Three new compounds of Umbelopsis dimorpha VDG10, a dominant endophytic fungus from Vaccinium dunalianum Wight

Abstract

Three novel compounds, including an aromatic amino acid, dimorine A (1), a suncheonoside derivative, dimoroside A (2), and a phenylpropanoid glycoside, dimoroside B (3), together with four known compounds (4–7) were separated from Umbelopsis dimorpha VDG10, the predominant endophytic fungus found in the roots of Vaccinium dunalianum Wight (Ericaceae). Their structures were elucidated by spectroscopic methods, and the ECD spectrum confirmed the absolute configuration of 3. In addition, the antifungal activities of novel compounds against five phytopathogenic fungi were evaluated. The results indicated that compound 3 has a better inhibitory effect on Alternaria brassicicola than the broad-spectrum antifungal agent thiabendazole, and its MICs of 15.63–7.82 μg/mL.