Details of qPCR assay Li Liao, et al. submitted to Molecular Ecology Table 2. Information of qPCR assay of standard curves. Gene Efficiency (%) Y-intercept R2 Ct of NTCa narG 106.2 35.00 1.000 No Ct napA 101.7 33.84 0.999 No Ct nasA 102.1 34.06 1.000 No Ct glnAsym 107.0 33.89 1.000 No Ct gltBsym 104.0 33.53 0.999 No Ct rpoA 109.0 35.25 0.999 36.75 cysG 105.5 33.37 1.000 No Ct gyrB 107.6 33.18 1.000 No Ct mraY 101.2 34.13 1.000 No Ct glnARid 91.6 37.15 0.998 No Ct gltBRid 103.7 34.35 1.000 35.99 ACTB 103.2 35.23 0.997 No Ct aNo template control. Slope Threshold -3.182 0.8205 -3.283 0.6752 -3.272 0.9635 -3.165 0.7804 -3.229 0.6907 -3.123 0.7765 -3.197 0.9201 -3.153 0.7976 -3.293 0.7947 -3.541 0.8929 -3.237 0.8183 -3.248 0.7355