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Powders of Pithecellobium dulce leaves, fruit and seeds sequentially extracted with hexane-dicloromethane, acetone, and methanol-water were evaluated on mycelial growth of Alternaria sp., Botrytis cinerea, Colletotrichum gloeosporioides, Fusarium oxysporum, Penicillium digitatum, Pestalotiopsis sp. and Rhizopus stolonifer. In comparison to fruit and leaf powders, seeds had the highest fungistatic activity against the fungi tested. In general, a dose-effect curve was observed for the three concentrations (0.5, 2.0 and 5.0 mg/ml) evaluated. However, for P. digitatum and Alternaria sp., the lowest and highest concentrations respectively, increased mycelial growth. Depending on concentration, leaf and fruit powders inhibited or increased mycelial growth. For Pestalotiopsis sp.,P. digitatum, F. oxysporum, Alternaria sp., and R. stolonifer mycelial growth increased on seed residues (10 mg/ml), after hexane- dicloromethane, acetone, and methanol-water extractions of seed powder, suggesting that fungistatic compounds were removed by the dissolvent used. The hexane-dicloromethane extract was subjected to column chromatography, obtaining 13 fractions with similar pattern, which were evaluated using the mycelial growth responses of F. oxysporum, P. digitatum and R. stolonifer. Eleven and nine fractions inhibited F. oxysporum and R. stolonifer development, respectively. P. digitatum was the fungus least affected by all fractions. Preliminary analysis of the most active fraction by nuclear magnetic resonance indicated the presence of a tryacyl glycerol.

Palabras clave: Guamúchil, huamúchil, Madrasthorn, manila tamarind, ojiuma, extractos vegetales, fracciones, Alternaria sp., Botrytis cinerea, Colletotrichumgloeosporioides Fusarium oxysporum, Penicillium digitatum,Pestalotiopsis sp., Rhizopus stolonifer.
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Universidad Autónoma del Estado de México
Sistema de Información Científica Redalyc ®
Versión 3.0 | 2018
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