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Evaluation of Resin Content and the Antifungal Effect of Larrea tridentata (Sesse and Moc. Ex D.C.) Coville Extracts from Two Mexican Deserts Against Pythium sp. Pringsh
Ricardo Hugo Lira Saldívar, Gloria Franciela Balvantín García, Francisco Daniel Hernández Castillo, Roberto Gamboa Alvarado, Diana Jasso de Rodríguez, Florencio Jiménez Díaz;
Revista Mexicana de Fitopatología 2003 21(2)
Resumen
Inglés Español
The antifungal effect of Larrea tridentata extracts, a plant locally known as “gobernadora or creosote bush” from northern Mexico, was investigated using fungal inhibition bioassays at 0, 500, 1000, 2000, 4000, 6000, and 8000 µl l-1. Samples of L. tridentata were collected from Coahuila and Zacatecas states in the Chihuahuan Desert (ChD), and from South Baja California state in the Sonoran Desert (SD). Resin from leaves and small twigs was extracted with methanol, ethanol, and chloroform. Results showed that the overall resin mean value for samples collected in the ChD was 22.6% whereas, those from the SD was 25.49%. Mycelial growth of the phytopathogen Pythium sp. was completely inhibited with the extracts evaluated. The fungicidal effect of gobernadora extracts was consistent in spite of the solvent used for extraction or location of sampling sites. Methanolic extracts from both deserts had a notable effect at relatively low doses (500 µl l-1), where fungal growth in vitro did not occur. The overall results indicate that resin extracts from the SD were superior in its inhibitory effect than those from the ChD. L. tridentata extracts could be of practical use as antifungal compounds with low impact on the environment with important industrial possibilities. Additional studies under greenhouse and field conditions are required, before the development of new agricultural based organic fungicides and other Larrea-based agrochemicals.

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Universidad Autónoma del Estado de México
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