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An Unknown Non-denitrifier Bacterium Isolated from Soil Actively Reduces Nitrous Oxide under High pH Conditions
Microbes and Environments  (IF2.912),  Pub Date : 2020-01-01, DOI: 10.1264/jsme2.me20100
Yuta Takatsu, Toshizumi Miyamoto, Yasuyuki Hashidoko

A nitrous oxide (N2O)-consuming bacterium isolated from farmland soil actively consumed N2O under high pH conditions. An acetylene inhibition assay did not show the denitrification of N2 to N2O by this bacterium. When N2O was injected as the only nitrogen source, this bacterium did not assimilate N2O. A polymerase chain reaction demonstrated that this bacterium did not have the typical nosZ gene. This bacterium belonged to Chitinophagaceae, but did not belong to known families that include bacteria with the atypical nosZ. This is the first study to show that a non-denitrifier actively reduces N2O, even under high pH conditions.