Pages: 45-50

Phytochemical and antimycelial activities of selected West African medicinal plants against Lasiodiplodia theobromae (Pat.) Griffth and Maubl

Author: J. M. Ehiobu, J. C. Igborgbor, I. F. Diete-Spiff, I. H. Madar and G. I. Ogu

Category: Biology

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Abstract:

The drive to search for phytochemicals with active antimicrobial potentials has increased in recent years. This has inspired investigation some indigenous medicinal plants exploited in traditional medicines. The leaf extracts (aqueous and Ethanolich fractions) of Diodia scandens, Sacoglottotis gabonensis, Sterculia oblongata, Cyathula prostrate evaluated for antimycelial activities against Lasiodiplodia theobromae isolated from rotten yam tubers. The phytochemical constituents of each plant were also investigated. All the plants demonstrated antimycelial activities against the selected pathogens. The Ethanolic extracts (100 mg/mL) of D. scandens had the best mean antimycelial activity (74.8 %), while the least active extract was S. oblongata (55.0 %), though this was not significantly different from those of C. prostrate (58.9 %) and S gabonensis (59.2 %) extracts. The effects were comparable to Nystatin activities (97.4 %), used as reference drugs. The observed antifungal activities could be attributed to the various concentrations of the phytochemicals, tannins, saponins, flavonoids, alkaloids, steroids and cardiac glycosides, detected in each extract. Findings from this study suggest that the ethanoic leaf extracts of these plants possess bioactive ingredients that could be exploited in the management of L. theobromae, a major pathogen of wide range of crops in tropical countries.

Keywords: Mycelium, phytochemicals, plant extracts, Lasiodiplodia theobromae


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