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Plant Physiol. Apr 1967; 42(4): 487–490.
PMCID: PMC1086570

Photosynthesis in Rhodospirillum rubrum. I. Autotrophic Carbon Dioxide Fixation 1

Abstract

The incorporation and distribution of activity from 14CO2 was investigated under autotrophic conditions in the facultative photoautotroph, Rhodospirillum rubrum, with cells cultured on hydrogen, carbon dioxide, and ammonium sulfate. In 1 second 14CO2 fixation experiments essentially all of the activity was found in 3-phosphoglyceric acid: plotted against time percent incorporation into phosphate esters has a strikingly negative slope. These results suggest that under autotrophic conditions the reductive pentose phosphate cycle or the key reactions of the cycle play a major role in carbon metabolism in this photosynthetic bacterium. Incorporation into amino acids and into intermediates of the tricarboxylic acid cycle was quite low.

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  • Evans MC, Buchanan BB, Arnon DI. A new ferredoxin-dependent carbon reduction cycle in a photosynthetic bacterium. Proc Natl Acad Sci U S A. 1966 Apr;55(4):928–934. [PMC free article] [PubMed]

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