Tolerancia de Aspergillus flavus y Aspergillus nidulans a metales tóxicos

Translated title of the contribution: Toxic metal tolerance of Aspergillus flavus and Aspergillus nidulans isolated from tailings

Ana G. Villalba-Villalba*, Lerma H. Chan-Chan, Amir Maldonado-Arce

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

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.

Translated title of the contributionToxic metal tolerance of Aspergillus flavus and Aspergillus nidulans isolated from tailings
Original languageSpanish
Pages (from-to)189-205
Number of pages17
JournalRevista Chapingo, Serie Ciencias Forestales y del Ambiente
Volume28
Issue number2
DOIs
StatePublished - May 2022
Externally publishedYes

Bibliographical note

Funding Information:
The authors thank the Transmission Electron Microscopy Laboratory of the Universidad de Sonora for the facilities provided for energy dispersive spectroscopy (EDS) analyses.

Publisher Copyright:
© 2022 Universidad Autonoma Chapingo. All rights reserved.

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