Journal
PLANTA
Volume 212, Issue 1, Pages 119-126Publisher
SPRINGER-VERLAG
DOI: 10.1007/s004250000377
Keywords
benzaldehyde; benzoic acid; 3-hydroxy-3-phenylpropanoic acid phenylpropanoid metabolism; salicylic acid
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Stable-isotape-labelled (H-2(6), O-18) 3-hydroxy-3-phenylpropanoic acid, a putative intermediate in the biosynthesis of benzoic acid (BA) and salicylic acid (SA) from cinnamic acid, has been synthesized and administered to cucumber (Cucumis sativus L.) and Nicotiana attenuata (Torrey). Analysis of the products by gas chromatography-mass spectrometry revealed incorporation of labelling into BA and SA, but not into benzaldehyde. In a separate experiment, 3-hydroxy-3-phenylpropanoic acid was found to be a metabolite of phenylalanine, itself the primary metabolic precursor of BA and SA. These data suggest that cinnamic acid chain shortening is probably achieved by beta -oxidation, and that the proposed non-axidative pathway of side-chain degradation does not function in the biosynthesis of BA and SA, in cucumber and N. attenuata.
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