Investigations were performed to determine some properties related to photosynthesis in the cultured green cells of soybean (Glycine max L. Merr) and Ruta (Ruta graveolens L.). The results obtained are summarized as follows. 1) The fixation activity of CO2 was determined by the incorpora tion of 14C from Na214CO3. There was no great difference in the amount of photosynthetic CO2 fixation, per chlorophyll unit, between the cultured green cells of Ruta and soybean leaves. In the cultured green cells of soybean also, the CO2 fixation activity was found to be significant, although the activity was relatively lower than that in soybean leaves. 2) The porphyrin synthesis ability of the cultured green cells was examined in a cell free system, and two porphyrins, uroporphyrin and coproporphyrin, which might have been converted from the added δ-aminolevurinic acid, were detected by thin-layer chromatography. 3) The existence of Fraction I protein and its function were confirmed with analytical ultracentrifugation and by an assay of the ribulose-1,5-diphosphate carboxylase activity.
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