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Plant and Cell Physiology, 1978, Vol. 19, No. 2 277-288
© 1978

Article

Wavelength effects on photosynthetic carbon metabolism in Chlorella1

Shigetoh Miyachi2,3, Shizuko Miyachi2 and Akio Kamiya3,4

2Radioisotope Centre, University of Tokyo Bunkyo-ku, Tokyo, Japan
3Institute of Applied Microbiology, University of Tokyo Bunkyo-ku, Tokyo, Japan

To study the wavelength-effect on photosynthetic carbon metabolism, 14C-bicarbon-ate was added to Chlorella vulgaris 1 lh suspension under monochromatic blue (456 nm) and red (660 nm) light. The light intensities were so adjusted that the rates of 14CO2 fixation under blue and red light were practically equal. Analysis of 14C-fixation products revealed that the rates of 14CO2 incorporation into sucrose and starch were greater under red light than under blue light, while blue light specifically enhanced 14CO2 incorporation into alanine, aspartate, glutamate, glutamine, malate, citrate, lipid fraction and alcohol-water insoluble non-carbohydrate fraction. Pretreatment of the algal cells in phosphate medium in the dark, which was essential for the blue light enhancement of PEP carboxylase activity, was not necessary to induce the above wavelength effects. Superimposition of monochromatic blue light at low intensity (450 erg.cm–2.sec–1) on the red light at saturating intensity caused a significant decrease in the rate of 14CO2 incorporation into sucrose and increase in incorporation into alanine, lipid-fraction, aspartate and other related compounds, indicating that the path of carbon in photosynthesis is regulated by short wavelengdi light of very low intensity. Possible effects of wavelength regulation of photosynthetic carbon metabolism in algal cells are discussed.

1 Part of this investigation was reported at the XII International Botanical Congress, Leningrad, 1975 and the Japan-US Cooperative Science Seminar "Biological Solar Energy Conversion", Miami, 1976. Requests for reprints should be addressed to S. Miyachi, Radioisotope Centre, University of Tokyo, Bunkyo-ku, Tokyo 113, Japan.

4 Present address: Department of Chemistry, Faculty of Pharmaceutical Sciences, Teikyo Univ., Sagamiko, Kanagawa, Japan.

(Received August 6, 1977; )
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