Abstract
A new anthraquinone, 7-(γ,γ)-dimethylallyloxymacrosporin (1), along with five known analogues, macrosporin (2), 7-methoxymacrosporin (3), tetrahydroaltersolanol B (4), altersolanol L (5), and ampelanol (6), were isolated from the mangrove endophytic fungus Phoma sp. L28. All of them were first found in Phoma sp. Their structures were established by comprehensive spectroscopic analyses and comparison with the published data. These compounds displayed in vitro antifungal activities against Colletotrichum musae (Berk. & M. A. Curtis) Arx., Colletotrichum gloeosporioides (Penz) Sacc., Fusarium graminearum Schw., Penicillium italicum Wehme, Fusarium oxysporum Schlecht. f. sp. lycopersici (Sacc.) W.C. Snyder et H. N. Hansen, and Rhizoctonia solani Kuhn at different levels. Notably, compound 2 exhibited potent antifungal activity against Fusarium graminearum Schw. as compared with the positive control carbendazim.
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