Antibacterial activity of plant methanolic extracts on a field isolate of <i>Pseudomonas syringae</i> pvtomato from the Casablanca region (Morocco) — Oak Academic Publishing
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Antibacterial activity of plant methanolic extracts on a field isolate of <i>Pseudomonas syringae</i> pvtomato from the Casablanca region (Morocco)
Laboratory of Physiology & Molecular Genetics, Faculty of Sciences Ain Chock, Casablanca, Morocco
,
Ibn Rochd University Hospital, Casablanca, Morocco
,
Institute for Plant Biochemistry and Photosynthesis (IBVF), CSIC-Universidad de Sevilla, Seville, Spain
,
Laboratory of Physiology & Molecular Genetics, Faculty of Sciences Ain Chock, Casablanca, Morocco
1 Laboratory of Physiology & Molecular Genetics, Faculty of Sciences Ain Chock, Casablanca, Morocco
2 Ibn Rochd University Hospital, Casablanca, Morocco
3 Institute for Plant Biochemistry and Photosynthesis (IBVF), CSIC-Universidad de Sevilla, Seville, Spain
4 Laboratory of Physiology & Molecular Genetics, Faculty of Sciences Ain Chock, Casablanca, Morocco
A bacterial field isolate recovered from infected tomato plants in a green-house at Sidi Rehal, a region near Casablanca city (Morocco), was identified as the gammaproteobacterium Pseudomonas syringae pv. tomato DC3000 strain, the causal agent of bacterial speck. The bacterial isolate was characterized by morphological, biochemical and molecular biological tests, its growth curves carried out in various culture media, and its phytopathogenicity verified by infection tests. A screening was performed to evaluate the antibacterial activity of methanolic extracts of 12 selected Moroccan plants against the P. syringae pv. tomato DC3000 isolate, and Agar-well diffusion and Broth microdilution methods were used to determine minimum inhibitory and minimum bactericidal concentrations. Among the methanolic extracts tested, only those of Nigella sativa , Geranuim robertianum , Aizoon canariense and Rubia peregrine showed clear inhibitory and bactericidal activities, although the highest values were achieved with N. sativa , a plant used in Morocco as a spice, condiment and medicinal treatment.
KeywordsBacterial SpeckBacterial Field IsolateLOPATPathogenicity TestsAntibacterial ActivityMethanolic Plant Extracts<i>Nigella sativa</i>
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