Abstract
Heavy metal contamination represents an important environmental issue due to the toxic effects of metals on different organisms. Filamentous fungi play an important impact in the bioremediation of heavy metal-contaminated wastewater and soil. The purpose of this investigation was to observe fungal uptake behavior toward heavy metal. For this aim Trichoderma asperellum TS141 and T. harzianum TS103 at growth period were screened for their tolerance and uptake capability of cadmium (Cd), lead (Pb) and nickel (Ni) at different concentrations (0, 25, 50, 100, and 200 mg/L) in PDB media (potato dextrose broth as a complex medium). Results showed that both fungi were able to survive at the maximum concentration of 200 mg/L of the heavy metals, and remove them. T. asperellum had a better uptake capacity for Cd compared to Pb and Ni in the highest metal concentration in media. Maximum removal efficiency of Pb (68.4%) at 100 mg/L and Ni (78%) at 200 mg/L was performed by T. asperellum. For Cd, the highest removal efficiency (82.1%) was recorded by T. harzianum at 200 mg/L Cd in aqueous solution. The uptake of Cd was highly dependent on pH of solution than Pb and Ni so that the optimal pH of Cd uptake was 9 for T. asperellum and 4 for T. harzianum. Also, optimal temperature was 35°C for Cd and Pb uptake in both fungi, whereas for Ni uptake was 30 and 35°C in T. harzianum and T. asperellum, respectively. We propose that T. asperellum TS141 and T. harzianum TS103 can be used as a bioremediation agent for metal remediation from wastewater and heavy metal-contaminated soils.
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Hoseinzadeh, S., Shahabivand, S. & Aliloo, A.A. Toxic metals accumulation in Trichoderma asperellum and T. harzianum. Microbiology 86, 728–736 (2017). https://doi.org/10.1134/S0026261717060066
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DOI: https://doi.org/10.1134/S0026261717060066