Detecção de atividade antibacteriana in vitro nos extratos brutos obtidos a partir do plasmódio de Physarella oblonga (Berk. & Curt.) Morgan (Myxomycetes)

Abstract

2002 ResumoUtilizando-se o teste de difusão em meio sólido, detectou-se atividade antibacteriana em extratos de Physarella oblonga (Physaraceae) obtidos a partir de imobilização plasmodial e do plasmódio in natura. Os extratos foram ativos contra Staphylococcus aureus (halos=14 mmf) e Mycobacterium smegmatis (halos=12 mmf e 13 mmf). Menor inibição foi observada frente a Bacillus subtilis (halos=10 mmf e 9 mmf) e Pseudomonas aeruginosa (halos=10 mmf e 8 mmf). Escherichia coli apresentou resistência a todos os extratos testados. O cromatograma evidenciou semelhanças na composição química dos extratos, justificando as similaridades no potencial inibitório de ambos, sendo as substâncias com Rf 0,91 e 0,82, presentes em ambas as amostras, os prováveis inibidores do crescimento bacteriano. AbstractDiffusion solid medium test was used to detect antibacterial activity in Physarella oblonga (Physaraceae) extracts obtained from plasmodial immobilization and in natura plasmodium. The extracts presented activity against Staphylococcus aureus (halos=14 mmf) and Mycobacterium smegmatis (halos=12 mmf e 13 mmf). Slower inhibition was obtained against Bacillus subtilis (halos=10 mmf e 9 mmf) and Pseudomonas aeruginosa (halos=10 mmf e 8 mmf). Escherichia coli presented resistence to all tested extracts. The chromatogram revealed likeness in the chemical composition of the extracts, explaining similarities in inhibitory potential. The substances with Rf 0,91 and 0,82, present in both extracts, could be inhibitor agents of bacterial growth.Os mixomicetos sintetizam substâncias com atividade biológica, sendo referidas como inibidoras da germinação de sementes e raízes de vegetais superiores, e de microrganismos patogênicos, principalmente bactérias Gram-positivas e

Myxobiota of the Brazilian Atlantic Forest: species on oil palm tree (Elaeis guineensis, Arecaceae)

“…Ribeiro et al (2002) cited P. oblonga as occurring on E. guineensis in the Gurjaú Ecological Reserve. Collected on dead trunks in the Café Forest, P. oblonga was occasionally found on oil palm trees in this study (Tabs.…”

“…Except for the brief references by Farr (1960), Pôrto et al (1985), Ribeiro et al (2002) and Cavalcanti et al (2006), there are no record of the association of myxomycetes and E. guineensis in the studies conducted in Brazil. Yet, approximately one hundred species of myxomycetes have been reported as associated with palm trees in both dry and humid forests (Alves & Cavalcanti 1996;Cavalcanti & Putzke 1998;Mobin & Cavalcanti 1998, 1999a, b, 2000, 2001Cavalcanti & Mobin 2004).…”