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Light quality effects on subsequent dark 14CO2-fixation in Fucus serratus
Authors:Tremblin  G.  Jolivet  P.  Coudret  A.
Affiliation:(1) Laboratoire de Biologie et Physiologie végétales, Faculté des Sciences, Université du Maine, 72017 Le Mans, France;(2) Laboratoire de Chimie Biologique, Institut National Agronomique, Paris-Grignon, Centre de Biotechnologie Agro-industrielle, 78850 Thiverval-Grignon, France;(3) Laboratoire de Physiologie et Génétique végétales, Université B. Pascal, 4 rue Ledru, 63038 Clermont-Ferrand, France
Abstract:The intensity and fate of 14CO2-fixation in the dark are studied on Fucus serratus apices previously maintained under low illumination conditions using white, blue, red or yellow isoquantic lights.In the case of a 180 s pulse, light quality affected dark carbon-fixation, with a higher level of incorporation into ethanol-soluble organic matter in the case of yellow light cultivated apices. After a 30 s pulse 14C was mainly fixed into glycerate and aspartate-malate pools whatever the pre-treatment light conditions, with a higher level into glycerate when apices were pre-illuminated with blue or yellow light. After a 180 s pulse, 14C was mainly transferred into amino acids (glutamate and alanine) at the expense of aspartate and malate in red and yellow pre-illumination conditions, as found in the white light reference experiment, and only at the expense of glycerate in blue light pre-illumination conditions.The metabolic pathway of glycerate formation, principally enhanced by blue light preillumination, remains unexplained under these non-photosynthetic conditions. Results are discussed with reference to CO2-fixation via phosphoenolpyruvate carboxykinase and light quality effects on its in vitro activity.
Keywords:marine macroalgae  glycerate  dark carboxylation  coloured light  phosphoenolpyruvate carboxykinase
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