Abstract
Mycoremediation, a subset of bioremediation, is considered an advanced method to eliminate environmental contaminations. To identify tolerant fungi to copper contamination and study the related gene expression, sampling was carried out from the soil of “Sarcheshmeh Copper Mine,” which is one of the biggest open-cast copper mines in the world. A total of 71 fungal isolates were obtained and purified. Afterward, the inhibitory effect of different concentrations (1000, 1500, 3500, 4000, and 5500 ppm) of copper sulfate on mycelial growth was evaluated. Results indicated that only 5500 ppm of copper sulfate inhibited fungal growth compared to the control. Based on the bioassay experiments, three isolates including S3-1, S3-21, and S1-7, which were able to grow on solid and broth medium containing 5500 ppm of copper sulfate at different pH conditions, were selected and identified using molecular approaches. Also, laccase and metallothionein gene expression has been assessed in these isolates. According to the molecular identification using ITS1-5.8S- ITS2 region, isolates S3-1 and S1-7 were identified as Pleurotus eryngii, and isolate S3-21 belonged to the genus Sarocladium. In addition, P. eryngii showed laccase gene expression reduction after 8 days of exposure to copper sulfate. While in the genus Sarocladium, it increased (almost 2 times) from 6 to 8 days. Besides, metallothionein gene expression has increased from 6 to 8 days of copper sulfate treatment compared to the control which reveals its role in copper tolerance of all studied isolates. In this study, Pleurotus eryngii and Sarocladium sp. are introduced as heavy metal tolerant fungi and the related gene expression to copper tolerance was studied for the first time in Iran.
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Ferdos Ganji: investigation, visualization, writing — original draft Shideh Mojerlou: conceptualization, supervision, methodology, formal analysis, writing — review and editing Naser Safaie: conceptualization, supervision, methodology, data curation, writing — review and editing.
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Ganji, F., Mojerlou, S. & Safaie, N. Evaluation of copper-tolerant fungi isolated from Sarcheshmeh copper mine of Iran. Environ Sci Pollut Res 30, 110715–110724 (2023). https://doi.org/10.1007/s11356-023-30135-1
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DOI: https://doi.org/10.1007/s11356-023-30135-1