Principles of branch formation and branch patterning in Hydrozoa.

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  • Author(s): Berking S;Berking S
  • Source:
    The International journal of developmental biology [Int J Dev Biol] 2006; Vol. 50 (2-3), pp. 123-34.
  • Publication Type:
    Journal Article
  • Language:
    English
  • Additional Information
    • Source:
      Publisher: University of the Basque Country Press Country of Publication: Spain NLM ID: 8917470 Publication Model: Print Cited Medium: Print ISSN: 0214-6282 (Print) Linking ISSN: 02146282 NLM ISO Abbreviation: Int J Dev Biol Subsets: MEDLINE
    • Publication Information:
      Original Publication: Vizcaya, Spain : University of the Basque Country Press, [1989-
    • Subject Terms:
      Body Patterning/*physiology ; Hydrozoa/*growth & development; Animals ; Hydra/growth & development ; Models, Biological
    • Abstract:
      The freshwater polyp Hydra produces buds which separate from the parent. Other Hydrozoa produce branches which remain connected to the parent, thus forming a colony. Some Hydrozoa grow by means of an organ that is like a shoot apical meristem. Others display a sympodial type of growth. In this article, I propose that these different types of branches are organized by a common pattern-forming system. This system has self-organizing properties. It causes branch tip formation and is kept active in the tip when the tip finally differentiates into a hypostome of a polyp. The system does not cause structure formation directly but rather, determines a tissue property called positional value, in such a way that a gradient of values forms in the tissue of the bud or branch. The local value determines the local morphodynamic processes, including differentiation of the hypostome (highest positional value), tentacles and basal disc and of the exoskeleton pattern along the shoot. A high positional value favors the onset of a new self-organizing process and by lateral inhibition, such a process prevents the initiation of a further process in its surroundings. Small quantitative differences in the range of the signals involved determine whether a bud or a branch forms and whether monopodial and sympodial growth follows.
    • Publication Date:
      Date Created: 20060216 Date Completed: 20090417 Latest Revision: 20060215
    • Publication Date:
      20221213
    • Accession Number:
      10.1387/ijdb.052043sb
    • Accession Number:
      16479481