Table 2. Production of N₂O by strain JAM1 and the JAM1ΔnarG1narG2 double mutant.

Concentrations of ${\mathrm{NO}}_3^{-}$, ${\mathrm{NO}}_2^{-}$ and N₂O were measured after 96 h (OD_600nm ∼ 1.2) of incubation in strain JAM1 and JAM1ΔnarG1narG2 cultured under oxic conditions with (A) 16.8 mg-N vial⁻¹ ${\mathrm{NO}}_3^{-}$ added at T0h or (B) 4.7 mg-N vial⁻¹ ${\mathrm{NO}}_2^{-}$ added at T24h. The results are derived from triplicate cultures. Data represent mean values (SD) (n = 3).

Strain	Conditions	${\mathrm{NO}}_3^{-}$ (mg-N vial−1)	${\mathrm{NO}}_2^{-}$ (mg-N vial−1)	N2O (mg-N vial-1)
JAM1	A	0.17 ± 0.06	16.6 ± 0.7	0.14 ± 0.01
JAM1ΔnarG1narG2	A	17.1 ± 0.1	0.22 ± 0.22	0.004 ± 0.002
JAM1	B	0	4.25 ± 0.09	0.11 ± 0.03
JAM1ΔnarG1narG2	B	0	4.87 ± 0.39	0.18 ± 0.02