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In this study a total of 16 Fusarium verticillioides strains isolated from corn feed samples were characterized by fumonisin (FB) production and random amplified polymorphic DNA (RAPD). All the strains produced FB1 and FB2 with levels ranging from 2.41 to 3996.36 µg/g, and from 1.18 to 1209.91 µg/g, respectively. From the 16 F. verticillioides strains, four were identified as low (3.59 to 1289.84 µg/g), eight as intermediate (>1289.84 to 3772.44 µg/g) and four strains as high (>3772.44 µg/g) fumonisin producers. From the total of 105 loci amplified, 60 (57.14%) were polymorphic. RAPD analysis showed very similar patterns among low, moderate and high fumonisin-producing strains. Although RAPD markers were capable of discriminating the different F. verticillioides strains, there was no clear association between these makers and fumonisin production. Neste estudo, 16 cepas de F. verticillioides isoladas de amostras de ração de milho foram caracterizadas com base na produção de fumonisinas (FB) e em marcadores de polimorfismos de DNA amplificado ao acaso (RAPD). Todas as cepas produziram FB1 e FB2, com níveis variando, respectivamente, de 2,41 a 3996,36 µg/g e 1,18 a 1209,91 µg/g. De acordo com a produção de fumonisinas totais (FB1 + FB2) e a distribuição por análise de quartis, do total de 16 cepas de F. verticillioides, quatro foram identificadas como baixas produtoras de fumonisinas (3,59 a 1289,84 µg/g), oito como intermediárias (>1289,84 a 3772,44 µg/g) e quatro como altas produtoras de fumonisinas (>3772,44 µg/g). Os 10 primers utilizados amplificaram 105 locos, 60 (57,14%) dos quais foram polimórficos. As análises de RAPD mostraram padrões muito similares entre as cepas baixas, médias e altas produtoras de fumonisinas. Embora os marcadores RAPD tenham se mostrado capazes de discriminar as diferentes cepas de F. verticillioides, não foi detectada nenhuma associação entre estes marcadores e a produção de fumonisinas

Fusarium verticillioides strains isolated from corn feed: characterization by fumonisin production and RAPD fingerprinting