RESUMO:O sisal (Agave sisalana Perrine ex Engelm.) é a principal fonte de extração de fibras duras vegetais do mundo. No Brasil, o cultivo ocupa extensa área de solos pobres na região semi-árida dos Estados da Bahia, Paraíba e Rio Grande do Norte, em regiões com escassa ou nenhuma alternativa para exploração de outras culturas. Tendo em vista a propriedade inibitória dos extratos vegetais sobre o desenvolvimento de fungos, avaliou-se o efeito inibitório do extrato vegetal de alho (Allium sativum L.) sobre o fungo Aspergillus niger isolados da cultura do sisal. O extrato vegetal foi incorporado ao meio BDA fundente, aproximadamente 45ºC, nas concentrações 0, 500, 1000, 2000, 50000, 10000 e 50000 mg L -1 . Os resultados demonstraram que a dose de 50000 mg L -1 de alho foi eficiente na inibição do crescimento do fungo Aspergillus niger "extraídos" da cultura do sisal.Palavras-chave: plantas medicinais, patógenos, extratos vegetais, fungos, alho ABSTRACT: In vitro inhibitory effect of Allium sativum extract on Aspergillus niger Tiegh. Sisal (Agave sisalana Perrine ex Engelm.) is the main source of plant hard fiber extraction in the world. In Brazil, its cultivation occupies a large area of poor soils in the semi-arid region of Bahia, Paraiba and Rio Grande do Norte States, and in regions with scarce or no alternative to explore other crops. Based on the inhibitory property of plant extracts on fungal development, the inhibitory effect of garlic (Allium sativum L.) extract was evaluated on the fungus Aspergillus niger isolated from sisal crop. The plant extract was incorporated into melting PDA medium around 45ºC, at the following concentrations: 0, 500, 1000, 2000, 50000, 10000, and 50000 mg L -1 . (OBS: M. Elena, há duas doses repetidas; creio que a primeira seja 5000). The concentration 50000 mg L -1 garlic extract was effective in inhibiting the growth of the fungus Aspergillus niger extracted from sisal crop.
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