BIOASSAY OF DIFFERENT TOBACCO CULTIVARS' ACTIVITY OF POD, PPO AND PAL IN INTERACTION WITH Pseudomonas Syringae

The activity of POD,PPO and PAL had close relationship with the resistant or susceptible squash cultivars.The activity of POD and PPO were not distinctly different between the healthy leaves of resistant cultivars and the susceptible ones,and the activity of PAL was distinctly different.After inoculation,the activity of POD emerged two higher points in 12d,16d,the activity of PPO emerged two in 10d,14d while the activity of PAL emerged two in 10d,16d.