Effects of endophytic fungi on the ash dieback pathogen.

摘要: While Hymenoscyphus fraxineus causes dieback of the European ash ( Fraxinus excelsior ), flowering F. ornus ) appears resistant to pathogen. To date, contributions endophytic fungi host resistance are unknown. The following hypotheses were tested: (i) enhance pathogen; (ii) relies on its community fungi. Two experiments performed. effect exudates endophytes germination rate H. ascospores was studied in vitro . Isolates abundant leaf endophytes, such as Venturia fraxini, Paraconiothyrium sp., Boeremia exigua, Kretzschmaria deusta and Neofabraea alba inhibited ascospore germination. Ash seedlings inoculated a climate chamber, with sporulating previous year's litter, exposed natural infections by pathogen present forest. Non-inoculated used controls. spp. dominated endophyte ‘communities’. Subsequent exposure led infection leaves pathogen, but no differences health status between pre-inoculated non-inoculated detected. experienced low rate, independent their colonization These results did not support either hypothesis.