Dikarya
Dikarya is a subkingdom of Fungi that includes the divisions Ascomycota and Basidiomycota, both of which in general produce dikaryons, may be filamentous or unicellular, but are always without flagella.
The Dikarya are most of the so-called "higher fungi", but also include many anamorphic species that would have been classified as molds in historical literature.Phylogenetically the two divisions regularly group together. In a 1998 publication, Thomas Cavalier-Smith referred to this group as the Neomycota.
| Dikarya | |
|---|---|
 | |
| Diversity of Basidiomycota clockwise from top-left, which includes fly-agaric (Amanita muscaria), Dacrymyces palmatus, Clathrus ruber, porcini (Boletus edulis), Exobasidium vaccinii, bamboo mushroom (Phallus indusiatus), and Meredithblackwellia eburnea | |
 | |
| Diversity of Ascomycota clockwise from top-left, which includes common morel (Morchella esculenta), Neolecta vitellina, black truffle (Tuber melanosporum), Sarcoscypha austriaca, Penicillium, Rhizocarpon, fission yeast (Schizosaccharomyces pombe), and Microsporum canis | |
Scientific classification  | |
| Domain: | Eukaryota |
| Kingdom: | Fungi |
| Clade: | Symbiomycota |
| Subkingdom: | Dikarya Hibbett, T.Y.James & Vilgalys (2007) |
| Divisions | |
| Ascomycota | |
| Synonyms | |
| Carpomycetaceae Bessey (1907) | |
Phylogeny
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| Phylogeny of the Dikarya and upper-level taxa in Kingdom Fungi. |
The 2007 classification of Kingdom Fungi is the result of a large-scale collaborative research effort involving dozens of mycologists and other scientists working on fungal taxonomy. It recognizes seven divisions within the Fungi, two of which—the Ascomycota and the Basidiomycota—are contained within a branch representing subkingdom Dikarya. The cladogram depicts the major fungal taxa and their relationship to opisthokont and unikont organisms. The lengths of the branches in this tree are not proportional to evolutionary distances.
Sexual reproduction
Ascomycota
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The phylum Ascomycota, or sac fungus, is characterized by formation of meiotic spores called ascospores enclosed in a special sac called an ascus. The genetic components for sexual reproduction appear to be produced by all members of this group.
Basidiomycota
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The phylum Basidiomycota can be divided into three major lineages: mushrooms, rusts and smuts. Fusion of haploid nuclei (karyogamy) occurs in the basidia, club-shaped end cells. Shortly after formation of the diploid cell, meiosis occurs and the resulting four haploid nuclei migrate into four, usually external cells called basidiospores.
Adaptive function
Sexual reproduction has been proposed to have evolved in both the Ascomycota and Basidiomycota as an adaptation for repair of DNA damage via homologous recombination under stressful conditions.
See also
References
External links
- AFTOL classification at Dave Hibbett's site Archived 2021-04-23 at the Wayback Machine
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