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  • Apomixis  (1)
  • Nematospora  (1)
  • 1
    Digitale Medien
    Digitale Medien
    Genetische Untersuchungen zur Fruchtkörper- und Artbildung bei Basidiomyceten: Genetische Kontrolle der Fruchtkörperbildung beiPolyporus ciliatus (1983)
    Springer
    Plant systematics and evolution 141 (1983), S. 341-371 
    Details
    ISSN: 1615-6110
    Schlagwort(e): Basidiomycetes ; Polyporus ciliatus ; Fruiting ; Genetic control ; Breeding ; Sexuality ; Apomixis ; Speciation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Using mainly the basidiomycetePolyporus ciliatus, we were able to produce fully developed fruitbodies not only in the normal meiotic cycle (teleomorphic = perfect) but in some stocks also in the mitotic cycle (anamorphic = imperfect) of exclusively haploid mycelia. These haploid and mitotic fruitbodies can be distinguished from dikaryotic ones only by microscopic examination, i.e. by their lack of clamp connections, karyogamy and meiosis, the production of two-spored basidia with few, but larger basidiospores. Using three other stocks of isogenic mycelial strains that did not form any fruiting structures from either haploid or dikaryotic mycelia with clamp connections, we could not find any evidence for a “fruiting initiation gene” as was postulated byEsser & al. (1977). No fruitbodies occurred in compatible combinations within one isogenic stock, but normal fruitbodies are produced abundantly in crossings of different isogenic stocks. We were able to confirm these results with the help of the non-fruiting strains originally used byStahl & Esser (1976).—Our experimental results are compatible with the hypothesis suggested byKniep (1930): The genetic control of the sexual cycle by the mating type factors A and B on the one hand, and of the fruitbody formation on the other, are essentially independent. For the latter, a multitude of different genes has been proposed. Fruitbody formation thus is a typical polygenic character. The results of experiments on two other morphological characters i.e. primordia and coralloid structures, also correspond with this genetic concept.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00989011
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  • 2
    Digitale Medien
    Digitale Medien
    Phytopathogenic Filamentous (Ashbya, Eremothecium) and Dimorphic Fungi (Holleya, Nematospora) with Needle-shaped Ascospores as New Members Within the Saccharomycetaceae (1997)
    New York, NY [u.a.] : Wiley-Blackwell
    Yeast 13 (1997), S. 945-960 
    Details
    ISSN: 0749-503X
    Schlagwort(e): Ashbya ; Eremothecium ; Holleya ; Kluyveromyces ; Metschnikowia ; Nematospora ; Saccharomyces ; Crustaceae ; Diplopoda ; Heteroptera ; Saccharomycetaceae ; phylogeny ; taxonomy ; Life and Medical Sciences ; Genetics
    Quelle: Wiley InterScience Backfile Collection 1832-2000
    Thema: Biologie
    Notizen: Phylogenetic relationships between species from the genera Kluyveromyces and Saccharomyces and representatives of the Metschnikowiaceae (Holleya, Metschnikowia, Nematospora) including the two filamentous phytopathogenic fungi Ashbya gossypii and Eremothecium ashbyii were studied by comparing the monosaccharide pattern of purified cell walls, the ubiquinone system, the presence of dityrosine in ascospore walls, and nucleotide sequences of ribosomal DNA (complete 18S rDNA, ITS1 and ITS2 region). Based on sequence information from both ITS regions, the genera Ashbya, Eremothecium, Holleya and Nematospora are closely related and may be placed in a single genus as suggested by Kurtzman (1995; J. Industr. Microbiol. 14, 523-530). In a phylogenetic tree derived from the ITS1 and ITS2 region as well as in a tree derived from the complete 18S rDNA gene, the genus Metschnikowia remains distinct. The molecular evidence from ribosomal sequences suggests that morphology and ornamentation of ascospores as well as mycelium formation and fermentation should not be used as differentiating characters in family delimitation. Our data on cell wall sugars, ubiquinone side chains, dityrosine, and ribosomal DNA sequences support the inclusion of plant pathogenic, predominantly filamentous genera like Ashbya and Eremothecium or dimorphic genera like Holleya and Nematospora with needle-shaped ascospores within the family Saccharomycetaceae. After comparison of sequences from the complete genes of the 18S rDNA the genus Kluyveromyces appears heterogeneous. The type species of the genus, K. polysporus is congeneric with the genus Saccharomyces. The data of Cai et al. (1996; Int. J. Syst. Bacteriol. 46, 542-549) and our own data suggest to conserve the genus Kluyveromyces for a clade containing K. marxianus, K. dobzhanskii, K. wickerhamii and K. aestuarii, which again can be included in the family Saccharomycetaceae. The phylogenetic age of the Metschnikowiaceae and Saccharomycetaceae will be discussed in the light of coevolution. © 1997 John Wiley & Sons, Ltd.
    Zusätzliches Material: 4 Ill.
    Materialart: Digitale Medien
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