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Rice fields are a significantly sources of atmospheric methane. Methanotrophic bacteria are unique in their ability to utilize methane as a sole carbon source and their ability to fix N 2 . This research successfully characterized N 2  fixation activity under different oxygen concentrations of methanotrophic bacteria isolated from rice fields. From 19 tested isolates, four isolates performed activity to fix N 2 . They could fix N 2  on different concentration of air saturation (10 % up to 100%). The growth of methanotrophs is not directly corelated with the N 2  fixation activity, and their N 2  fixation activities are affected by O 2  concentrations. The BGM 3 and BGM 9 isolates had very good N 2  fixation activity. Their activities were increased by increasing air saturation up to 50% (approximately 10% O 2 ), but then decrease by increasing air saturation from 50% (approximately 10% O 2 ) to 100% (approximately 20% O 2 ). However, the highest N 2  fixation activity was performed by the BGM 9 isolate at 30% air saturation (approximately 6% O 2 ), and the isolate was identified as  Methylococcus capsulatus . This information can support application of the isolates to achieve sustainable and environmentally friendly agricultural system.

iop conference series. earth and environmental science

Nitrogen (N<sub>2</sub>) fixation activity under different oxygen concentration of methanotrophic bacteria isolated from rice fields and their molecular identification

Nitrogen (N2) fixation activity under different oxygen concentration of methanotrophic bacteria isolated from rice fields and their molecular identification

Nitrogen (N₂) fixation activity under different oxygen concentration of methanotrophic bacteria isolated from rice fields and their molecular identification