Marine Biology

, Volume 135, Issue 2, pp 219–222 | Cite as

Essential amino acid synthesis and nitrogen recycling in an alga–invertebrate symbiosis

  • J. T. Wang
  • A. E. Douglas
Article

Abstract

When aseptically-cultured sea anemones, Aiptasia pulchella, were incubated with 14C-labelled glucose, aspartate and glutamate, radioactivity was incorporated into animal protein. Radioactivity was recovered from all amino acids in the protein hydrolysates of A. pulchella bearing the symbiotic alga Symbiodinium sp., and from all but seven of the amino acids in A. pulchella experimentally deprived of their algae. These data suggest that these seven amino acids (histidine, isoleucine, leucine, lysine, phenylalanine, tyrosine and valine) may be synthesized by the symbiotic algae and translocated to the sea anemone's tissues; and that methionine and threonine, two amino acids traditionally considered as dietary essentials for animals, are synthesized by A. pulchella. Essential amino acid translocation from the symbiotic algae to the animal host is a core element in symbiotic nitrogen-recycling. Its nutritional value to the animal host is considered in the context of the amino acid biosynthetic capacity of the host.

Preview

Unable to display preview. Download preview PDF.

Unable to display preview. Download preview PDF.

Copyright information

© Springer-Verlag Berlin Heidelberg 1999

Authors and Affiliations

  • J. T. Wang
    • 1
  • A. E. Douglas
    • 1
  1. 1.Department of Biology, University of York, P.O. Box 373, York YO1 5YW, England Fax: 0044 (0)1904 432-860 e-mail: aed2@york.ac.ukGB

Personalised recommendations