Parameters   Treatments POD  (U min-1 g-1fresh wt) PPO (U min-1 g-1  fresh wt) PAL (µmole t-cinnamic acid hr-1g-1fresh wt)
Uninoculated treatment (control) 17.56 1.46 397.41
B. fabae 25.28 2.51 588.37
Fungicide (Ridomil MZ) 17.19 1.38 391.73
Fungicide +B. fabae 23.90 2.46 584.49
Shikimic acid 19.86 1.97 433.33
Shikimic acid + B. fabae 31.41 2.93 632.29
Salicylic acid 22.74 2.14 442.89
Salicylic acid + B. fabae 32.82 3.08 666.15
Salicylic acid +Shikimic acid 17.40 1.50 396.12
Salicylic +Shikimic + B. fabae 27.33 2.81 628.68
LSD at P≤0.05 0.57 0.08 2.69
Table 4: Effect of shikimic acid, salicylic acid and their combination on peroxidase(POD), polyphenol (PPO) and phenylalanine ammonia lyase (PAL) enzymes activities in the shoot of faba bean plants infected with chocolate spot disease.