Regulation of CO_2-fixation in Chlorella by light of varied wavelengths and intensities
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概要
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1) The wavelength effects on ^<14>CO_2-fixation by Chlorella cells were studied, using monochromatic light of different light intensities. 2, Blue light (453 mμ) stimulated the incorporation of ^<14>C into aspartate, glutamate and malate. Red light (679 mμ), on the other hand, stimulated its incorporation into P-esters, free sugars and insoluble material. 3) The blue light effect was observed in the presence of CMU at concentrations completely suppressing ordinary photosynthetic CO_2-fixation. 4) The blue light effect in the presence of CMU was induced at very low intensities. At 453 mμ, 300 erg cm^<-2> sec^<-1> was sufficient for complete saturation. 5) Time courses of ^<14>C-incorporation into individual compounds were investigated. Irrespective of the wavelength of the illuminating light, the first stable CO_2-fixation product formed under weak light (400-500 erg cm^<-2> sec^<-1>) was citrulline. At higher light intensities (4,000-7,000 erg cm^<-2> sec^<-1>), PGA was the first stable CO_2-fixation product The incorporation of ^<14>C into citrulline was not inhibited by CMU. 6) Experimental results indicate that both blue light-induced incorporation of ^<14>C into amino and organic acids and the incorporation of ^<14>C into citrulline induced by low intensity light are operated by a mechanism(s) independent of ordinary photo-synthetic CO_2-fixation. Possible effects of light regulating the carbon metabolism in algal cells arc discussed.
- 日本植物生理学会の論文
- 1970-02-00
著者
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Miyachi Shigetoh
Institutc Of Applied Microbiology University Of Tokyo
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Ogasawara Noriko
Institute Of Applied Microbiology University Of Tokyo
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Ogasawara Noriko
Institute Of Applied Microbiology University Of Tokyo:tokugawa Institute For Biological Research
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