Antibacterial activity of medicinal plant extracts against Ralstonia solanacearum (Smith) that causes bacterial wilt in hot pepper (Capsicum annuum L. )
Acta sci., Biol. sci
;
41: e45402, 20190000. ilus, tab, graf
Article
in English
| LILACS, VETINDEX
| ID: biblio-1460867
ABSTRACT
This study was conducted to evaluate the in vitro antibacterial activity of some medicinal plants against Ralstonia solanacearum. Bioactive chemicals were extracted from Burcea antidysenterica, Eucalyptus citriodora, Justicia schimperiana, Lantana camara, Melia azedarach and Ricinus communis leaves using maceration method. The bioassay was evaluated by disc diffusion method. The pathogen was isolated from infected Capsicum annuum plants using Casamino acid-Peptone-Glucose agar (CPG) medium. The isolate was identified using cultural, biochemical characteristics, pathogenicity test and found to be R. solanacearum. The methanol extracts had different composition, percentage extract yield, antibacterial activity and relative percentage inhibition. Unlike others, extracts of E. citriodora and R. communis consisted of all the tested secondary metabolites. All species showed antibacterial activity except M. azedarach. Significant differences were recorded in antibacterial activity among species and test concentrations. The highest antibacterial activity and the lowest bacteriostatic and bactericidal concentrations were found from E. citriodora and R. communis extracts. The higher potency of E. citriodora and R. communis extracts suggested the potential of the two species as a biocide to control bacterial wilt. However, further in vivo studies on these species extracts are compulsory.
Full text:
Available
Index:
LILACS (Americas)
Main subject:
Ralstonia solanacearum
/
Anti-Bacterial Agents
Type of study:
Etiology study
/
Prognostic study
Language:
English
Journal:
Acta sci., Biol. sci
Year:
2019
Type:
Article
Institution/Affiliation country:
Bahir Dar University/ET
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