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  • 1
    Electronic Resource
    Electronic Resource
    Morphogenetic plastid migration and microtubule organization during megasporogenesis inIsoetes (1989)
    Springer
    Protoplasma 152 (1989), S. 136-147 
    Details
    ISSN: 1615-6102
    Keywords: Isoetes ; Megasporogenesis ; Monoplastidy ; Meiosis ; Microtubules ; Mitotic apparatus
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary The large megasporocytes ofIsoetes provide an exceptional system for studying microtubule dynamics in monoplastidic meiosis where plastid polarity assures coordination of plastid and nuclear division by the intimate association of MTOCs with plastids. Division and migration of the plastid in prophase establishes the tetrahedrally arranged cytoplasmic domains of the future spore tetrad and the four plastid-MTOCs serve as focal points of a unique quadripolar microtubule system (QMS). The QMS is a dynamic structure which functions in plastid deployment and contributes directly to development of both first and second division spindles. The nucleation of microtubules at discrete plastid-MTOCs is compared with centrosomal nucleation of microtubules in animal cells where growth of microtubules involves dynamic instability.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01323073
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    Paper (German National Licenses)
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  • 2
    Electronic Resource
    Electronic Resource
    Microtubule arrays during mitosis in monoplastidic root tip cells ofIsoetes (1992)
    Springer
    Protoplasma 167 (1992), S. 123-133 
    Details
    ISSN: 1615-6102
    Keywords: Confocal ; Isoetes ; Microtubule ; Mitosis ; Monoplastidy ; Plastid
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Mitosis in monoplastidic root tip cells ofIsoetes was studied by fluorescence (confocal laser scanning microscopy) and transmission electron microscopy. The two major components of division polarity, spindle axis and division site, are established more or less simultaneously in preprophase. Morphogenetic plastid migration results in positioning of a daughter plastid at each pole of the future spindle. Concomitant with establishment of the spindle axis, the division site is marked by a girdling band of mirotubules (preprophase band). Endoplasmic microtubules interconnect the polar plastids and preprophase band suggesting a mechanism for communication and final alignment of spindle axis and division site. As in other monoplastidic cells, the spindle appears to emanate from the plastids. In telophase, the focus of microtubules shifts to the reforming nuclei as the phragmoplast is initiated. Microtubules which continue to emanate from plastids are incorporated into the phragmoplast as it expands beyond the interzonal region. Cortical microtubules are restored in a random fashion before assuming a transverse arrangement in interphase.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01403375
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    Paper (German National Licenses)
    Fulltext
  • 3
    Electronic Resource
    Electronic Resource
    Plastid apportionment and preprophase microtubule bands in monoplastidic root meristem cells ofIsoetes andSelaginella (1984)
    Springer
    Protoplasma 123 (1984), S. 95-103 
    Details
    ISSN: 1615-6102
    Keywords: Microtubules ; Mitosis ; Plastids ; Preprophase Band ; Isoetes ; Selaginella
    Source: Springer Online Journal Archives 1860-2000
    Topics: Biology
    Notes: Summary Ultrastructural observations on monoplastidic root tip cells ofIsoetes andSelaginella demonstrate two important phenomena associated with preprophasic preparation for mitotic cell division, 1. the preprophase band and 2. precise orientation of the dividing plastid relative to the preprophase band. Both of these phenomena accurately predict the future plane of cell division. The plastid divides in a plane parallel to the spindle and each cell inherits a single plastid which caps the telophase nucleus. When succesive transverse divisions occur, the plastid migrates prior to prophase from a position near an old transverse wall to a lateral position in the cell. The plastid is oriented with its median constriction precisely intersected by the plane of the preprophase band. When a longitudinal division follows a transverse division, the plastid remains in its position adjacent to an old transverse wall where it is bisected by the plane of the longitudinally oriented preprophase band microtubules.
    Type of Medium: Electronic Resource
    URL: http://dx.doi.org/10.1007/BF01283580
    Library Location Call Number Volume/Issue/Year Availability
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    Paper (German National Licenses)
    Fulltext
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