The Relation Between the Resistance of the Cucumber Wilt and the Activities of Several Enzyme in Defense System

Using the six different resistant strains of the cucumber to Fusarium oxysporum,this paper studied the activity changes of superoxide dismutase(SOD),peroxidase dismutase(POD),polyphenol oxidase(PPO)and phenylalanine ammonia-lyase(PAL)in leaf tissue.The results showed that the activity of POD,SOD,PPO have two peaks and a single peak in the PAL.The first of the enzyme peak was significantly higher in resistant strains than that in susceptible strains,showing consistency.There was a significant positive correlation between the activity of SOD,PPO and resistance,and a notable positive correlation between the activity of POD,PAL and resistance.