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| Titel |
Spores of many common airborne fungi reveal no ice nucleation activity in oil immersion freezing experiments |
| VerfasserIn |
B. G. Pummer, L. Atanasova, H. Bauer, J. Bernardi, I. S. Druzhinina, J. Fröhlich-Nowoisky, H. Grothe |
| Medientyp |
Artikel
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| Sprache |
Englisch
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| ISSN |
1726-4170
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| Digitales Dokument |
URL |
| Erschienen |
In: Biogeosciences ; 10, no. 12 ; Nr. 10, no. 12 (2013-12-10), S.8083-8091 |
| Datensatznummer |
250085467
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| Publikation (Nr.) |
 copernicus.org/bg-10-8083-2013.pdf |
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| Zusammenfassung |
Fungal spores are ubiquitous biological aerosols, which are considered to act
as ice nuclei. In this study the ice nucleation (IN) activity of spores
harvested from 29 fungal strains belonging to 21 different species was tested
in the immersion freezing mode by microscopic observation of water-in-oil
emulsions. Spores of 8 of these strains were also investigated in a
microdroplet freezing array instrument. The focus was laid on species of
economical, ecological or sanitary significance. Besides common molds
(Ascomycota), some representatives of the widespread group of mushrooms
(Basidiomycota) were also investigated.
Fusarium avenaceum was the only sample showing IN activity at
relatively high temperatures (about 264 K), while the other investigated
fungal spores showed no freezing above 248 K. Many of the samples indeed
froze at homogeneous ice nucleation temperatures (about 237 K). In
combination with other studies, this suggests that only a limited number of
species may act as atmospheric ice nuclei. This would be analogous to what is
already known for the bacterial ice nuclei.
Apart from that, we selected a set of fungal strains from different sites and
exposed them to occasional freezing stress during their cultivation. This was
in order to test if the exposure to a cold environment encourages the
expression of ice nuclei during growth as a way of adaptation. Although the
total protein expression was altered by this treatment, it had no significant
impact on the IN activity. |
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