Abstract
This study characterized cultivable fungi present in sediments obtained from Boeckella Lake, Hope Bay, in the north-east of the Antarctic Peninsula, and evaluated their production of enzymes and biosurfactants of potential industrial interest. A total of 116 fungal isolates were obtained, which were classified into 16 genera within the phyla Ascomycota, Basidiomycota and Mortierellomycota, in rank. The most abundant genera of filamentous fungi included Pseudogymnoascus, Pseudeurotium and Antarctomyces; for yeasts, Thelebolales and Naganishia taxa were dominant. Overall, the lake sediments exhibited high fungal diversity and moderate richness and dominance. The enzymes esterase, cellulase and protease were the most abundantly produced by these fungi. Ramgea cf. ozimecii, Holtermanniella wattica, Leucosporidium creatinivorum, Leucosporidium sp., Mrakia blollopis, Naganishia sp. and Phenoliferia sp. displayed enzymatic index > 2. Fourteen isolates of filamentous fungi demonstrated an Emulsification Index 24% (EI24%) ≥ 50%; among them, three isolates of A. psychrotrophicus showed an EI24% > 80%. Boeckella Lake itself is in the process of drying out due to the impact of regional climate change, and may be lost completely in approaching decades, therefore hosts a threatened community of cultivable fungi that produce important biomolecules with potential application in biotechnological processes.
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Data availability
All fungal culture studied in this article are stored in the Laboratory of Microbiology at Universidade Federal de Minas Gerais. The fungal DNA sequences are deposited in the GenBank database.
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This study received financial support from CNPq, PROANTAR, FAPEMIG and CAPES. J.M. Lirio and S.H. Coria were supported by Instituto Antártico Argentino. P. Convey is supported by NERC core funding to the British Antarctic Survey’s ‘Biodiversity, Evolution and Adaptation’ Team.
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EAAT, LDS, RV, RV, JML, SHC and LHR conceived the study. EAAT, LDS, RV, RV, JML, SHC, PC, CAR and LHR analyzed the results and wrote the manuscript. All authors read and approved the final manuscript.
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Teixeira, E.A.A., de Souza, L.M.D., Vieira, R. et al. Enzymes and biosurfactants of industrial interest produced by culturable fungi present in sediments of Boeckella Lake, Hope Bay, north-east Antarctic Peninsula. Extremophiles 28, 30 (2024). https://doi.org/10.1007/s00792-024-01345-3
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DOI: https://doi.org/10.1007/s00792-024-01345-3