Abstract: Induce peanut plants to spot disease resistance by spraying salicylic acid on leaves,pathogen culture filtrate,oxalic acid and other factors. Then determine the changes of host defense enzyme activity and、PRl gene expression to explore the induced disease resistance and its mechanism. Results show that peanut can get systemic resistance by induction. Best results for 2. 0 mmol/L salicylic acid induced peanuts and the controlling efficacy was 35 .3%.The host defense enzyme activity was positively correlated with the intensity of induced disease resistance,but the induced disease resistance response changes of several defense enzymes varies greatly from the other. Realtime fluorescent quantitative PCR analysis showed that the tendency for 2. 0 mmol/L of SA induced、PRl expreslion in peanut leaf volume increased significantly after treatment, which is closely related to the induction of disease res.stance.

Key words: Peanut web blotch, Induced resistance, Salicylic acid, Host defense enzymes, NPRl gene

CLC Number: 

• S565.201