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Cleavage and differentiation in the sea urchin embryo transplantation studies of micromeres

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Summary

Micromeres isolated from the 16-cell stage were implanted on mesomeres or macromeres from the same larva. The process of coalescence and the cleavage pattern of the transplanted micromeres were studied by means of light and electron microscopy.

The transplanted micromere shows the same cleavage pattern as the micromerein situ. A close contact is established between the micromere and the host cell and cytoplasmic bridges are found between the cells.

The micromere is dependent on its adjoining blastomere(s) and the rate of cleavage is slowed down when the micromere is isolated. Macromeres and mesomeres are not subjected to a similar change in rate of cleavage when isolated from the rest of the embryo.

The ratio mitochondria/yolk in micromeres is different from that observed in macro- or mesomeres and the possible consequences of this fact are discussed.

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Author notes

  1. Sunniva Lönning

    Present address: Institute of Physiology, University of Bergen, Bergen, Norway

  2. Berndt E. Hagström

    Present address: Research Department of the KABI-Group, Stockholm, Sweden

Authors and Affiliations

  1. Institute of Physiology, University of Bergen, Bergen, Norway

    Berndt E. Hagström

  2. Research Department of the KABI-Group, Stockholm, Sweden

    Sunniva Lönning

Authors
  1. Sunniva Lönning
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  2. Berndt E. Hagström
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Lönning, S., Hagström, B.E. Cleavage and differentiation in the sea urchin embryo transplantation studies of micromeres. Protoplasma 73, 303–322 (1971). https://doi.org/10.1007/BF01273935

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  • DOI: https://doi.org/10.1007/BF01273935

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