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Revista Chapingo serie ciencias forestales y del ambiente
versión On-line ISSN 2007-4018versión impresa ISSN 2007-3828
Resumen
VILLALBA-VILLALBA, Ana G.; CHAN-CHAN, Lerma H. y MALDONADO-ARCE, Amir. Toxic metal tolerance of Aspergillus flavus and Aspergillus nidulans isolated from tailings. Rev. Chapingo ser. cienc. for. ambient [online]. 2022, vol.28, n.2, pp.189-205. Epub 16-Feb-2024. ISSN 2007-4018. https://doi.org/10.5154/r.rchscfa.2021.02.009.
Introduction:
Metals are found naturally in the environment, but their indiscriminate use has caused serious pollution problems.
Objective:
Two species of Aspergillus were isolated and identified from tailings, then their tolerance index at different concentrations of several metals was evaluated.
Materials and methods:
Fungi were isolated from tailings located in the Sonoran Desert. Fungal growth was evaluated in the presence of Cr6+, Pb2+, Zn2+, Ag+, Cd2+, Cu2+ and Hg2+ metals using the tolerance index and minimum inhibitory concentration (MIC).
Results and discussion:
A. flavus had very high tolerance indices to Cr6+, Pb2+ and Zn2+ at all concentrations evaluated (≥20 mM); it also had a high tolerance index to the other metals at lower concentrations. The MIC for this fungus in the presence of Cd2+, Hg2+ and Ag+ was recorded between 5 and 10 mM. The growth of A. nidulans was not inhibited with 20 mM of Cr6+. The MIC of A. nidulans in presence of Hg2+, Ag+ and Cu2+ is in the range 1-5 mM; with Cd2+, Pb2+ and Zn2+ it is in the range between 15 and 20 mM. The dose-response curves display a characteristic sigmoidal shape. With Ag+ and Cu2+ A. flavus displayed a hermetic behavior.
Conclusion:
High metal tolerance of these fungi suggests their potential use in the removal of metals.
Palabras llave : Sonoran Desert; contamination of soil; metal toxicity; mining; filamentous fungi.