Antimicrobiana de bactérias endofíticas isoladas de Jacaranda decurrens Cham. (Carobinha-do-Campo)
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2016
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Resumo
Bacteriocins are antibiotics classified as natural products, in other words, secondary
metabolites produced by bacteria. Endophytic, micro-organisms that have plants as
hosts in at least one life stage, are a good example of bacteriocin producers. The aim
of this work was to evaluate the antimicrobial activity probably due to bacteriocin
production by endophytic bacteria isolated from Jacarranda decurrens Cham. against
different indicator strains and the bioactive metabolites sensibility to temperature (75-
80ºC) and to trypsin in two different media. It was used 10 endophytic bacterial
isolates previously isolated from Jacaranda decurrens Cham. 70% of the isolated
presented antimicrobial activity, evidenced by inhibition halos in agar plates against
at least one of the 15 indicators strains. The antimicrobial compounds generated by
the isolates CAR 4, CAR 5 and CAR 7 were thermolabile and resistant to trypsin. The
metabolites produced by CAR 6 were sensible to the heat and the enzymatic
treatment and the isolates CAR 2, CAR 4, CAR 5 and CAR 7 also produced
substances sensible to these conditions. The production of the antimicrobial
compounds just happened in media 523 and it was not observed the presence of
bacteriophages. Substances with bacteriocinogenic activity and with broad spectrum
of action against pathogenic organisms was produced by the endophytic bacteria
from the medicinal plant, thus exhibiting interesting potential to be applied as
antimicrobials and in biological control.
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Bactérias, Endofíticos, Potencial bacteriocinogênico, Bacteria, Endophytic, Bacteriocinogenic potential
Citação
CARRIM, Aysha et al. Antimicrobiana de bactérias endofíticas isoladas de Jacaranda decurrens Cham. (Carobinha-do-Campo). Enciclopedia Biosfera, [S. l.], v. 13, n. 23, 2016. DOI: 10.18677/Enciclopedia_Biosfera_2016_122. Disponível em: https://conhecer.org.br/ojs/index.php/biosfera/article/view/1302. Acesso em: 22 nov. 2024.