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. 1979 Jul;64(1):159–161. doi: 10.1104/pp.64.1.159

Photosynthesis in the Higher Plant Vicia faba

V. Role of Malate as a Precursor of the Tricarboxylic Acid Cycle 1

Samuel S Kent a
PMCID: PMC543044  PMID: 16660906

Abstract

In the higher plant Vicia faba, anomalous labeling patterns in the organic acids and related amino acids of the tricarboxylic acid cycle which result from photosynthetic 14CO2 fixation (in conjunction with an enzyme localization pattern unique to plant mitochondria) suggest that the tricarboxylic acid cycle functions primarily as a pathway leading to glutamic acid biosynthesis during autotrophic growth. The distribution of isotope in citrate indicates little recycling of oxaloacetate for the resynthesis of citrate. Rather, malate appears to provide both the C2 and C4 fragments for the synthesis of citrate, and [3H]formate and 14CO2-labeling patterns implicate serine as the ultimate C3 precursor of malate.

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Selected References

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