Abstract:

In order to clarify plant communication induced by herbivory, cotton and corn were used as materials to study plant communication in different treatments, including cotton induced by aphid and artificial wound and its corresponding corn nearby, and corn induced by corn borer feeding and artificial wound and its corresponding cotton nearby. The activities of polyphenol oxidase and peroxidase were detected using spectrophotometry in different treatments. The results showed as followings: the activities of polyphenol oxidase and peroxidase were increased in cotton induced by aphid infestation and artificial wound. The activity of polyphenol oxidase in cotton infested by aphid was 1.61 fold the control and the deference was significantly. The activity of peroxidase in wounded cotton was significantly increased and 1.84 fold the control. The activities of polyphenol oxidase were increased in corn induced by mechanical wounding and corn borer feeding compared to the control, but the difference was not significantly, while the activities of peroxidase in corn induced by mechanical wound and corn borer feeding were increased significantly, and the induced fold was 4.79 and 3.56 respectively. The activities of polyphenol oxidase and peroxidase in the corresponding receiver seedlings were not induced. Polyphenol oxidase and peroxidase didn’t play important role in cotton-corn communication induced by herbivory.