Study On The Effects Of Glucohexaose-Induced Strawberry Leaf Defence Enzymes

Glucohexaose is a kaid of oligochitosan,can activites plant defence systems as elicitor to improve plant resistence disease ability,and can not pollute environment as no poisonous farm chemical.All star and Star capital 1# were the materials of this experiment.Study on changes of five defence enzymes (PAL,POD,PPO,SOD,CAT)activity and lignin content in the leaves of strawberry that were infected with leaf wilt disease and strayed with synthetic glucohexaose of concentration at 0.5% with different glucohexaose concentration,induction plastochron,induction times and applied methods;One treatment is infection,the other one is straying and infection and, the control is not straying and infection. Compared to dynamic changes of five defence enzymes activity and lignin content in the leaves of strawberry in 9 days.The experimental results showd that: Activities of five enzymes and lignin content were observed in the treatment of 50 times of glucohexaose dilution, induction plastochron is 7 days,the three inductions times and glucohexaose with Tween80 result in good effect;Activities of five defence enzyme and lignin content of two strawberry cultivars showd similar trend,increased at first and followed by a decrease, the induced peaks of the straying and infection is 7 days, the infection is 8 days and , the control isn,t significant change .The change was lower in susceptible cultivar (Star capital 1# )than in resistant cultivar(All star).Correlation between control effect with activities of five defence enzymes and lignin content shows positive correlation and linerity effect and their double correlation coefficients all show significance(p<0.01).Activities of five defence enzymes and lignin content may used as strawberry induction resistance disease idendifing index.