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  • 1
    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
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