Protoplasma

, Volume 100, Issue 3, pp 267–288

Wall morphogenesis in diatoms: Deposition of silica by cytoplasmic vesicles

Authors

  • Anna -Maria M. Schmid
    • Botanisches Institut der Universität Salzburg
  • D. Schulz
    • Botanisches Institut der Universität Salzburg
    • Botanisches Institut der Tierärztlichen Hochschule Hannover
Article

DOI: 10.1007/BF01279316

Cite this article as:
Schmid, A.-.M. & Schulz, D. Protoplasma (1979) 100: 267. doi:10.1007/BF01279316

Summary

Several TEM and SEM techniques were applied to examine developing structures in valves of the centric diatomThalassiosira eccentrica (Ehrenb.) Cleve after cytokinesis. It was possible to confirm that in each stage of the silicification process there is a distinction between a “growing zone” with a loose assemblage of silica spheres and a “compacting zone” in an older phase of development. The spherical structure of the silica in the “growing zone” results from the addition of silica by small cytoplasmic vesicles of about 300 to 400 Å in diameter. The vesicle membrane fuses with the silicalemma and the vesicle content is released into the silica-deposition vesicle. The origin of these vesicles, named “STV”, is still unknown.

Keywords

Diatom wallDiatomsMorphogenesisSilica depositionSilica spheresThalassiosira eccentrica

Copyright information

© Springer-Verlag 1979