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Studies on 14CO2-assimilation in marine rhodophyceae

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Abstract

Experiments on enzymatic (in vitro) and in vivo CO2-fixation using a variety of marine Rhodophyceae such as Porphyra umbilicalis (L.) J.Ag., Rhodomela confervoides (Huds.) Silva, Corallina officinalis L. and Chondrus crispus Stackh. revealed that carbon assimilation in the Rhodophyceae is almost exclusively performed by photosynthesis via ribulose-1, 5-di-phosphate carboxylase, whereas light-independent CO2-fixation via β-carboxylation by phosphoenolpyruvate carboxykinase scarcely exceeds 1% of the total carbon fixation potential of the plants. Activity of phosphoenolpyruvate carboxylase could not be detected. With respect to the main accumulation products of photosynthetic CO2-fixation, the Rhodophyceae investigated are not uniform: Corallina officinalis L., Rhodymenia palmata (L.) Grev., and Gigartina stellata (Stackh.) Batt. have been found to accumulate 14C in the neutral compound floridoside (=2-O-glycerol-α-D-galactopyranose), whereas Delesseria sanguinea (Huds.) Lamour., Ceramium cubrum (Huds,) C.Ag., and Rhodomela confervoides (Huds.) Silva, representing members of the Delesseriaceae, Ceramiaceae and Rhodomelaceae, respectively, do not photosynthesize floridoside, but show intense 14C-labelling in an acidic constituent, mannosidoglycerate (= digeneaside). This compound is reported for the first time as a rapidly 14C-labelled and accumulated photosynthate in a variety of red algal species exclusively belonging to the Ceramiales.

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Authors and Affiliations

  1. Sotanisches Institut der Universität Köln, Köln, Germany (FRG)

    B. P. Kremer

  2. Botanisches Institut der Universität III. Lehrstuhl, Gyrhofstraße 15, D-5000, Köln 41, FRG

    B. P. Kremer

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  1. B. P. Kremer
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Communicated by O. Kinne, Hamburg

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Kremer, B.P. Studies on 14CO2-assimilation in marine rhodophyceae. Mar. Biol. 48, 47–54 (1978). https://doi.org/10.1007/BF00390530

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