Effects of different concentrations of NaNO_2 on the degradation ability,nitrite reductase( NiR) activity and cell surface properties of Lactobacillus plantarum( Lp) FQR were investigated,and the cell morphology of which was observed by electron microscope. The results showed that the degradation ability and NiR activity of FQR was decreasing with the increase of NaNO_2 concentrations within 0-0. 150%. Under the condition of 0. 045%NaNO_2,FQR could efficiently degrade NaNO_2 within 16 h with(94. 85 ± 2. 96)...