ResumenEl presente trabajo informa la detección, por métodos bioquímicos, de enzimas extracelulares relacionadas con la actividad biológica de nueve cepas del complejo Metarhizium anisopliae (Metsch.) Sorokin. Se determinó, a diferentes concentraciones, la capacidad patogénica contra el insecto Cylas formicarius Fabricius, y se calculó el tiempo y la concentración letal. Se analizó tanto la presencia de enzimas extracelulares en las cepas fúngicas como su relación con el efecto entomopatogénico y virulencia contra C. formicarius. Todas las cepas del complejo M. anisopliae estudiadas resultaron patogénicas exhibiendo un índice de actividad enzimática superior a 1. La cepa LBM-30 fue la más eficiente al detectarse la presencia de enzimas proteasa, quitinasa, caseínasa, amilasa y lipasa. Esto corrobora la relación de la actividad enzimática con la virulencia observada.Palabras clave: actividad patogénica, actividad enzimática, control biológico, coleóptero, hongos entomopatógenos, virulencia AbstractThis study reports the detection, by biochemical methods, of extracellular enzymes related to the biological activity of nine strains of the complex Metarhizium anisopliae (Metsch.) Sorokin. We determined the pathogenic capacity against the insect Cylas formicarius Fabricius at different concentrations, calculated the lethal time and concentration, and analyzed both the presence of extracellular enzymes in the fungal strains as well as their relation to the entomopathogenic effect and virulence against C. formicarius. All strains of the M. anisopliae complex studied were pathogenic with an enzymatic activity index greater than 1. The LBM-30 strain was the most effective with presence of protease, chitinase, caseinase, amylase and lipase enzymes. This result corroborates the relationship between of the enzymatic activity with the observed virulence.
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