Black yeast habitat choices and species spectrum on high altitude creosote-treated railway ties

Aylin Döğen, Macit Ilkit, G Sybren de Hoog

    Research output: Contribution to journal/periodicalArticleScientificpeer-review

    28 Citations (Scopus)

    Abstract

    Polyextremotolerant black yeast-like fungi thrive in moderately hostile environments where they are concomitantly subjected to several types of stress, such as toxicity, scarce nutrient availability, and high or low temperature extremes. Their ability to assimilate alkylbenzenes (toxic environmental pollutants) enhances their growth in harsh conditions, including on railway ties. Samples were collected using cotton swabs, premoistened with physiological saline, from 658 oak and concrete railway ties at six train stations in Turkey at altitudes ranging between 1026 and 1427 m. The samples were inoculated on malt extract agar supplemented with chloramphenicol, and incubated at 26 °C for 4 weeks. Twenty-four samples (3.6 %), 17 from oak and 7 from concrete (5.6 % vs. 2 %; P = 0.02), tested positive for fungi. Exophiala crusticola was found to be the most common species (n = 13), followed by Exophiala phaeomuriformis (n = 7) and Exophiala heteromorpha (n = 4). These results suggest that hydrocarbons, particularly creosote-treated oak woods, support the growth of black yeasts, some of which are opportunists in humans.

    Original languageEnglish
    Pages (from-to)692-6
    Number of pages5
    JournalFungal Biology
    Volume117
    Issue number10
    DOIs
    Publication statusPublished - Oct 2013

    Keywords

    • Altitude
    • Cluster Analysis
    • DNA, Fungal
    • DNA, Ribosomal Spacer
    • Ecosystem
    • Environmental Microbiology
    • Microbiological Techniques
    • Molecular Sequence Data
    • Phylogeny
    • Sequence Analysis, DNA
    • Turkey
    • Yeasts

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