Nature of light-induced absorbance changes at 682 mμ and 702 mμ in photosynthesis of Anacystis nidulans
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概要
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Light-induced absorbance changes in the region around the red absorption band of chlorophyll a were measured in cells and lamella fragments of Anacystis nidulans. In both materials, absorbance decreases were observed at 702 mμ and 682 mμ. (The pigments are designated as P_<700> and P_<680>.) The nature of P_<680> Was investigated with special reference to its relationship to P_<700>. In the cells, light absorbed by chlorophyll a caused an absorbance decrease at 682 mμ; Simultaneous illumination with light absorbed by phycocyanin caused a partial recovery of the absorbance decrease. Similar results were observed with the light-induced absorbance change at 702 mμ. This indicates that P_<680> is also an electron carrier in the electron transport chain and occupies a place between the two photoreactions. In lamella fragments, both the light-induced reversible absorbance changes of P_<680> and P_<700> appeared in the presence of an electron donor system; i.e., ascorbate and 2,6-dichlorophenol-indophenol or N,N,N',N'-tetramethyl-1,4-phenylenediamine. The experiments in which the oxidation-reduction potential of the reaction medium was changed showed that both P_<680> and P_<700> are one-electron carriers, having a normal oxidation-reduction potential of 0.44 v (assuming that the normal oxidation-reduction potential of the ferricyanide-ferrocyanide system is 0.409 v). A possibility was suggested that the absorbance change observed at 682 mμ is another expression of the oxidation-reduction reaction of P_<700>.
- 日本植物生理学会の論文
著者
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Murata Norio
Department of Regulation Biology, National Institute for Basic Biology
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Takamiya Atusi
Department Of Biochemistry Faculty Of Science University Of Tokyo
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Murata Norio
Department Of Applied Physics Faculty Of Engineering Osaka University:(present Address)sanyo Electri
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Murata Norio
Department Of Biophysics And Biochemistry Faculty Of Science University Of Tokyo
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