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Journal of Cell Science, Vol 108, Issue 4 1531-1539, Copyright © 1995 by Company of Biologists

JOURNAL ARTICLES

Stationary organization of the actin cytoskeleton in Vallisneria: the role of stable microfilaments at the end walls

JH Ryu, S Takagi and R Nagai
Department of Biology, Faculty of Science, Osaka University, Japan.

In mesophyll cells of the aquatic angiosperm Vallisneria gigantea, bundles of microfilaments (MFs) serve as tracks for the rotational streaming of the cytoplasm, which occurs along the two longer side walls and the two shorter end walls. The stationary organization of these bundles has been shown to depend on the association of the bundles with the plasma membrane at the end walls. To identify the sites of such association, the effects of cytochalasin B (CB) on the configuration of the bundles of MFs were examined. In the case of the side walls, MFs were completely disrupted after treatment with CB at 100 micrograms/ml for 24 hours. By contrast, in the case of the end walls, a number of partially disrupted MFs remained even after 48 hours of treatment. After removal of CB, a completely normal arrangement of bundles of MFs was once again evident within 24 hours after a rather complicated process of reassembly. When reassembly had been completed, the direction of cytoplasmic streaming was reversed only in a small fraction of the treated cells, suggesting that bundles of MFs are anchored and stabilized at the end walls of each cell and that the polarity of reorganized bundles and, therefore, the direction of the cytoplasmic streaming is determined in a manner that depends on the original polarity of MFs that remained in spite of the disruptive action of CB. By contrast, the direction of reinitiated cytoplasmic streaming was reversed in 50% of cells in which the bundles of MFs had been completely disrupted by exogenously applied trypsin prior treatment with CB.(ABSTRACT TRUNCATED AT 250 WORDS)
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 Plant Cell PhysiolHome page
T. Hayashi and S. Takagi
Ca2+-Dependent Cessation of Cytoplasmic Streaming Induced by Hypertonic Treatment in Vallisneria Mesophyll Cells: Possible Role of Cell Wall-Plasma Membrane Adhesion
Plant Cell Physiol., October 15, 2003; 44(10): 1027 - 1036.
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© The Company of Biologists Ltd 1995