Identificación taxonómica de Aspergillus flavus en sistemas agroforestales (SAF) en el corregimiento número ocho (Zacarías rio Dagua) de Buenaventura D.E. - Valle del Cauca (Colombia).
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Resumen en español
La contaminación por Aspergillus flavus en productos agrícolas con importancia económica, es una preocupación para la salud humana, debido a la capacidad que tienen este hongo para la producción de metabolito secundario como lo son las aflatoxinas. No se logró encontrar algún reporte que indique que A. flavus es un patógeno para las plantas, sin embargo si logra causar problemas en las cosechas, poscosecha y en el almacenamiento de los productos agrícolas, a su vez como endófito se pueden concentrar como promotor de la resistencia a algún tipo de estrés biótico o abiótico, además de actuar como promotor de crecimiento debido que posee fitohormonas como (ABA, ácido giberélico (GA), IAA, ácido jasmónico (JA) y SA), la absorción de minerales y el aumento del contenido de lípidos, proteínas y carbohidratos. Este estudio se realizó en un sistema agroforestal ubicado en el corregimiento número ocho Zacarias rio Dagua de Buenaventura Valle del Cauca. Para la caracterización molecular en este estudio se obtuvieron un total de cuatro secuencias de ADN, en donde dos de ellas correspondiente al segmento ITS y las otras dos a β-tubulina, la similitud para ambos segmentos fue del 100,00% teniendo como secuencias de referencia de A. flavus en el segmento ITS; (KJ175411, MF324887 y KJ175412). Y para el segmento β-tubulina las secuencias de referencia fueron (KJ175476, EF203131 y MF324893), se destaca que en esta investigación se reporta por primera vez secuencias de A. flavus asociados a sistemas agroforestales. Contamination by Aspergillus flavus in economically important agricultural products is a concern for human health due to the ability of this fungus to produce secondary metabolites such as aflatoxins. We were unable to find any report indicating that A. flavus is a pathogen for plants, but it does cause problems in crops, postharvest and storage of agricultural products, and as an endophyte it can be concentrated as a promoter of resistance to some type of biotic or abiotic stress, in addition to acting as a growth promoter because it possesses phytohormones (ABA, gibberellic acid (GA), IAA, jasmonic acid (JA) and SA), mineral absorption and increased lipid, protein and carbohydrate content. This study was carried out in an agroforestry system located in the corregimiento number eight Zacarias, Dagua river, Buenaventura, Valle del Cauca. For the molecular characterization in this study a total of four DNA sequences were obtained, where two of them corresponding to the ITS segment and the other two to β-tubulin, the similarity for both segments was 100.00% having as reference sequences of A. flavus in the ITS segment; (KJ175411, MF324887 and KJ175412). And for the β-tubulin segment the reference sequences were (KJ175476, EF203131 and MF324893), it is noteworthy that this research reports for the first-time sequences of A. flavus associated with agroforestry systems.
Resumen en inglés
Contamination by Aspergillus flavus in economically important agricultural products is a concern for human health due to the ability of this fungus to produce secondary metabolites such as aflatoxins. We were unable to find any report indicating that A. flavus is a pathogen for plants, but it does cause problems in crops, postharvest and storage of agricultural products, and as an endophyte it can be concentrated as a promoter of resistance to some type of biotic or abiotic stress, in addition to acting as a growth promoter because it possesses phytohormones (ABA, gibberellic acid (GA), IAA, jasmonic acid (JA) and SA), mineral absorption and increased lipid, protein and carbohydrate content. This study was carried out in an agroforestry system located in the corregimiento number eight Zacarias, Dagua river, Buenaventura, Valle del Cauca. For the molecular characterization in this study a total of four DNA sequences were obtained, where two of them corresponding to the ITS segment and the other two to β-tubulin, the similarity for both segments was 100.00% having as reference sequences of A. flavus in the ITS segment; (KJ175411, MF324887 and KJ175412). And for the β-tubulin segment the reference sequences were (KJ175476, EF203131 and MF324893), it is noteworthy that this research reports for the firsttime sequences of A. flavus associated with agroforestry systems.