, Volume 129, Issue 1, pp 75–82 | Cite as

Cytokinesis in the green alga Eremosphaera viridis: Plasmalemma formation from “open membranes”

  • David G. Robinson
  • Harald Sachs
  • Frank Mayer


Cytokinesis in the unicellular chlorococcalean alga Eremosphaera viridis de Bary has been investigated by electron microscopy of thin sections. The new plasmalemmata of the daughter cells in this organism form centrifugally within a phycoplast. Unlike other cell division systems each new plasmalemma is formed, not by the fusion of vesicles, but rather by the fusion of “open membranes” which are characteristically heavily stained. Measurements of these “open membranes” reveal that they are 11 nm thick with a central 4,5 nm unstained portion. The possible origin of these “open membranes” as burst-open vesicles has been suggested from the presence of intensely straining vesicles in the vicinity of the cell equator. Calculations of vesicle and “open membrane” surface areas support this contention.


Microscopy Electron Microscopy Cell Division Thin Section Green Alga 
These keywords were added by machine and not by the authors. This process is experimental and the keywords may be updated as the learning algorithm improves.


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Copyright information

© Springer-Verlag 1976

Authors and Affiliations

  • David G. Robinson
    • 1
  • Harald Sachs
    • 1
  • Frank Mayer
    • 2
  1. 1.Pflanzenphysiologisches Institut der UniversitätGöttingenFederal Republic of Germany
  2. 2.Institut für Mikrobiologie der UniversitätGöttingenFederal Republic of Germany

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