Fission yeast
| Fission yeast | ||||||||||||
|---|---|---|---|---|---|---|---|---|---|---|---|---|
Schizosaccharomyces pombe |
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| Systematics | ||||||||||||
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| Scientific name of the class | ||||||||||||
| Schizosaccharomycetes | ||||||||||||
| OE Erikss. & Winka | ||||||||||||
| Scientific name of the order | ||||||||||||
| Schizosaccharomycetales | ||||||||||||
| OE Erikss., Svedskog & Landvik | ||||||||||||
| Scientific name of the family | ||||||||||||
| Schizosaccharomycetaceae | ||||||||||||
| Beij. ex Klöcker | ||||||||||||
| Scientific name of the genus | ||||||||||||
| Schizosaccharomyces | ||||||||||||
| Lindner |
The fission yeasts ( Schizosaccharomyces ) are a systematically quite isolated genus of the hose fungi , which alone forms the class Schizosaccharomycetes . The species live as saprobionts in the sugary exudates of plants.
features
A mycelium is not formed or is poorly developed. No ascocarp is formed, nor any tissue between the asci . The vegetative cells are cylindrical and multiply by simple cell division, with two daughter cells of the same type being created. The name "fission yeast" comes from this type of cell division, since the other yeasts ( Saccharomycetes ) multiply by budding.
The sexual reproduction begins with the fusion of two vegetative cells to a ascus. This is followed by karyogamy and meiosis . The resulting four cell nuclei can divide one more time, so that in the end there are four or eight ascospores. After plasmogamy , however, the fissile yeast can also multiply as dikaryotic cells.
Systematics
The genus forms its own class within the Taphrinomycotina .
There are at least two dozen types: A selection:
- Schizosaccharomyces japonicus
- Schizosaccharomyces kambucha
- Schizosaccharomyces octosporus
- Schizosaccharomyces pombe
Individual evidence
- ^ Index Fungorum , accessed December 18, 2007.
literature
- Sina M. Adl et al .: The New Higher Level Classification of Eukaryotes with Emphasis on the Taxonomy of Protists. In: The Journal of Eukaryotic Microbiology. 52, 5, 2005, pp. 399-451. doi : 10.1111 / j.1550-7408.2005.00053.x .
