Metabolism of Exogenous Malonate by Coffee Leaf Tissue

When [l-14C]-malonate was supplied to discs cut from mature leaves of Coffea arabica, 14CO2 was released (approximately 12% of the total CO2 respired) and organic acids of the Krebs cycle, uronic acids, sugars and amino acids became radioactive. There was no incorporation of MC into either lipids or...

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Bibliographic Details
Published in:Journal of experimental botany 1983-09, Vol.34 (9), p.1101-1107
Main Authors: NUNES, MARIA ANTONIETA, CONTREIRAS, JOSÉ, SILVA, DULCE FERREIRA DA
Format: Article
Language:English
Subjects:
Amino acids
Biological and medical sciences
Coffee leaves
Ethanol
Flasks
Fundamental and applied biological sciences. Psychology
Leaves
Lipids
Malonate metabolism
Malonates
Metabolism
Organic acids
Pentose phosphate pathway
Photosynthesis, respiration. Anabolism, catabolism
Plant physiology and development
Radioactive decay
Radiocarbon
Sugar acids
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Summary:When [l-14C]-malonate was supplied to discs cut from mature leaves of Coffea arabica, 14CO2 was released (approximately 12% of the total CO2 respired) and organic acids of the Krebs cycle, uronic acids, sugars and amino acids became radioactive. There was no incorporation of MC into either lipids or phenolic compounds. The formation of glucose from malonate has not been observed in other studies with plant tissues. The synthesis of labelled glucose together with an active pentose phosphate pathway that is stimulated by malonate explains the accumulation of radioactive phosphogluconate in the leaf discs. Tentative proposals are made for pathways to account for the results obtained.
ISSN:0022-0957
1460-2431
DOI:10.1093/jxb/34.9.1101