Effects of degradation bacteria on reactive oxygen species and protective enzymes of tobacco leaves under quinclorac stress.

The objectives for this research were to study effect of reactive oxygen species and protective enzyme of tobacco leaves by the way of mixing the same concentration of quinclorac and different amount of degradation bacteria into soil under stress of quinclorac.Transplanting ofter 20 days,the results showed that,compared with control,adding degrading bacteria can not only reduce content of superoxide anion radical(O-· 2),hydroxyl radical(·OH),hydrogen peroxide(H2O2) and malondialdehyde(MDA),23%、39%、25%、49% respectively,but also increase the content of superoxide dismutase(SOD),catalase(CAT) and peroxidase(POD) activity 66%、51%、48%,respectively in tobacco leaves.Overall,with the amount of degradation bacteria increasing,the active of protective enzyme can be increased and active of reactive oxygen species obviously can be decreased.The optimal amount of degradation bacteria was 3×1010cells/g.