Chaetomium and chaetomium-like species from European indoor environments include Dichotomopilus finlandicus sp. nov.
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A1 Alkuperäisartikkeli tieteellisessä aikakauslehdessä
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Date
2021-09
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en
Pages
19
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Pathogens, Volume 10, issue 9
Abstract
The genus Chaetomium is a frequently occurring fungal taxon world-wide. Chaetomium and Chaetomium-like species occur in indoor environments, where they can degrade cellulose-based building materials, thereby causing structural damage. Furthermore, several species of this genus may also cause adverse effects on human health. The aims of this research were to identify Chaetomium and Chaetomium-like strains isolated from indoor environments in Hungary and Finland, two geographi-cally distant regions of Europe with drier and wetter continental climates, respectively, and to study their morphological and physiological properties, as well as their extracellular enzyme activities, thereby comparing the Chaetomium and Chaetomium-like species isolated from these two different regions of Europe and their properties. Chaetomium and Chaetomium-like strains were isolated from flats and offices in Hungary, as well as from schools, flats, and offices in Finland. Fragments of the translation elongation factor 1α (tef1α), the second largest subunit of RNA polymerase II (rpb2) and β-tubulin (tub2) genes, as well as the internal transcribed spacer (ITS) region of the ribosomal RNA gene cluster were sequenced, and phylogenetic analysis of the sequences performed. Morphological examinations were performed by stereomicroscopy and scanning electron microscopy. Thirty-one Chaetomium sp. strains (15 from Hungary and 16 from Finland) were examined during the study. The most abundant species was Ch. globosum in both countries. In Hungary, 13 strains were identified as Ch. globosum, 1 as Ch. cochliodes, and 1 as Ch. interruptum. In Finland, 10 strains were Ch. globosum, 2 strains were Ch. cochliodes, 2 were Ch. rectangulare, and 2 isolates (SZMC 26527, SZMC 26529) proved to be representatives of a yet undescribed phylogenetic species from the closely related genus Dichotomopilus, which we formally describe here as the new species Dichotomopilus finlandicus. Growth of the isolates was examined at different temperatures (4, 15, 20, 25, 30, 37, 35, 40, and 45◦ C), while their extracellular enzyme production was determined spectrophotometrically.Description
Funding Information: Funding: O.K. was supported by the ÚNKP-20-3—New National Excellence Program of the Ministry for Innovation and Technology from the source of the National Research, Development and Innovation Fund. M.A.A., H.S. and R.M. are grateful to the Academy of Finland (CleanSchool-project, grant no. 330150) for financial support. Publisher Copyright: © 2021 by the authors. Licensee MDPI, Basel, Switzerland.
Keywords
Chaetomium, Dichotomopilus, Extracellular enzymes, Indoor environment
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Citation
Kedves, O, Kocsubé, S, Bata, T, Andersson, M A, Salo, J M, Mikkola, R, Salonen, H, Szűcs, A, Kedves, A, Kónya, Z, Vágvölgyi, C, Magyar, D & Kredics, L 2021, ' Chaetomium and chaetomium-like species from European indoor environments include Dichotomopilus finlandicus sp. nov. ', Pathogens, vol. 10, no. 9, 1133 . https://doi.org/10.3390/pathogens10091133