[Hongos endófitos de plantas tropicales etnoveterinarias y su eficacia antibacteriana contra cepas capsulares de Pasteurella multocida tipo a]
Microbiology Laboratory, Department of Biotechnology and Bioinformatics, North-Eastern Hill University, Shillong, India
Abstract
Pasteurella multocida
is an important veterinary pathogen causing infections in animals and
birds. Nowadays, different reports have described the severity of
infections, increasing resistance of micro-organisms to antibiotics, and
the contribution of ethnoveterinary
practices towards the treatment of various ailments of animals. The aim
of the present study was to investigate the antibacterial efficacy of
the ethanolic extracts of endophytic fungi against P. multocida Capsular
Type A strains. A total of six endophytic fungi were isolated from two
tropical ethnoveterinary
plants: Garcinia xanthochymus H. and Polygonum chinense L. The ethanolic
extracts of the endophytic fungi were subjected to in vitro
antimicrobial activity by the well diffusion method. Besides, we
evaluated the treatment of mice with the potent fungal extract and
observed the effects in different organs under electron microscopy. Our
results showed that four fungi had antimicrobial activity against the
selected pathogen. The best antibacterial activity was showed by the
extract of the endophytic fungi, Glomerella magna isolated from G.
xanthochymus, with a minimum inhibitory concentration of 46.9 µg/mL and
minimum bactericidal concentration of 750 µg/mL. Treatment of mice with
the potent fungal extract caused a considerable inhibitory effect on the
pathogen growth in vital organs, results that was also confirmed by
histopathological studies made by scanning electron microscopy. The
present findings indicated that the endophytic fungi G. magna has the
potential to provide an effective treatment against infections caused by
Pasteurella multocida. However, the isolation of bioactive components
needs further investigation. © 2016, Universidad de Costa Rica. All
rights reserved.
Author keywords
Antibacterial; Endophytic fungi; Ethnoveterinary plants; Pasteurella multocida; Scanning electron microscopy
ISSN: 00347744Source Type: Journal
Original language: English
DOI: 10.15517/rbt.v64i2.18584Document Type: Article
Publisher: Universidad de Costa Rica
Joshi, S.R.; Microbiology Laboratory, Department of Biotechnology and
Bioinformatics, North-Eastern Hill University, India; email:srjoshi2006@yahoo.co.in
© Copyright 2016 Elsevier B.V., All rights reserved.
© Copyright 2016 Elsevier B.V., All rights reserved.