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  • 1
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 128 (1985), S. 64-71 
    ISSN: 1615-6102
    Keywords: Cell wall ; Closterium ; Dictyosome ; Green alga ; Zygote
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The cell wall formation and its correlation with the plasma membrane and dictyosome were investigated by an electron microscope in the zygote cells ofClosterium ehrenbergii. During zygote maturation, six wall layers were formed outside the plasma membrane. Wall layer III was the thickest layer and consisted of microfibril bundles. Dictyosomes produced flat vesicles during formation of wall layer III. Hexagonal arrays of rosette particles appeared in the plasma membrane in this period, thus confirming the simultaneous occurrence of flat vesicles and hexagonal particle arrays in the formation of microfibril bundles even at different stages of the life cycle. Wall layer VI was second in thickness and consisted of single microfibrils. Neither flat vesicles nor hexagonal particle arrays were observed during formation of this layer.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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  • 2
    Electronic Resource
    Electronic Resource
    Springer
    Protoplasma 125 (1985), S. 205-213 
    ISSN: 1615-6102
    Keywords: Closterium ; Green algae ; Morphogenesis ; Osmotic pressure ; Zygote formation
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The behavior of gamete cells ofClosterium ehrenbergii in hypertonic solutions was observed and the significance of changes in osmotic pressure of the protoplasts is discussed in relation to zygote formation. The osmotic pressure of fusing gamete protoplasts was calculated to be 0.063 Osm at the original cell volume. The osmotic pressure of immature gamete protoplasts was 0.24 Osm at incipient plasmolysis. This lowering of cell osmotic pressure may serve to protect the rupture of the plasma membrane during migration of protoplasts in the conjugation tube after dissolution of cell walls. During maturation of gamete cells, chloroplasts and dictyosomes differed greatly in their ultrastructure from those of vegetative cells. These structural changes may be induced by changes of the physiological condition including osmotic pressure in the cells.
    Type of Medium: Electronic Resource
    Library Location Call Number Volume/Issue/Year Availability
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