Fig. 7

Redundancy analysis of the relationships among nicotine concentrations, abundance of nicotine-degrading genes and some soil properties in tobacco rhizosphere soils. codH aerobic carbon-monoxide dehydrogenase gene, ndhA nicotine dehydrogenase subunit gene, kdhL 6-hydroxypseudooxynicotine dehydrogenase subunit gene, hmfB 2-furoyl-CoA dehydrogenase gene, mobA molybdenum cofactor cytidylyltransferase gene, nboR nicotine blue oxidoreductase gene, dhponh 2,6-dihydroxypseudooxynicotine hydrolase gene, nctB (S)-6-hydroxynicotine oxidase gene, pncA nicotinamidase gene, nod nicotine oxidoreductase gene, De dehydrogenase, ACP acid phosphatase, AP organic phosphorus, AN alkali hydrolyzed nitrogen, OM organic matter, 4-HA 4-Hydroxybenzoic acid, 3,4-DHA 3,4-dihydroxyphenylacetic acid, Cd cadmium, Zn zinc