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Plastid apportionment and preprophase microtubule bands in monoplastidic root meristem cells of isoetes and selaginella



Plastid apportionment and preprophase microtubule bands in monoplastidic root meristem cells of isoetes and selaginella



Protoplasma 123(2): 95-103



Ultrastructural observations on monoplastidic root tip cells of Isoetes and Selaginella demonstrate 2 important phenomena associated with preprophasic preparation for mitotic cell division: the preprophase band and 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 successive 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.

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Accession: 006133572

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