Abstract
Microcosm assays with dye-amended culture media under a shot-feeding strategy allowed us to obtain 100 yeast isolates from the wastewater outfall channel of a dyeing textile factory in Tucumán (Argentina). Meanwhile, 63 yeast isolates were obtained from Phoebe porphyria (Laurel del monte) samples collected from Las Yungas rainforest (Tucumán), via a classical isolation scheme. Isolated yeasts, both from dye-polluted and virgin environments, were compared for their textile dye decolourization ability when cultured on solid and liquid media. Nine isolates from wastewater and 17 from Las Yungas showed the highest decolourization potential on agar plates containing six different reactive dyes, either alone or as a mixture. Five yeasts from each environment were further selected on the basis of their high dye removal rate in Vilmafix® Red 7B-HE- or Vilmafix® Blue RR-BB-amended liquid cultures. Yeasts from wastewater showed slightly higher decolourization percentages after 36 h of culture than yeasts from Las Yungas (98–100% vs. 91–95%, respectively). However, isolates from Las Yungas exhibited higher specific decolourization rates than isolates from effluents (1.8–3.0 vs. 0.9–1.3 mg g−1h−1, respectively). All selected isolates were first grouped according to microsatellite-PCR analysis and representative isolates from each group were subsequently identified based on the 26S rRNA gene sequence analysis. Yeasts from wastewater were identified as the ascomycetous Pichia kudriavzevii (100%) and closely related to Candida sorbophila (99.8%), whilst yeasts from Las Yungas were identified as the basidiomycetous Trichosporon akiyoshidainum and Trichosporon multisporum. It is suggested that findings concerning yeast selection during screening programs for dye-decolourizing yeasts may be explained in the light of the copiotroph-oligotroph microorganisms rationale.
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Abbreviations
- WRF:
-
White rot fungi
- NDM:
-
Normal decolourization medium
- HAU:
-
Halo arbitrary units
- CDAU:
-
Colony dying arbitrary units
- LiP:
-
Lignin peroxidase
- Lacc:
-
Laccase
- MnP:
-
Manganese dependent peroxidase
- ABTS:
-
2,2′-azino-bis(3-ethylbenzothiazoline-6-sulphonic acid)
- TMPD:
-
N,N,N′,N′-tetramethyl-p-phenylenediamine
- YCB:
-
Yeast carbon base
- YNB:
-
Yeast nitrogen base
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Acknowledgments
Thanks are due to Dr. W. J. Middelhoven for advice concerning Trichosporon identification. This work was supported by Agencia Nacional de Promoción Científica y Tecnológica-FONCYT (PICT2003-14496), Consejo Nacional de Investigaciones Científicas y Técnicas, CONICET (PIP 6202), and Consejo de Investigaciones de la Universidad Nacional de Tucumán, CIUNT (D-311).
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Pajot, H.F., Delgado, O.D., de Figueroa, L.I.C. et al. Unraveling the decolourizing ability of yeast isolates from dye-polluted and virgin environments: an ecological and taxonomical overview. Antonie van Leeuwenhoek 99, 443–456 (2011). https://doi.org/10.1007/s10482-010-9495-4
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DOI: https://doi.org/10.1007/s10482-010-9495-4