Physiological response of Trichoderma spp. (Ascomycota, Hypocreales) to the pesticide chlorpyrifos
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Bioremediation, environmental biotechnology, organophosphate degradationAbstract
Chlorpyrifos (CP) is a chlorinated organophosphate pesticide widely used in agricultural crops, characterized by its environmental persistence and toxic effects on flora and fauna. The treatment of CP-contaminated soils aims to reduce contaminant concentrations; to this end, the use
of microorganisms represents a sustainable and economical alternative compared to physicochemical methods. Among filamentous fungi with potential for this purpose, the genus Trichoderma stands out due to its genetic diversity, ecological plasticity, high enzymatic capacity for degrading of complex compounds, versatile metabolism, and resistance to microbial inhibitors. The objective of this study was to evaluate the physiological responses of 11 native Trichoderma strains, isolated from soils of the Quebrada and Puna regions of Jujuy Province, to CP
exposure, and to determine their ability to degrade it under controlled laboratory conditions. For this purpose, the strains were exposed to contaminated media with 200 mg/L of CP, and variables such as mycelial growth, growth rate, percentage of mycelial growth inhibition, conidia production, and percentage of CP removal were measured. The results showed that the strains tolerated the presence of CP without significant effects on their growth or on the production of reproductive structures, and some exhibited increased sporulation, which could represent
an adaptive response to chemical stress. Differences in CP removal
efficiency were observed among strains, with several reaching removal rates exceeding 90%. These results demonstrat the potential of native Trichoderma strains for application in bioremediation strategies in CPcontaminated soils.
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