AvaliaÃÃo da atividade antimicrobiana de fungos e actinobactÃrias endofÃticos isolados de Conyza bonariensis (L) Cronquist. (Rabo-de-Raposa)

AUTOR(ES)
DATA DE PUBLICAÇÃO

2006

RESUMO

Endophytic microorganisms are found in practically all plants in the nature. These microorganisms inhabit the interior of tissues of plants where they keep symbiotic relations, producing or contributing for the bioactive compounds production that will be able to favor the development of the plant. These substances, once isolated and characterized, have great potential to be used in Medicine. In several cases these substances are produced by endophytic microorganisms isolated of plants used in the popular medicine. Conyza bonariensis (L.) Cronquist, belongs to the Asteraceae family, and is popularly known as tail-of-fox. It is used by the popular medicine against superficial mycoses. A total of 53 fungi, 126 bacteria and four actinobacteria had been isolated from Conyza bonariensis. Was found high occurrence of bacteria in the roots (16,33%) and of fungi in leaves (10%). The actinobacteria were found in very low frequency (1,3%). It was evaluated the antimicrobial activity by the method of the "Block of Gelose" of the fungi and actinobacteria against Staphylococcus aureus, Bacillus subtilis, Escherichia coli, Mycobacterium tuberculosis, Candida albicans, Malassezia furfur and M. simpodialis. Strains presenting greater specter had been selected for test of disc diffusion of the metabolities. Eb26F, EbR33, Eb3F, Eb30F, EbR84 presented better activity in Czapek medium (120h); EbR83 and EbR33, in MPE medium (120h) and EbR49A, in ISP-3 (72h). The inhibition halos varied between 10mm and 30mm

ASSUNTO(S)

plantas microbiologia conyza bonariensis microrganismos endofÃticos

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