Место издания:European Mycological Association Madeira, Portugal
Первая страница:44
Последняя страница:44
Аннотация:This is a first report on the mycobiota of the Chukchi Sea, one of the most inclement seas
of the world. Twenty‐two bottom sediment samples were taken at depths ranging from
44 to 110 meters. Fungi were isolated by Warcup's technique using MEA (salinity 35 ‰).
Fungal cultures were identified using both cultural methods and ITS1‐5.8S‐ITS2
sequencing data. The effects of different environmental parameters (temperature,
salinity and C sources) on the spore germination and the colony growth rate were
examined. The fungal abundance in the analyzed samples was low: in total, as little as 150
fungal strains were isolated from all samples; the number of fungal isolates obtained from
1g individual bottom sediment samples varied from zero to 22. At the same time the
fungal diversity was unexpectedly high: we identified 49 morphotypes belonging to 32
genera of Basidiomycota (4 genera, 4 species) and Ascomycota (all the others). Among
almost forty non‐sporulating cultures initially isolated the majority were identified as
Ascomycota, and two – as Basidiomycota species based on DNA sequence data. Most of
Ascomycota species in this study were referred to Eurotiales, Pleosporales, Helotiales and
Hypocreales; fungi of Eurotiales family were most abundant in all samples examined (41%
of all isolates). In experiments with growth and conidial germination all isolated fungi
exhibited broad salinity tolerance ranging from 0 to 50‰ and the ability to grow using
algal‐specific polysaccharides as a sole carbon source. The major growth‐limiting factors
were low temperature and the lack of available organic matter.