Carbon Metabolism Transitions during the Development of Marine Macroalga Gracilaria verrucosa

Carbon Metabolism Transitions during the Development of Marine Macroalga Gracilaria verrucosa The changes in the rate of photosynthetic and dark CO2 assimilation and the activity of key enzymes of carboxylation were studied during the main developmental stages (shoots, juvenile plants, and mature plants) of red macroalga Gracilaria verrucosa (Huds.) Papenf. Changes in the direction of primary carbon metabolism were also investigated. It was estimated that the transition of metabolism related to the shift in the pathways of carboxylation did not occur during development of G. verrucosa. During all developmental stages, the level of dark CO2 assimilation was by at least one order of magnitude lower than that of photosynthetic assimilation The predominant pathway of CO2 assimilation was ribulosobisphosphate carboxylation. At the same time, the transition of metabolism related to the changes in the type of phosphoglyceric acid utilization was found. At the early developmental stages, a substantial part of phosphoglyceric acid was directed into the amino acid metabolism via the anaplerotic pathway of photosynthesis similar to that in higher plants. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png Russian Journal of Plant Physiology Springer Journals

Carbon Metabolism Transitions during the Development of Marine Macroalga Gracilaria verrucosa

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Publisher
Kluwer Academic Publishers-Plenum Publishers
Copyright
Copyright © 2003 by MAIK “Nauka/Interperiodica”
Subject
Life Sciences; Plant Sciences
ISSN
1021-4437
eISSN
1608-3407
D.O.I.
10.1023/A:1021988402123
Publisher site
See Article on Publisher Site

Abstract

The changes in the rate of photosynthetic and dark CO2 assimilation and the activity of key enzymes of carboxylation were studied during the main developmental stages (shoots, juvenile plants, and mature plants) of red macroalga Gracilaria verrucosa (Huds.) Papenf. Changes in the direction of primary carbon metabolism were also investigated. It was estimated that the transition of metabolism related to the shift in the pathways of carboxylation did not occur during development of G. verrucosa. During all developmental stages, the level of dark CO2 assimilation was by at least one order of magnitude lower than that of photosynthetic assimilation The predominant pathway of CO2 assimilation was ribulosobisphosphate carboxylation. At the same time, the transition of metabolism related to the changes in the type of phosphoglyceric acid utilization was found. At the early developmental stages, a substantial part of phosphoglyceric acid was directed into the amino acid metabolism via the anaplerotic pathway of photosynthesis similar to that in higher plants.

Journal

Russian Journal of Plant PhysiologySpringer Journals

Published: Oct 17, 2004

References

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