Elektronenoptische Untersuchungen anEndomycopsis fibuliger auf festen N�hrb�den

Takada, Hiroyuki; Yagi, Tadashi; Hiraoka, Jun-Ichi

doi:10.1007/bf01252453

Cited by 14 publications

(3 citation statements)

References 22 publications

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“…The latter type is structurally more complex than the former in that it is usually associated with a valve-like structure referred to as the dolipore (14,24). We believe that the new type of septal micropores observed in G. candidum and several other fungi (8,18,22) may be of taxonomic and phylogenetic significance.…”

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confidence: 89%

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Morphogenesis and Ultrastructure of Geotrichum candidum Septa

1973

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The ultrastructure and mode of formation of septa of Geotrichum candidum were investigated by light and electron microscopy. The invaginations of the lateral membrane and wall appear to initiate at multiple points around the circumference of the cell; the immature septum subsequently assumes a cart-wheel shape, with branched spokes radiating from the center of the septum. Each face of the septum is covered with a membrane possessing hitherto undescribed structural differentiation; the membrane substructures are comprised of two central subunits encircled by 12 identical subunits. The diameter of the entire 12 plus 2 structure is 24 to 25 nm, and the diameter of each individual subunit is approximately 4 nm. The maturation of the septum appears to occur by further deposition of material along the branched skeletal regions. Numerous small openings (micropores), formed as a result of incomplete deposition, ultimately give rise to plasmodesmata. During arthrospore formation, the plasmodesmal canals and associated micropores are occluded by electron-dense materials, rendering each segment of the hyphae completely independent of the rest of the hyphae.

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confidence: 89%

“…These micropores were subsequently shown (11, 23) to be analogous to the plasmodesmata of higher plants (3,9,12,13,16,20,21). Since then, multiperforate septa have been demonstrated in several other fungi (2,8,18,22) and certain algae (1,4).…”

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confidence: 97%

Morphogenesis and Ultrastructure of Geotrichum candidum Septa

1973

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“…WICKERHAM includes in the genus Hansenula all yeasts that produce true mycelia and assimilates nitrates (5,6), while KREGER VAN RIJ distinguishes two groups among the nitrate-negative yeasts with hat-shaped spores: Endomycopsis producing many true mycelia and Pichia producing them rarely or with some difficulties (2,7). From the observations of TAKADA et al (8), BESSON and PIGNAL (9), and KREGER VAN RIJ and VEENHUIS (10,11), who all demonstrated the important difference in the ultrastructure of transverse septa in Endomycopsis mycelia, VAN DER WALT was motivated to propose the genus Ambrosiozyma (12) and to redefine the genus Saccharomycopsis (13). VAN DER WALT gave preponderant value to the criteria "numerous plasmodesmata" and "dolipores -like structure" to separate the Saccharomycopsis and the Ambrosiozyma .…”

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confidence: 99%

The biochemistry and immunology of yeasts that produce true mycelia: Ambrosiozyma, Hormoascus, and Hyphopichia.

Fiol

Hmama

1987

J. Gen. Appl. Microbiol.

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Ambrosiozyma, yeasts that produce true mycelia with transverse septa that communicate by a dolipore type septum, are compared with Hyphopichia and Hormoascus. This study includes intracellular oxidases, nitrite and nitrate reductases, guanine plus cytosine content in DNA (GC-content), cytochrome spectra (a + a3, b, c), coenzyme Q, and serological comparison by immunodiffusion and immunoelectrophoresis, with A. monospora and Hormoascus platypodis as references. The results support the division of the genus Ambrosiozyma into 2 groups based upon GC content, vitamin requirements, and serological homologies. Affinities between Hormoascus platypodis and A. philentoma (vitamin requirements, intracellular nitrite and nitrate reductases, fl-galactosidase, serological homology, cytochrome spectra, and GC content) leads to the placing of Hormoascus platypodis in synonymy with Ambrosiozyma philentoma. Ambrosiozyma ambrosias is compared with the other Ambrosiozyma and with the non-fermentative Pichia, and Hansenula silvicola. These comparisons show that A. ambrosiae has more affinity with the other Ambrosiozyma than with Pichia or Hansenula. Hyphopichia burtonii differs from the other species in regard to vitamin requirements, coenzyme Qg, a2 band of cytochrome c and serological homologies.In recent years, there has been a great development in the systematics of sporogenic yeasts that are capable of producing true mycelia. But numerous cytological and biochemical studies of these species have not always contributed to the clarification of their taxonomic position (1-4).

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