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14c labelling

European Journal of Phycology (1)

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Floridean starch and carrageenan contents as responses of the red alga Solieria chordalis to culture conditions
ISABELLE FOURNET, MUSTAPHA ZINOUN, ERIC DESLANDES, MARCEL DIOURIS, JEAN YVES FLOC'H
Journal:

European Journal of Phycology / Volume 34 / Issue 2 / May 1999

Published online by Cambridge University Press:

01 May 1999, pp. 125-130

Print publication:

May 1999
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The influence of culture conditions on the biosynthesis and degradation of polysaccharides (starch and carrageenan) in the red alga Solieria chordalis was investigated. Following 1 week of incubation in the dark, the alga synthesized floridean starch at two irradiances, 50 and 480 μmol photons m−2 s−1 (400–700 nm), in nutrient-unenriched seawater. Upon transfer of these cultured algae to nutrient-enriched seawater at 50 μmol photons m−2 s−1, the stored floridean starch was found to break down. 14C labelling revealed that during floridean starch breakdown the tracer was transferred to carrageenan. These results are interpreted as carbon transfer from stored floridean starch for use in carrageenan biosynthesis.