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| Format: | Artículo científico |
| Language: | en |
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Academia Brasileira de Ciências
2017
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| Online Access: | https://www.redalyc.org/articulo.oa?id=32753602013 |
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Table of Contents:
- Potential effects of fungicide and algaecide extracts of Annona glabra L. (Annonaceae) on the microalgae Raphidocelis subcapitata and on the oomycete Pythium GISELI S. ROCHA REGINALDO S. MATSUMOTO ANA TERESA LOMBARDI MARIA INÊS S. LIMA Multidisciplinaria (Ciencias Naturales y Exactas) allelopathy Algal growth leaf extract secondary metabolites Annona glabra L. is a semi-deciduous tree that contains several active substances, including secondary metabolites, with antifungal activity. Phytopathogenic strains of the genus Pythium cause billion dollar losses all over the world on natural and crop species. Searching for eco-friendly algaecides and fungicides, we analyzed the effects of acetone extracts of A. glabra leaves on the algae Rhaphidocelis subcapitata (Korshikov) and on the oomycete Pythium aphanidermatum (Edson). We evaluated ten extract concentrations for each organism - 0 to 400 mg L -1 for algae and 0-1000 μg disc 1 for oomycete. The results showed no effect on algae up to 75 mg L -1 , but a significant inhibitory effect at 125 mg L -1 and above, which reduced the growth rate and the final biomass of the algae. Extract concentrations above 200 mg L -1 were completely inhibitory. The half maximal inhibitory concentration for 72 and 96 h of exposure to our crude extracts are comparable to those obtained with commercial fungicides and herbicides used in aquatic ecosystems. The P. aphanidermatum inhibition concentrations have effects comparable to fungicides as Cycloheximide and Bifonazole. Some substances isolated from the extracts are described as antifungals, which could explain part of anti-oomycete activity. Our results highlight the importance of searching bioactive compounds from plants. 2017 artículo científico 0001-3765 https://www.redalyc.org/articulo.oa?id=32753602013 en http://www.redalyc.org/revista.oa?id=327 Anais da Academia Brasileira de Ciências application/pdf Academia Brasileira de Ciências Anais da Academia Brasileira de Ciências (Brasil) Num.3 Vol.89