Abstract
Secondary metabolites were extracted from culture filtrate of three isolates of the mycoparasitic biocontrol agent Verticillium biguttatum and two antifungal metabolites isolated using a standard TLC procedure. The structures of 1-[2′,3′-dihydroxy-5′-(hydroxymethyl)phenyl]-3-methyl-but-2-ene and 1-[2′-hydroxy-3′-methoxy-5′-(hydroxymethyl)phenyl]-3-methyl-but-2-ene were elucidated by spectroscopic analysis. These new metabolites were named bigutol and methylbigutol, respectively. Low concentrations of each metabolite inhibited mycelial extension of Rhizoctonia solani (minimum inhibitory concentration 138 μg ml −1) and other plant pathogenic fungi on potato dextrose agar. Production of these antifungals by V. biguttatum suggests that antibiosis may play a role during biocontrol by this mycoparasite, particularly of plant diseases caused by R. solani.
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