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  • 1
    Electronic Resource
    Electronic Resource
    Interfertility as basis for the delimitation of Kluyveromyces marxianus (1978)
    Springer
    Archives of microbiology 118 (1978), S. 45-48 
    Details
    ISSN: 1432-072X
    Keywords: Kluyveromyces marxianus ; Hybridization ; Interfertility ; Conspecificity ; Taxonomy
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hybridization studies between strains of Kluyveromyces marxianus and the remaining species of the genus involving the use of auxotrophic mutants, are reported. K. marxianus was found to be interfertile with K. bulgaricus, K. cicerisporus, K. dobzhanskii, K. drosophilarum, K. fragilis, K. lactis, K. phaseolosporus, K. vanudenii and K. wikenii. Accepting interfertility as criterion for conspecificity, these nine syngamous taxa are relegated to the status of biotypes or physiologic races of a single species K. marxianus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00406072
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    A comparison of interfertility and in vitro DNA-DNA reassociation as criteria for speciation in the genus Kluyveromyces (1979)
    Springer
    Antonie van Leeuwenhoek 45 (1979), S. 281-291 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hybridization studies based on the use of the prototrophic selection technique were undertaken to compare interfertility and DNA-DNA reassociation as criteria for speciation purposes in the yeast genus Kluyveromyces. Degrees of DNA-DNA reassociation 〉 70% between strains as reported in the literature, were found to correlate with high recombination frequencies. Degrees of DNA-DNA reassociation 〈 20% between strains did however, not invariably coincide with the absence of interfertility between strains. If interfertility is accepted as criterion for conspecificity, the hitherto reported low degrees ( 〈 20%) of DNA-DNA reassociation in Kluyveromyces cannot confidently be employed for speciation purposes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00418591
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Hybridization studies within the genus Kluyveromyces van der Walt emend. van der Walt (1980)
    Springer
    Antonie van Leeuwenhoek 46 (1980), S. 177-189 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Hybridization studies based on the prototrophic selection technique, involving the use of auxotrophic mutants of strains of all accepted species of the genus Kluyveromyces, are reported. Two main groups of mutually interfertile taxa were established within the genus. The first group comprises Kluyveromyces bulgaricus, K. cicerisporus, K. dobzhanskii, K. drosophilarum, K. fragilis, K. lactis; K. marxianus, K. phaseolosporus, K. vanudenii and K. wikenii. The second group consists of K. dobzhanskii, K. drosophilarum, K. lactis, K. vanudenii and K. wickerhamii. Hybrids were also detected in crosses involving K. drosophilarum and K. waltii as well as K. marxianus and K. thermotolerans. In terms of the concept of the biological species and in compliance with the requirements of the International Code of Botanical Nomenclature, taxa which hybridize with K. marxianus and form fertile recombinants at frequencies observed in intraspecific crosses, are accepted as varieties of K. marxianus.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00444073
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  • 4
    Electronic Resource
    Electronic Resource
    The dangeardien and its significance in the taxonomy of the ascomycetous yeasts (1974)
    Springer
    Antonie van Leeuwenhoek 40 (1974), S. 185-192 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract The concept of a dangeardien is discussed in relation to the ascomycetous yeasts. In species of ascomycetous affinity the dangeardien may be expressed not only as the ascus, but also in the taxa showing an alternation of generation in the absence of an ascosporal state, as a site of reduction division. In such cases it is proposed to refer to the dangeardien as a meioconidiophore and to the externally delimited haplophase, as meioconidia. Taxa showing the formation of meioconidiophores are considered to represent perfect states.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394566
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    Paper (German National Licenses)
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  • 5
    Electronic Resource
    Electronic Resource
    Ascospores in Torulopsis dattila (Kluyver) Lodder (1974)
    Springer
    Antonie van Leeuwenhoek 40 (1974), S. 275-279 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It has been found that the type strain of Torulopsis dattila constitutes a perfect state since it is characterized by the formation of asci which rupture at maturity liberating 1–4 smooth, spheroidal ascospores which tend to agglutinate. On the basis of its physiological properties this strain is considered to be representative of Kluyveromyces thermotolerans.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394385
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  • 6
    Electronic Resource
    Electronic Resource
    Ascospores in the type species of the genus Torulopsis (1974)
    Springer
    Antonie van Leeuwenhoek 40 (1974), S. 281-283 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract It has been found that the type species, T. colliculosa, of the form genus Torulopsis constitutes a perfect state forming ascospores. It is proposed that the same “Torulopsis Lodder et Kreger-Van Rij” based on a new type, be conserved against the earlier homonym “Torulopsis Berlese” which is based on the type T. rosea.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00394386
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    Paper (German National Licenses)
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  • 7
    Electronic Resource
    Electronic Resource
    Cell-wall structure, mitosis and urease activity in Torulopsis species of high GC content (1974)
    Springer
    Antonie van Leeuwenhoek 40 (1974), S. 417-426 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Five Torulopsis species, in which, characteristically, the mean molar percentage of guanine plus cytosine of the DNA bases (GC content) is above 50%, were examined to determine their cell-wall structure; the mode of bud formation; course of mitosis and their urease activity. The two urease-negative species, T. gropengiesseri (% GC 57.1) and T. silvatica (% GC 56.3), were found to possess affinitive properties which characterize perfect ascomycetous yeast species. In the urease-positive species, T. fujisanensis (% GC 65.0–66.1), T. ingeniosa (% GC 55.6) and T. philyla (% GC 63.9), there appeared to be a correlation between pronounced urease activity and the affinitive properties which characterize perfect basidiomycetous yeast species. Pronounced urease activity has, however, also been found in the ascomycetous species Schizosaccharomyces pombe. Consequently neither high GC ratios nor the presence of urease activity when considered individually, can be taken as reliable criteria when attempting to establish the affinity of yeasts the perfect states of which are not known, with the Basidiomycetes. A strain of the ascomycetous species Sclerotinia trifoliorum was examined by electron microscopy for comparative purposes.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00399354
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    Paper (German National Licenses)
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  • 8
    Electronic Resource
    Electronic Resource
    Torulopsis geochares and Torulopsis azyma, two new, haploid species of ascomycetous affinity (1978)
    Springer
    Antonie van Leeuwenhoek 44 (1978), S. 97-104 
    Details
    ISSN: 1572-9699
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Abstract Three strains representative of two undescribed Torulopsis species, T. geochares and T. azyma, were recovered from soil and rupicolous lichen in South Africa. Descriptions of the new species are given. Ploidy determinations by X-ray inactivation showed the type strains of the two new species to be haploid. On the basis of their affinitive characteristics the new species appear to be related to the ascomycetous yeasts.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF00400079
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    Paper (German National Licenses)
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