Plant Systematics and Evolution

, Volume 158, Issue 2, pp 211–223

The special Golgi-ER-mitochondrium unit in the diatom genusCoscinodiscus

  • Anna-Maria M. Schmid

DOI: 10.1007/BF00936345

Cite this article as:
Schmid, A.M. Pl Syst Evol (1988) 158: 211. doi:10.1007/BF00936345


As an exception among diatoms, dictyosomes inCoscinodiscus wailesii andC. centralis form throughout the vegetative cell cycle a complex functional unit with a mitochondrium via an ER-cisterna. Ultrathin sections of spermatogonangia ofC. wailesii revealed that these G-ER-M (Golgi-ER-Mitochondrium) associations are maintained also during spermatogenesis. A dissociation of the G-ER-M-unit occurred however, whenC. wailesii cells formed protoplasts under the influence of the antimicrotubular herbicide APM, leading also to the dissociation of the Golgi stack itself. Lamellar membrane profiles, resembling Golgi membranes were seen to align with the plasmalemma of the protoplasts. These observations are discussed in comparison to the G-ER-M-units found in the xanthophyte algaVaucheria and the oomyceteSaprolegnia.

Key words

DiatomsCoscinodiscusAmiprophos-Methyl (APM)dictyosomesendoplasmic reticulumGolgi apparatusmitochondriaspermatogenesis

Copyright information

© Springer-Verlag 1988

Authors and Affiliations

  • Anna-Maria M. Schmid
    • 1
  1. 1.Institut für PflanzenphysiologieUniversität SalzburgSalzburgAustria