The effect of exogenous melatonin in the regulation of the degradation of residual fungicide in Tomato

Abstract

Fungicides are widely used to control pathogen in modern agriculture. In particular, in the process of vegetable production, the use of fungicides could control a variety of diseases to increase crop yield. However, it is common that excessive and unsuitable application of pesticide cause serious pesticide residue in vegetables, which leads to problems of food safety and environment pollution. Therefore, it should not be ignored to reduce fungicide residue in vegetable. In order to confirm the effect of exogenous melatonin on degradation of residual fungicide in plant and explore the mechanism of regulation, Chlorothalonil was taken as experiment material in the present study, and exogenous melatonin was applied as pretreatment to investigate the mechanism of the degradation of residual Chlorothalonil in tomato. It is demonstrated that exogenous melatonin pretreatment could promote the degradation and metabolism of CHT residue in tomato plants by inducing the redox signal, improving the antioxidant system, enhancing antioxidant enzymes and increasing the ratio of GSH/GSSG to scavenge reactive oxygen species. And the activity of GST and GR enzymes were also enhanced to conduct detoxification, which result in a pronounced decrease in the residue of CHT in tomato.