Background: Selenium (Se) pollution poses serious threats to terrestrial ecosystems. Mushrooms are important sources of Se with the potential for bioremediation. Pre-eminent Se resources must possess the ability to tolerate high levels of Se. To obtain Se-accumulating fungi, we isolated selenite-tolerance-enhanced JNUSE-200 through adaptive evolution.
Methods: The molecular mechanism responsible for selenite tolerance and accumulation was explored in JNUSE-200 by comparing it with the original strain, CGMCC 5.26, using a combination of physiological and transcriptomic approaches.
Results: JNUSE-200 demonstrated tolerance to 200 mg/kg selenite in liquid culture and exhibited normal growth, whereas CGMCC 5.26 experienced reduced growth, red coloration, and an unpleasant odor as a result of exposure to selenite at the same concentration. In this study, JNUSE-200 developed a triple defense mechanism against high-level selenite toxicity, and the key genes responsible for improved selenite tolerance were identified.
Conclusions: The present study offers novel insights into the molecular responses of fungi towards selenite, providing theoretical guidance for the breeding and cultivation of Se-accumulating varieties. Moreover, it significantly enhances the capacity of the bio-manufacturing industry and contributes to the development of beneficial applications in environmental biotechnology through fungal selenite transformation bioprocesses.
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| http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11205109 | PMC |
| http://dx.doi.org/10.3390/jof10060415 | DOI Listing |
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