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  • 1
    Electronic Resource
    Electronic Resource
    Nuclear envelope radiating microtubules in plant cells during interphase mitosis transition (1985)
    Springer
    Protoplasma 128 (1985), S. 43-51 
    Details
    ISSN: 1615-6102
    Keywords: Microtubules ; Interphase-mitosis transition ; Nuclear envelope ; Phragmosome ; Division site
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The microtubule distribution during the transition from interphase to the mitotic phase was examined at ultrastructural level in large highly vacuolated cells ofNautilocalyx lynchii and in small non-vacuolated cells ofPisum sativum. Both cell types contain, besides preprophase bands and perinuclear microtubules, also microtubules radiating from the nucleus into the transvacuolar cytoplasmic strands and cytoplasm respectively. This microtubule array appears to be nucleated by the cell's nuclear envelope (NE) or NE-surrounding cytoplasm. It is hypothesized that the microtubules radiating from the nucleusinitially play a role in the mobilization of the nucleus whilelater on a stabilized part of this array anchors the nucleus in the plane of cell division, and thus forms a cytoskeletal link between nucleus and division site. Our results are discussed in the light of previous work on cytoplasmic behaviour during interphase-mitosis transition in highly vacuolated plant cells.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01273234
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  • 2
    Electronic Resource
    Electronic Resource
    The presence of extended phragmosomes containing cytoskeletal elements in fusiform cambial cells ofFraxinus excelsior L. (1984)
    Springer
    Protoplasma 122 (1984), S. 145-152 
    Details
    ISSN: 1615-6102
    Keywords: Fraxinus excelsior L. ; Dividing fusiform cambial cells ; Phragmosome ; Cytoskeletal elements ; Microtubules ; Cell plate positioning
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Fusiform cambial cells of the ash (Fraxinus excelsior L.), which are strongly elongated and vacuolated, contain a phragmosome which traverses the whole length of the cells during preprophase and karyokinesis and which remains present during cytokinesis until it is integrated in cell plate with adjacent cytoplasm. The phragmosome consists of a thin perforated cytoplasmic layer located in the plane of the future cell plate. Otherwise oriented transvacuolar cytoplasmic layers or strands are not present in these cells. The phragmosome contains cytoskeletal elements, namely microtubules and also microfilament bundles both of which are oriented mainly in longitudinal direction. The phragmosomal microtubules are a new category of microtubules associated with cell division; presumably they guide the centrifugally growing cell plate to the parental cell wall site previously marked by the preprophase band of microtubules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01279448
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