Regeneration time at the different levels of hydra

  • Sivatosh Mookerjee
  • Amal Bhattacharjee


  1. 1.

    Regeneration time of the hypostome increases progressively from the oral to the aboral direction. Converse is true for the basal disc. More time is required to form basal disc from aboral-oral direction.

  2. 2.

    In absence of both terminal determinants, the time of regeneration of hypostome and basal disc in a longer piece is less than that of a smaller middle piece; regeneration time in the smaller fragment takes more time.

  3. 3.

    Inhibitory effect of hypostome on the formation of a basal disc has been evidenced in which a slight faster rate of basal disc regeneration is possible in absence of the hypostome in the full length of hydra.

  4. 4.

    In smaller pieces, slower rate of hypostome regeneration is noted in absence of basal disc at posterior regions of the oral end.

  5. 5.

    Hypostome lengthens the time of formation of basal disc in its vicinity, whereas basal disc accelerates the formation of a hypostome in its nearby. Hypostome determining influence is stronger than its counterpart and can act from a greater distance.

  6. 6.

    Determination on hydra has been explained on the basis of an interaction between the relative developmental potential of the participating cells at a given level and the strength of the diffusible communicating system originating from the regions of physiologically active area of hypostome.



Developmental Biology Full Length Slow Rate Fast Rate Active Area 
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  1. Abercrombie, M.: Localized formation of new tissue in an adult mammal. Symp. Soc. exp. Biol.11, 235–254 (1957).Google Scholar
  2. Barth, L. G.: The determination of the regenerating hydranth in tubularia. Physiol. Zool.17, 355–366 (1944).Google Scholar
  3. Bullough, W. S.: The control of mitotic activity in adult mammalian tissues. Biol. Rev.37, 307–342 (1962).Google Scholar
  4. Child, C. M., andL. H. Hyman: Axial gradient in hydra. 1. Biol. Bull.36, 183–221 (1919).Google Scholar
  5. Lesh, G. E., andA. L. Burnett: Some biological and biochemical properties of the polarizing factor in hydra. Nature (London)204, 492–493 (1964).Google Scholar
  6. Loomis, W. P., andH. M. Lenhoff: Growth and sexual differentiation of hydra in mass culture. J. Exp. Zool.132, 555–574 (1956).Google Scholar
  7. Mookerjee, S.: Determination of cell system in hydra. Proc. XVI. Intern. Congr. Zoology, Washington2, 237 (1963).Google Scholar
  8. —, andS. Sanyal: Nature of cellular integration in hydra. Proc. Zool. Soc.15, 119–127 (1962).Google Scholar
  9. —, andA. Sinha: System of stability and lability in hydra. Wilhelm Roux' Arch. Entwickl.-Mech. Org.158, 331–340 (1967).Google Scholar
  10. Rose, S. M.: Specific inhibition during differentiation. Ann. N.Y. Acad. Sci.60, 1136–1159 (1955).Google Scholar
  11. —: Cellular interaction during differentiation. Biol. Rev.32, 351–382 (1957).Google Scholar
  12. Sinha, A.: Endodermal cell types in hydra. (In press.)Google Scholar
  13. Sussman, U.: Animal growth and development, p. 44–46. New Jersey: Prentice-Hall, Inc. 1960.Google Scholar
  14. Tardent, P., andH. Eymann: Experimentelle Untersuchungen über den regene- rationshemmenden Faktor von Tubularia. Wilhelm Roux' Arch. Entwickl.- Mech. Ofg.151, 1–37 (1959).Google Scholar
  15. Turning, A. M.: The chemical basis of morphogenesis. Phil. Trans. Roy. Soc. London B237, 37–72 (1954).Google Scholar
  16. Weiss, P.: Specificity in growth control. In: Biological specificity and growth (Butler, E. G., ed.), p. 195–206. Princeton: University Press 1955.Google Scholar
  17. —, andJ. L. Kavaneu: A model of growth control in mathematical terms. J. gen. Physiol.41, 1–47 (1957).Google Scholar

Copyright information

© Springer-Verlag 1967

Authors and Affiliations

  • Sivatosh Mookerjee
    • 1
  • Amal Bhattacharjee
    • 1
  1. 1.Department of ZoologyPresidency CollegeCalcuttaIndia

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