and Technology of China (No. 2016YFE0127700) and the National Natural Science Foundation of China (No. 51678378).

Compliance with ethical standards

Conflict of interest

The authors declare that they have no competing interests.

Ethical approval

This article does not contain any studies with human participants or animals performed by any of the authors.

Supplementary material

253_2019_10078_MOESM1_ESM.pdf (1.2 mb)
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Copyright information

© Springer-Verlag GmbH Germany, part of Springer Nature 2019

Authors and Affiliations

  1. 1.College of Architecture and EnvironmentSichuan UniversityChengduPeople’s Republic of China
  2. 2.Biogas Institute of Ministry of Agriculture and Rural AffairsChengduPeople’s Republic of China
  3. 3.Bioproduction Research InstituteNational Institute of Advanced Industrial Science and Technology (AIST)IbarakiJapan
  4. 4.College of EngineeringPeking UniversityBeijingChina

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