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Molecular characterization of carotenogenic yeasts from aquatic environments in Patagonia, Argentina.
- Source :
-
Antonie van Leeuwenhoek [Antonie Van Leeuwenhoek] 2003; Vol. 84 (4), pp. 313-22. - Publication Year :
- 2003
-
Abstract
- Fifteen aquatic environments (lakes, lagoons and rivers) of glacial origin in the northern Andean Patagonia (Argentina) were surveyed for the occurrence of red yeasts. Subsurface water samples were filtered and used for colony counting and yeast isolation. A preliminary quantitative analysis indicated that total yeast counts ranged between 0 and 250 cells l(-1). A polyphasic approach including physiological and molecular methods was used for the identification of 64 carotenogenic yeast strains. The molecular characterisation of the isolates was based on the mini/microsatellite-primed PCR technique (MSP-PCR) employing the (GTG)5 and the M13 primers. Comparison of representative fingerprints of each group with those of the type strains of pigmented yeasts allowed the expeditious identification of 87.5% isolates. The sequence analysis of the D1/D2 domains of the 26S rDNA was employed to confirm identifications and in the characterization of the unidentified MSP-PCR groups. Teleomorphic yeast species were detected by performing sexual compatibility assays. The isolates corresponded to 6 genera and 15 yeast species, including four new yeast species of the genera Cryptococcus (1), Rhodotorula (1) and Sporobolomyces (2). Rhodotorula mucilaginosa was found in the majority of the samples and represented ca. 50% of the total number of isolates. However, this yeast was not detected in aquatic environments with very low anthropic influence. Other frequent yeast isolates were teleomorphic yeast species of Rhodosporidium babjevae, R. kratochvilovae and Sporidiobolus salmonicolor. This study represents the first report on red yeast occurrence and biodiversity in northwestern Patagonia.
- Subjects :
- Argentina
Basidiomycota classification
Basidiomycota growth & development
Basidiomycota isolation & purification
Basidiomycota metabolism
DNA Fingerprinting methods
DNA, Fungal isolation & purification
DNA, Ribosomal chemistry
Microsatellite Repeats genetics
Phylogeny
Polymerase Chain Reaction
RNA, Ribosomal genetics
Sequence Analysis, DNA
Yeasts growth & development
Yeasts metabolism
Pigments, Biological biosynthesis
Water Microbiology
Yeasts classification
Yeasts isolation & purification
Subjects
Details
- Language :
- English
- ISSN :
- 0003-6072
- Volume :
- 84
- Issue :
- 4
- Database :
- MEDLINE
- Journal :
- Antonie van Leeuwenhoek
- Publication Type :
- Academic Journal
- Accession number :
- 14574108
- Full Text :
- https://doi.org/10.1023/a:1026058116545