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  • 1
    Electronic Resource
    Electronic Resource
    The organization of microtubules during generative-cell division inConvallaria majalis (1999)
    Springer
    Protoplasma 207 (1999), S. 147-153 
    Details
    ISSN: 1615-6102
    Keywords: Cell division ; Confocal microscopy ; Convallaria majalis ; Generative cell ; Liliaceae ; Microtubules
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The organization of the microtubule cytoskeleton in the generative cell ofConvallaria majalis has been studied during migration of the cell through the pollen tube and its division into the two sperm cells. Analysis by conventional or confocal laser scanning microscopy after tubulin staining was used to investigate changes of the microtubule cytoskeleton during generative-cell migration and division in the pollen tube. Staining of DNA with 4′,6-diamidino-2-phenylindole was used to correlate the rearrangement of microtubules with nuclear division during sperm cell formation. Before pollen germination the generative cell is spindle-shaped, with microtubules organized in bundles and distributed in the cell cortex to form a basketlike structure beneath the generative-cell plasma membrane. During generative-cell migration through the pollen tube, the organization of the microtubule bundles changes following nuclear division. A typical metaphase plate is not usually formed. The generative-cell division is characterized by the extension of microtubules concomitant with a significant cell elongation. After karyokinesis, microtubule bundles reorganize to form a phragmoplast between the two sperm nuclei. The microtubule organization during generative-cell division inConvallaria majalis shows some similarities but also differences to that in other members of the Liliaceae.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01282994
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  • 2
    Electronic Resource
    Electronic Resource
    The organization of the cytoskeleton in the generative cell and sperms ofHyacinthus orientalis (1992)
    Springer
    Protoplasma 168 (1992), S. 41-50 
    Details
    ISSN: 1615-6102
    Keywords: Pollen tube ; Microtubules ; Cellular division ; Generative cell ; Sperm cells
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The microtubular cytoskeleton of the generative cell (GC) ofHyacinthus orientalis has been studied until the formation of the sperm cells (SCs). Immunofluorescence procedures in combination with confocal laser scanning microscopy (CLSM) has enabled the visualization of the organization of the microtubular cytoskeleton. Chemical fixation and freeze-fixation electron microscopy have been used to investigate the cytoskeleton and the ultrastructural organization of the GC and SCs. During pollen activation the GC is spindle-shaped. Microtubules (MTs) are organized as bundles and distributed in proximity of the GC plasmamembrane, forming a basket-like structure. Following migration through the pollen tube, the basket-like structure becomes more intertwined. During the nuclear division the MTs are involved in the segregation of the chromosomes and kinetochores are clearly discernible. Association with organelles is also observed. The chromosomes of the GC remain condensed until they separate in two sperm nuclei. The pre-prophase band was never observed. At the end of the GC division the microtubular network reorganizes in the two SCs.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01332649
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    Paper (German National Licenses)
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  • 3
    Electronic Resource
    Electronic Resource
    Kinesin-related polypeptide is associated with vesicles from Corylus avellana pollen (1994)
    New York, NY : Wiley-Blackwell
    Cell Motility and the Cytoskeleton 29 (1994), S. 155-166 
    Details
    ISSN: 0886-1544
    Keywords: Golgi vesicles ; pollen ; pollen tube ; microtubules ; kinesin-related protein ; Life and Medical Sciences ; Cell & Developmental Biology
    Source: Wiley InterScience Backfile Collection 1832-2000
    Topics: Biology , Medicine
    Notes: A 100-kDa polypeptide with microtubule-interacting properties was identified in a Golgi vesicle-enriched fraction from Corylus avellana pollen. The k71s23 antibody (directed to the kinesin heavy chain from bovine brain) [Tiezzi et al., 1992: Cell Motil. Cytoskeleton 21:132-137] localized the polypeptide on the external surface of membrane-bounded organelles. Some 100-kDa-containing vesicles co-pelleted with microtubules (polymerized from purified bovine brain tubulin) either in presence or absence of 5 mM AMPPNP, but they could be released by 10 mM ATP or 0.5 M KCl. The pollen microtubule-interacting protein, salt-extracted from membranes and partially purified by gel filtration, exhibited an ATPase activity (16.2 nmolPi/mg/min) which could be stimulated about 2-fold (32.5 nmolPi/mg/min) by addition of bovine brain microtubules. We suppose that the 100-kDa polypeptide is part of a molecular complex showing properties of the kinesin class. © 1994 Wiley-Liss, Inc.
    Additional Material: 9 Ill.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1002/cm.970290207
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    Paper (German National Licenses)
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