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Geitler's “Plattenband” in the diatomSynedra cf.ulna in the light of TEM investigations

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The ultrastructure of the diatomSynedra cf.ulna was examined paying special attention to the “Plattenband” (platelet band). This structure was first described byGeitler in 1948 on the basis of LM observations and denotes a linear array of dictyosomes along the apical axis of the cell. The present investigation confirmsGeitler's observations in all essential details and demonstrates that the dictyosomes are arranged along polarized nuclear extensions running towards the cell poles. Laterally the extensions are accompanied by a number of microtubules. In large cells the total length of the nucleus thus may reach 400 µm and more. Since only the central part of the nucleus is DNA-positive with DAPI and acridine orange, the nuclear nature of the “backbone” of the Plattenband cannot be recognized by LM techniques. TEM investigation of serial apical and transapical sections, however, prove unambiguously the identity with extended parts of the nucleus.

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Dedicated to Prof. DrLothar Geitler on the occasion of his 90th birthday.

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Schmid, A.M. Geitler's “Plattenband” in the diatomSynedra cf.ulna in the light of TEM investigations. Plant Syst Evol 164, 239–252 (1989).

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Key words

  • Diatoms
  • Synedra ulna
  • Dictyosomes
  • Golgi apparatus
  • microtubules
  • nucleus
  • nuclear extension
  • DNA
  • RNA
  • acridine orange
  • DAPI