Sustained bacterial N2O reduction at acidic pH

Guang He, Gao Chen, Yongchao Xie, Cynthia M. Swift, Diana Ramirez, Gyuhyon Cha, Konstantinos T. Konstantinidis, Mark Radosevich and Frank E. Löffler ()
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Guang He: The University of Tennessee, Knoxville
Gao Chen: The University of Tennessee, Knoxville
Yongchao Xie: The University of Tennessee, Knoxville
Cynthia M. Swift: The University of Tennessee, Knoxville
Diana Ramirez: The University of Tennessee Knoxville
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

Nature Communications, 2024, vol. 15, issue 1, 1-14

Abstract: 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.

Date: 2024
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DOI: 10.1038/s41467-024-48236-x

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