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Sustained bacterial N2O reduction at acidic pH

Author

Listed:
  • Guang He

    (The University of Tennessee, Knoxville
    The University of Tennessee, Knoxville)

  • Gao Chen

    (The University of Tennessee, Knoxville
    The University of Tennessee, Knoxville)

  • Yongchao Xie

    (The University of Tennessee, Knoxville
    University of California, Los Angeles)

  • Cynthia M. Swift

    (The University of Tennessee, Knoxville
    The University of Tennessee, Knoxville)

  • Diana Ramirez

    (The University of Tennessee Knoxville
    Oak Ridge National Laboratory)

  • Gyuhyon Cha

    (Georgia Institute of Technology)

  • Konstantinos T. Konstantinidis

    (Georgia Institute of Technology)

  • Mark Radosevich

    (The University of Tennessee, Knoxville)

  • Frank E. Löffler

    (The University of Tennessee, Knoxville
    The University of Tennessee, Knoxville
    The University of Tennessee, Knoxville
    The University of Tennessee Knoxville)

Abstract

Nitrous oxide (N2O) is a climate-active gas with emissions predicted to increase due to agricultural intensification. Microbial reduction of N2O to dinitrogen (N2) is the major consumption process but microbial N2O reduction under acidic conditions is considered negligible, albeit strongly acidic soils harbor nosZ genes encoding N2O reductase. Here, we study a co-culture derived from acidic tropical forest soil that reduces N2O at pH 4.5. The co-culture exhibits bimodal growth with a Serratia sp. fermenting pyruvate followed by hydrogenotrophic N2O reduction by a Desulfosporosinus sp. Integrated omics and physiological characterization revealed interspecies nutritional interactions, with the pyruvate fermenting Serratia sp. supplying amino acids as essential growth factors to the N2O-reducing Desulfosporosinus sp. Thus, we demonstrate growth-linked N2O reduction between pH 4.5 and 6, highlighting microbial N2O reduction potential in acidic soils.

Suggested Citation

  • Guang He & Gao Chen & Yongchao Xie & Cynthia M. Swift & Diana Ramirez & Gyuhyon Cha & Konstantinos T. Konstantinidis & Mark Radosevich & Frank E. Löffler, 2024. "Sustained bacterial N2O reduction at acidic pH," Nature Communications, Nature, vol. 15(1), pages 1-14, December.
    • Handle: RePEc:nat:natcom:v:15:y:2024:i:1:d:10.1038_s41467-024-48236-x
    DOI: 10.1038/s41467-024-48236-x
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    References listed on IDEAS

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    1. Florian Breider & Chisato Yoshikawa & Akiko Makabe & Sakae Toyoda & Masahide Wakita & Yohei Matsui & Shinsuke Kawagucci & Tetsuichi Fujiki & Naomi Harada & Naohiro Yoshida, 2019. "Response of N2O production rate to ocean acidification in the western North Pacific," Nature Climate Change, Nature, vol. 9(12), pages 954-958, December.
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