Nutritional Interactions as Signals in the Green Hydra Symbiosis

  • A. E. Douglas
Part of the NATO ASI Series book series (volume 17)


A wide range of cell-cell interactions are mediated by the release of specific molecules by signalling cells, leading to a defined physiological response of target cells. Our concept of signalling derives largely from animal systems. Often the signalling and target cells are in close apposition and the signal is’ borne on the surface of the signalling cell or passes directly between the cytoplasmic contents of the two cells via gap junctions. Other interacting animal cells are widely-separated and the signal passes through extracellular fluids (e.g. bloodstream) to the target cell. Binding of the signal to a receptor molecule on the target cell represents ‘receipt’ of the signal, and this interaction between signal and receptor is conventionally known as ‘recognition’.


Glutamine Synthetase Algal Cell Glutamine Synthetase Activity Free Ammonia Relative Biomass 
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  1. David, C.N. & Campbell, R.D. (1972). Cell cycle kinetics and development of Hydra viridis. I. Epithelial cells. J. Cell Sci. 11, 557–568.PubMedGoogle Scholar
  2. Douglas, A.E. (1987). Alga-invertebrate symbiosis. Ann. Phytochem. Soc. Europe 29 (in press).Google Scholar
  3. Douglas, A.E. & Huss, V.A.R. (1986). On the characteristics and taxonomic position of symbiotic Chlorella. Arch. Microbiol. 145, 80–84.CrossRefGoogle Scholar
  4. Douglas, A.E. & Smith, D.C. (1983). The cost of symbionts to the host in the green hydra symbiosis. In Endocytobiology, Endosymbiosis & Cell Biology (ed. W. Schwemmler & H.E.A. Schenk) pp. 631–648. Walter de Gruyter, Berlin.Google Scholar
  5. Douglas, A.E. & Smith, D.C. (1984). The green hydra symbiosis. VIII. Mechanisms in symbiont regulation. Proc. R. Soc. Lond. B 221, 291–319.CrossRefGoogle Scholar
  6. McAuley, P.J. (1982). Temporal relationships of host cell and algal mitosis in the green hydra symbiosis. J. Cell Sci. 58, 423–431.PubMedGoogle Scholar
  7. McAuley, P.J. (1985). The cell cycle of symbiotic Chlorella. I. The relationship between host feeding and algal cell growth and division. J. Cell Sci. 77, 225–239.PubMedGoogle Scholar
  8. McAuley, P.J. (1986a). Glucose uptake by symbiotic Chlorella in the green hydra symbiosis. Planta 168, 523–529.CrossRefGoogle Scholar
  9. McAuley, P.J. (1986b). Uptake of amino acids by cultured and freshly isolated symbiotic Chlorella. New Phytol. 104, 415–427.CrossRefGoogle Scholar
  10. Mews, L. & Smith, D.C. (1982). The green hydra symbiosis. VI. What is the role of maltose transfer from alga to animal? Proc. R. Soc. Lond. B 216, 397–413.CrossRefGoogle Scholar
  11. Rees, V.A.R. (1986). The green hydra symbiosis and ammonium. I. The role of the host in ammonium assimilation and its possible regulatory significance. Proc. R. Soc. Lond. B 119, 219–234.Google Scholar
  12. Smith, D.C. (1987). Regulation and change in symbiosis. Ann. Bot. (in press).Google Scholar
  13. Smith, D.C. & Douglas, A.E. (1987). The Biology of Symbiosis. Edward Arnold.Google Scholar
  14. Thorington, G. & Margulis, L. (1981). Hydra viridis: transfer of metabolites between Hydra and symbiotic algae. Biol. Bull. 160, 175–188.PubMedCrossRefGoogle Scholar

Copyright information

© Springer-Verlag Berlin Heidelberg 1988

Authors and Affiliations

  • A. E. Douglas
    • 1
  1. 1.John Irmes InstituteColney Lane, NorwichUK

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