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  • 1
    Electronic Resource
    Electronic Resource
    Golgi apparatus activity and membrane flow during scale biogenesis in the green flagellateScherffelia dubia (Prasinophyceae). I: Flagellar regeneration (1986)
    Springer
    Protoplasma 130 (1986), S. 186-198 
    Details
    ISSN: 1615-6102
    Keywords: Flagellar regeneration ; Golgi apparatus ; Green algae ; Membrane flow ; Scale biogenesis ; Scherffelia dubia
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Cells ofScherffelia dubia regenerate flagella with a complete scale covering after experimental flagellar amputation. Flagellar regeneration was used to study Golgi apparatus (GA) activity during flagellar scale production. By comparing the number of scales present on mature flagella with the flagellar regeneration kinetics, it is calculated that each cell produces ca. 260 scales per minute during flagellar regeneration. Flagellar scales are assembled exclusively in the GA and abstricted from the rims of thetrans-most GA cisternae into vesicles. Exocytosis of scales occurs at the base of the anterior flagellar groove. The central portion of thetrans-most cisterna, containing no scales, detaches from the stack of cisternae and develops a coat to become a coated polygonal vesicle. Scale biogenesis involves continuous turnover of GA cisternae, and scale production rates indicate maturation of four cisternae per minute from each of the cells two dictyosomes. A possible model of membrane flow routes during flagellar regeneration, which involves a membrane recycling loop via the coated polygonal vesicles, is presented.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01276600
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  • 2
    Electronic Resource
    Electronic Resource
    Golgi apparatus activity and membrane flow during scale biogenesis in the green flagellateScherffelia dubia (Prasinophyceae). II: Cell wall secretion and assembly (1986)
    Springer
    Protoplasma 131 (1986), S. 174-184 
    Details
    ISSN: 1615-6102
    Keywords: Cell wall ; Golgi apparatus ; Green Algae ; Membrane flow ; Scales ; Scherffelia ; Self-assembly ; Theca
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Secretion of the cell wall (theca) in the scaly green flagellateScherffelia dubia (Prasinophyceae) has been examined by electron microscopy during cytokinesis. The bi-laminate wall forms by the extracellular amalgamation of two layers of scales produced in the Golgi apparatus (GA). Each mature GA cisterna contains ca. 12,000 scales of two distinct varieties arranged in two layers on the cisternal membrane. GA cisternae undergo turnover and one scale containing cisterna matures from thetransface of each dictyosome every 3–4 minutes. Cisternae then fuse with the plasma membrane at the anterior end of the cell releasing the scales onto the cell surface. The two layers of wall scales integrate on the cell surface in a time-dependent self-assembly process. The first scales deposited commence assembly at the cell posterior and the wall develops anteriorly by edge growth. The daughter cell wall is composed of ca. 1.2 million scales deposited in about 3 hours. Calculations of net membrane flow strongly indicate extensive endocytosis during wall deposition.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01285039
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