EFFECT OF SOME SULFHYDRYL REAGENTS ON LIGHT-INDUCED CO_2-FIXATION IN CHLORELLA

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1. Using intact cells of Chlorella ellipsoidea, investigations were made on the effects of some SH-reagents (IAA, CMB and arsenite) upon various reactions pertaining to the primary photogenic agent (designated by R) formed in the mechanism of photosynthesis. 2. The pre-illumination experiments using ^<14>CO_2 as a tracer have led us to the inference that (i) the process of photochemical formation of Ris inhibited by IAA, that (ii) the spontaneous decay of R in the dark is markedly accelerated by CMB and arsenite, but not at all affected by IAA, and that (iii) the participation of R in the cyclic path of carbon leading to the fixation of CO_2 is not affected by IAA and CMB. 3. Based on the assumption that R is a reducing agent, it was discussed that the fact menti.oned under (iii) is incompatible with the idea that the reduction of PGA to triose phosphate be the sole or rate-determining reductive step in the cyclic path of carbon in photosynthesis. 4. The possibility that R may have a functional SH-group(s) was invoked to account for the observation that the decay of R in the dark was markedly accelerated by CMB and arsenite.
日本植物生理学会の論文