Abstract:

The content levels of chlorophyll, soluble sugar, nucleic acid and protein of crops were promoted by the low concentration(5 mg/L) of melittin, and inhibited by the higher (50 mg/L) one, although the effects were not significant(t-test, P>0.05)in four crops. Their PAL and PPO activities were reached the maximal levels 48 hours after spraying the solution of melittin (5 mg/L), which were increased by 178% and 9.8% respectively as compared with the control, while the activity of SOD was increased by 31.5% after 6 hours. The activity of POD was reached the maximal levels under the treatment of 50mg/L melittin. The land pattern of POD isoenzyme in maize elucidated further that there were strong induction to some zymogram bands(egP11)while inhibition to others, and different effects on the different cultivars showing the particularity of cultivars.

Key words: Melittin, Crops, Physiological indices, Defensive enzyme, Zymogram of isoenzyme