Mother Cell Wall Cleavage during Filament Formation in <i>Stichococcus bacillaris</i> (Trebouxiophyceae, Chlorophyta)

DOI Web Site 被引用文献1件 参考文献9件
  • Yamamoto Maki
    Institute of Natural Sciences, Senshu University
  • Handa Shinji
    Hiroshima Environment and Health Association
  • Kawachi Masanobu
    Microbial Culture Collection, National Institute for Environmental Studies
  • Miyamura Shinichi
    Faculty of Life and Environmental Sciences, University of Tsukuba
  • Nagumo Tamotsu
    Department of Biology, The Nippon Dental University
  • Hirata Aiko
    Bioimaging Center, Graduate School of Frontier Sciences, University of Tokyo
  • Kawano Shigeyuki
    Department of Integrated Biosciences, Graduate School of Frontier Sciences, University of Tokyo

抄録

Stichococcus Nägeli is a unicellular green algal species that belongs to the Trebouxiophyceae. Stichococcus bacillaris Nägeli NIES-3639 propagates by binary fission, but can form a filament without separating into two daughter cells. Transmission electron microscopy showed that cytokinesis starts according to invagination of the plasma membrane at the plane of division. Synthesis of the daughter cell wall occurs on the surface of invaginating plasma membrane during the protoplast division phase. The mother cell wall may cleave after protoplast division in either the single-cell or filament state. Field emission scanning electron microscopy revealed scars of cleaved mother cell walls from the single-cell state, two-cell state after cell division, and four-cell state during filament formation. Because the mother cell wall was cleaved, the delay of the daughter cell separation may have caused filament formation. Since this cell division cycle repeats rapidly, it may begin before the separation of the daughter cells yielded by the former cell cycle.

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