Wavelength effects on photosynthetic carbon metabolism in Chlorella

概要

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To study the wavelength-effect on photosynthetic carbon metabolism ^<14>C-bicarbonate was added to Chlorella vulgaris 11 h suspension under monochromatic blue (456 nm) and red (660 nm) light. The light intensities were so adjusted that the rates of ^<14>CO_2 fixation under blue and red light were practically equal. Analysis of ^<14>C-fixation products revealed that the rates of ^<14>CO_2 incorporation into sucrose and starch were greater under red light than under blue light, while blue light specifically enhanced ^<14>CO_2 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 ^<14>CO_2 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 wavelength light of very low intensity. Possible effects of wavelength regulation of photosynthetic carbon metabolism in algal cells are discussed.
日本植物生理学会の論文