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Photosynthetic carbon dioxide fixation in zooxanthellae

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Abstract

The carbon-fixation patterns of freshly isolated zooxanthellae from the hermatypic coral Acropora formosa were examined during a 15 min exposure to sodium mosa were examined during a 15 min exposure to sodium [14C]bicarbonate. The labelling pattern during the first 60 s exposure showed that the C3 carbon-fixation pathway is the major route for photosynthetic carbon fixation in Symbiodinium sp. 3-Phosphoglyceric acid, which constituted >50% of the label after 5 s, steadily decreased over the first 60 s. Hexose phosphates, aspartate, malate and glucose were the other main products during the first 60 s. Over longer periods, significant amounts of the organic acids succinate, aspartate and glutamate were found in the extract along with glucose; but no glycerol.

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Authors and Affiliations

  1. Department of Chemistry and Biochemistry, James Cook University of North Queensland, 4811, Townsville, Queensland, Australia

    M. Streamer, Y. R. McNeil & D. Yellowlees

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  1. M. Streamer
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  2. Y. R. McNeil
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  3. D. Yellowlees
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Communicated by G. F. Humphrey, Sydney

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Streamer, M., McNeil, Y.R. & Yellowlees, D. Photosynthetic carbon dioxide fixation in zooxanthellae. Marine Biology 115, 195–198 (1993). https://doi.org/10.1007/BF00346335

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  • DOI: https://doi.org/10.1007/BF00346335

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