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  • Digitale Medien  (5)
  • Allomyces  (3)
  • Cell chain formation  (1)
  • Cell wall structure  (1)
  • Nicotiana (pollen tube, exocytosis)  (1)
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Materialart
  • Digitale Medien  (5)
Erscheinungszeitraum
Schlagwörter
  • 1
    Digitale Medien
    Digitale Medien
    Exocytosis in non-plasmolyzed and plasmolyzed tobacco pollen tubes (1985)
    Springer
    Planta 166 (1985), S. 287-299 
    Details
    ISSN: 1432-2048
    Schlagwort(e): Cell wall (secondary), deposition ; Exocytosis ; Nicotiana (pollen tube, exocytosis) ; Plasmolysis ; Pollen tube ; Vesicle fusion
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Exocytosis occurring during deposition of secondary wall material was studied by freeze-fracturing ultrarapidly frozen non-plasmolyzed and plasmolyzed tobacco pollen tubes. The secondary wall of tobacco pollen tubes shows a random orientation of microfibrils. This was observed directly on fractures through the tube wall and indirectly as imprints of microfibrils on fracture faces of the plasma membrane of non-plasmolyzed tubes. About half of the plasmatic fracture faces from non-plasmolyzed and plasmolyzed pollen tubes carried hexagonal arrays of intramembraneous particles in between randomly distributed particles. Deposition of secondary wall material was often accompanied by an undulated plasma membrane and the presence of membrane-bound vesicles in invaginations of the plasma membrane, between the plasma membrane and secondary wall and-especially in plasmolyzed tubes-within the secondary wall of tube flanks and wall cap. The findings are discussed in connection with published schemes of membrane behaviour during exocytosis.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00401164
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  • 2
    Digitale Medien
    Digitale Medien
    Development of subprotoplasts from in vitro-grown tobacco pollen tubes (1988)
    Springer
    Sexual plant reproduction 1 (1988), S. 103-113 
    Details
    ISSN: 1432-2145
    Schlagwort(e): Cell chain formation ; Cell wall regeneration ; Cytoplast ; Karyoplast ; Nicotiana (pollen tube subprotoplast) ; Tube formation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Summary Plasmolyzed pollen tubes of Nicotiana tabacum each released one to three subprotoplasts from their tips when treated with wall-degrading enzymes. Wall regeneration and the further development of the subprotoplasts were studied by both light and electron microscopy. Karyoplasts and cytoplasts incubated in a poor culture medium regenerated a cell wall within 60 min; cellulose microfibrils and callose were shown to be present. In 30%–40% of the cells, one-third of which were nucleate, cell chains and tubes developed by polar growth in a ratio of about 1∶1. They sometimes reached a length 7–9 times the diameter of the former subprotoplast within 5 h of incubation. With longer incubation periods the cell wall became two-layered, its ultrastructure resembling that of the pollen tubes. The capacity of cytoplasts to regenerate a wall and develop cell chains and tubes can be explained by the properties ascribed to the cytoplasm of pollen tubes.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00189269
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  • 3
    Digitale Medien
    Digitale Medien
    Cell wall formation in zoospores of Allomyces arbuscula (1974)
    Springer
    Archives of microbiology 98 (1974), S. 147-158 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Allomyces ; Zoospores ; Cell Wall ; Wall Formation ; Lomasome ; Ultrastructure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Ultrastructural observations on encysting haploid zoospores of Allomyces arbuscula are presented with special reference to cell wall deposition. Multivesicular bodies are observed in the cytoplasm of zoospores 15 min after inoculation, lomasomes after 30 min and fine membrane profiles between the plasmalemma and the cyst wall are observed after 4 h indicating a possible system for secretion of cell wall components.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00425277
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  • 4
    Digitale Medien
    Digitale Medien
    Cell wall formation in zoospores of Allomyces arbuscula (1976)
    Springer
    Archives of microbiology 109 (1976), S. 37-43 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Allomyces ; Development of meiospores ; Cell wall structure
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Development of haploid meiospores of Allomyces arbuscula into germling cells with rhizoids and hyphae was followed during incubation in complete growth medium. The surface structure of encysted meiospores, rhizoids and hyphae before and after extraction of amorphous materials with ethanolic KOH was studied by means of carbon-platinum replicas. After 2–3 min incubation in complete medium 10% of the meiospores were surrounded by a cell wall containing microfibrils embedded in a matrix. Structure of cell walls of encysted meiospores, rhizoids, and hyphae differ from one another by the location of amorphous materials and by the arrangement of chitin microfibrils.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00425110
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  • 5
    Digitale Medien
    Digitale Medien
    Cell wall formation in zoospores of Allomyces arbuscula (1977)
    Springer
    Archives of microbiology 113 (1977), S. 73-78 
    Details
    ISSN: 1432-072X
    Schlagwort(e): Allomyces ; Cell wall carbohydrates ; Differentiation
    Quelle: Springer Online Journal Archives 1860-2000
    Thema: Biologie
    Notizen: Abstract Carbohydrate composition was determined in isolated cell walls of meiospores of Allomyces arbuscula after incubation for 15 min (encysted meiospores: cysts), 150 min (germlings: cysts + rhizoids) and 24 h (cysts + rhizoids + hyphae). The principal constituent in all cell wall samples is chitin, accounting for about 75% of the recovered carbohydrates. In addition, cell walls of all stages examined contain polysaccharides which release galactose, glucose, mannose, arabinose, xylose, fucose, and rhamnose on acid hydrolysis. While different developmental stages show minor quantitative changes in chitin, the ratio of galactose to glucose decreases sharply during differentiation of ungerminated cysts into germlings with rhizoids and hyphae. The increase in glucose is accompanied by a decrease in the amount of xylose and/or fucose and of galactose.
    Materialart: Digitale Medien
    URL: http://dx.doi.org/10.1007/BF00428583
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