Sprengel (eupatorium Adenophorum) Leaves The Symbiotic Bacteria Invaded Plant Communities

Exotic plant Eupatorium adenophorum is one of the most notoriously invasive plants in China. This weed mainly invades the southwest of China in current, where local ecological system, biodiversity, as well as economy are affected adversely. More and more ecologists and biologists have focused their attentions on the invasive mechanisms of E. adenophorum. However, most research works concentrate on characterizing the biology and alleopathy of E. adenophorum. In present case, the effects of endophytic microbes of E. adenophorum on the plant community in the introduced range were evaluated, and the possible role of endophytic microbes in enhancing the establishment and spread of E. adenophorum were discussed.Both effects of leaf endophytic microbes as a whole and three dominant fungal endophytes of E. adenophorum on the plant community were evaluated in green house as well as in field, several conclusions were made:1. In total, the leaf endophytic microbes, as a whole, affect negatively the biodiversity and biomass of plant community living around of E. adenophorum, however, the the effect on different plant species is distinct. Among the tested plant species, individual biomass of Galinsoga parviflora was decreased significantly.2. Three dominant fungal endophytes of E. adenophorum also affect negatively the biodiversity and biomass of plant community living around of E. adenophorum. However, fungal strains displayed distinct effects on the growth of different plant species. The No.2 strain belonging to Alternaria affects negatively most plant species both in number and in biomass.3. Both leaf endophytic microbes as a whole and tested three dominant fungal endophytes benefit the survival of E. adenophorum seedlings. In particular, the No.1 strain belonging to Alternaria increases 8.7 times the survival of E. adenophorum seedlings relative to control.4. Investigation performed in field, showed that both the number of fungal spores and the number of Alternaria spores in atmosphere displayed a significant negative relationship with the biodiversity of plant community around of E. adenophorum habitat.In conclusion, leaf endophytic microbes of E. adenophorum indeed affect negtively biodiversity of plant community by an unknown mechanism. Consequently, such a negative feedback regulation indirectly enhances the establishment and spread of E. adenophorum.