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Stud Mycol 61(1): 157-163 2008
DOI: 10.3114/sim.2008.61.16
Copyright © 2008 CBS Fungal Biodiversity Centre
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Selective factors involved in oil flotation isolation of black yeasts from the environment

M.M. Satow1, D. Attili-Angelis1,*, G.S. de Hoog2, D.F. Angelis1 and V.A. Vicente3

1 Department of Biochemistry and Microbiology, Institute of Biological Science, São Paulo State University Júlio de Mesquita Filho - UNESP, Rio Claro, SP, Brazil
2 CBS Fungal Biodiversity Centre, P.O. Box 85167, NL-3508 AD Utrecht, The Netherlands
3 Division of Basic Pathology, Department of Pathology, Federal University of Paraná, Curitiba, PR, Brazil

* Correspondence: Derlene Attili-Angelis, de{at}afa.inf.br

The oil flotation isolation technique has been successfully applied to recover chaetothyrialean black yeasts and relatives from the environment. The selective mechanisms playing a role in isolation are unknown. The fungi concerned are supposed to occupy specialized microniches in nature, taking advantage of (1) oligotrophism. Mineral oil as a main selective agent may be based on (2) hydrophobicity or on (3) assimilation. All three hypotheses are tested in this paper. Results show that cell wall hydrophobicity is unlikely to be a selective factor. Incubation under poor nutrient conditions provides competitive advantage for black yeasts, especially for Exophiala strains, which are subsequently enriched by mineral oil which enhances growth in this group of fungi. Incubation under mineral media and mineral oil can be used as selective factor.

Keywords Black yeasts / oil flotation / polluted soil / selective isolation




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