Effects of toxins from Lecanosticta acicola against volatile components of Eupatorium adenophorum

The volatile components of Eupatorium adenophorum fresh leaves, both in vitro leaves and leaves of in vitro plants intimidated by toxins from Lecanosticta acicola were analyzed by GCMS. Results showed that 1) thirtynine volatile organic compounds were isolated and identified from fresh leaves, sixty volatile compounds from in vitro leaves intimidated by toxins, and fiftythree volatile compounds from leaves of in vitro plants intimidated by toxins. 2) Components and numbers of volatile organic compounds from different methods were different. When E. adenophorum was intimidated by toxins, leaves gave off more compounds which had antibacterial and insecticidal activity. It implies that toxins can induce E.adenophorum enhancing chemical defence. 3) The toxins may influence other aspects of chemical defense of E. adenophorum. So more attention should be paid to the effect of pathogen toxins on inducing weed chemical defence. It may be beneficial to seek out efficient pathway to control alien invasive weeds.