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The change of pattern in microfibril arrangement on the inner surface of the cell wall of Closterium acerosum during cell growth

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Abstract

Closterium acerosum (Schrank) Ehrenberg cells cultured on cycles of 16 h light and 8 h dark, undergo cell division synchronously in the dark period. After cell division, the symmetry of the daughter semicells is restored by controlled expansion, the time required for this restoration, 3.5–4 h, being relatively constant. The restoration of the symmetry is achieved by highly oriented surface expansion occurring along the entire length of the new semicell. During early semicell expansion, for about 2.5 h, microfibrils are deposited parallel to one another and transversely to the cell axis on the inner surface of the new wall. Wall microtubules running parallel to the transversely oriented microfibrils are observed during this period. About 2.5 h after septum formation, preceding the cessation of cell elongation, bundles of 7–11 microfibrils running in various directions begin to overlay the parallel-arranged microfibrils already deposited. In the fully elongated cells, no wall microtubules are observed.

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References

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Hogetsu, T., Shibaoka, H. The change of pattern in microfibril arrangement on the inner surface of the cell wall of Closterium acerosum during cell growth. Planta 140, 7–14 (1978). https://doi.org/10.1007/BF00389373

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Key words

  • Cell shape
  • Cell wall
  • Microfibrils
  • Microtubules
  • Closterium