| Abstrakt: |
The minimum inhibitory concentration (MIC) of Origanum vulgare, Aloysia triphylla, Aloysia polystachyaand Mentha piperitaessential oils (EOs) against Fusarium verticillioidesM 7075 (F. moniliforme, Sheldon) were assessed, using the semisolid agar antifungal susceptibility (SAAS) technique. O. vulgare, A. triphylla, A. polystachyaand M. piperitaEOs were evaluated at final concentrations of 10, 20, 40, 50, 100, 200, 250, 500, 1000 and 1500 εl per litre (εl/l) of culture medium. A. triphyllaand O. vulgareEOs showed the highest inhibitory effects on F. verticillioidesmycelial development. This inhibition was observed at 250 and 500 εl/l for EOs coming from Aloysia triphyllaand O. vulgare, respectively. Thus, the effects of EOs on FB1production were evaluated using corn grain (Zea mays) as substrate. The EOs were inserted on the 5th, 10th, 15th and 20th day of maize postinoculation with a conidia suspension of F. verticillioides. O. vulgareand A. triphyllawere applied to give final concentrations of 30 ppm and 45 ppm, respectively. Different effects were observed in the toxicogenicity at the 20th day treatment. The O. vulgareEO decreased the production level of FB1(P< 0.01) while A. triphylaEO increased it (P< 0.001) with respect to those obtained in the inoculated maize, not EOs treated. Results obtained in the present work indicate that fumonisin production could be inhibited or stimulated by some constituents of EOs coming from aromatic plants. Further studies should be performed to identify the components of EOs with modulatory activity on the growth and fumonisins production of Fusarium verticillioides. |
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