The development of structure and function in chloroplasts of greening mutants of Scenedesmus IV. Blue light-dependent carbohydrate and protein metabolism

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概要

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• Pigment mutant C-2A' of Scenedesmus obliquus forms only traces of chlorophyll when grown heterotrophically in the dark. The chloroplast shows pre-thylakoid structures and a high content of starch grains. Illumination causes a sequence of reactions leading, finally, to chloroplasts with normal thylakoids and an efficiently functioning photo-synthetic apparatus. Upon illumination the respiration of the cells is enhanced, starch is degraded and protein is synthesized. The newly-formed protein in turn is used for formation of enzyme(s) leading to the synthesis of δ-aminolevulinic acid, of structural proteins in the thylakoid membranes and finally to the chlorophyll holochrome. Most of the newly-synthesized protein becomes part of the thylakoid membranes. All these processes are strictly blue light-dependent. The blue light phenomena can be separated into two groups on the basis of small wavelength shifts and of their energy requirement. Enhancement of respiration and starch degradation are saturated at low energy (0.4 w/m^2) whereas the subsequent protein synthesis and following processes are saturated at high energy (100 w/m^2). From the wavelength dependence of the reactions we conclude, in accordance with other authors, that flavoproteins are the primary photoreceptors. The possibility that the primary low energy process might excite a flavoprotein which in turn causes a conformational change in its apoprotein, and that the high energy process might present a direct energy transduction via a flavoprotein is discussed.

• 日本植物生理学会の論文

著者

• Senger Horst

  Botanisches Institut Der Universitat Marburg

• Brinkmann Gerd

  Botanisches Institut Der Universitat Marburg

関連論文

• The development of structure and function in chloroplasts of greening mutants of Scenedesmus III. Biosynthesis of δ-aminolevulinic acid
• Spectral effectiveness in chlorophyll and 5-aminolevulinic acid formation during regreening of glucose-bleached cells of Chlorella protothecoides
• The development of structure and function in chloroplasts of greening mutants of Scenedesmus I. Formation of chlorophyll
• Quantum yield and conformational changes during greening and bleaching of Chlorella protothecoides
• The development of structure and function in chloroplasts of greening mutants of Scenedesmus IV. Blue light-dependent carbohydrate and protein metabolism
• Studies on nucleic acids in plastids of the pigment mutant C-2A' of Scenedesmus obliquus

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