Yeasts from the Maritime Antarctic: tools for industry and bioremediation
Abstract We isolated 32 yeasts from King George Island, which we then identified and characterized. Twenty-six belonged to Basidiomycota among the genera Naganishia , Holtermaniella , Vishniacozyma , Phenoliferia , Mrakia and Cystobasidium , and only six were Ascomycota of the genera Metschnikowia a...
Published in: | Antarctic Science |
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Main Authors: | , , , , |
Other Authors: | |
Format: | Article in Journal/Newspaper |
Language: | English |
Published: |
Cambridge University Press (CUP)
2021
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Subjects: | |
Online Access: | http://dx.doi.org/10.1017/s0954102021000420 https://www.cambridge.org/core/services/aop-cambridge-core/content/view/S0954102021000420 |
Summary: | Abstract We isolated 32 yeasts from King George Island, which we then identified and characterized. Twenty-six belonged to Basidiomycota among the genera Naganishia , Holtermaniella , Vishniacozyma , Phenoliferia , Mrakia and Cystobasidium , and only six were Ascomycota of the genera Metschnikowia and Debaryomyces . Thirteen were psychrophiles, while 19 were psychrotolerant. Certain isolates exhibited a high tolerance to NaCl (3.5 M), while most tolerated Ni 2+ , Zn 2+ and Li + . Cu 2+ and Cd 2+ , however, inhibited the growth of most of the isolates. We assessed a bioprospecting of extracellular enzymes and their ability to biodegrade or bioaccumulate textile dyes. β-Glucosidases (59%) and esterases (53%) were the main extracellular enzymes detected. A minor proportion of the yeasts produced pectinases and xylanases; only psychrophiles produced proteases. Vishniacozyma , Naganishia , Phenoliferia and Mrakia were the richest genera in terms of enzyme production. Greater than 70% of the isolates decolourized solid medium supplemented with various dyes at 4°C and 20°C. Isolates belonging to the genera Vishniacozyma , Cystobasidium , Mrakia and Phenoliferia seem to have potential for textile dye bio-decolourization. The results demonstrated that yeasts collected from the Maritime Antarctic are a potential source of new enzymes of biotechnological interest, and that certain isolates could potentially be considered in the design of textile wastewater decolourizations. |
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