Fungitoxic Potential of Extracts of Four Pinus spp. Bark to Inhibit Fungus Trametes versicolor (L. ex. Fr.) Pilát

María Guadalupe Lomelí-Ramírez, Haydeé Dávila-Soto, José Antonio Silva-Guzmán, Héctor Guillermo Ochoa-Ruíz, Salvador García-Enriquez


Antifungal potential of bark crude extracts of Pinus strobus L., Pinus douglasiana Martinez, Pinus caribaea Morelet [var. Hondurensis (scheclauze) W. H. G. Barrett & Golfari] and Pinus leiophylla Schltdl. & Cham, for inhibiting mycelial growth to fungus Trametes versicolor (L. ex Fr.) Pilát was investigated. Pinus bark was extracted through a mixture of acetone-hexane-water 54:44:2 V. Bioassays were performed according to the agar dilution method (petri dish) using concentrations of 0.1, 0.5, and 1.0 mg mL-1 for each of the obtained extracts. All extracts showed some inhibition degree. Crude extracts of P. strobus bark showed the greatest inhibition degree. Antifungal potential of all tested extracts at a concentration of 1.0 mg mL-1 was classified as toxic. Through simple regression models, concentrations were calculated in order to achieve a 50% inhibition (IC50) and the minimal inhibition concentration (MIC). MIC values were 1.58, 1.72, 1.24, and 1.94 mg mL-1 for bark extracts of P. strobus, P. douglasiana, P. caribaea, and P. leiophylla, respectively.


Antifungal potential; Bark extracts; Pine bark; Trametes versicolor

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