Cinnamic acid is a precursor of benzoic acids in cell cultures of Hypericum androsaemum L. but not in cell cultures of Centaurium erythraea RAFN |
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Authors: | Ahmed M A Abd El-Mawla Werner Schmidt Ludger Beerhues |
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Institution: | Institut für Pharmazeutische Biologie, Universit?t Bonn, Nu?allee 6, 53115 Bonn, Germany, DE
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Abstract: | Benzoic acids are precursors of xanthone biosynthesis which has been studied in cell cultures of Hypericum androsaemum (Hypericaceae) and Centaurium erythraea (Gentianaceae). In both cell cultures, methyl jasmonate induces the intracellular accumulation of a new xanthone. Under these
inductive conditions, feeding experiments were performed with U-14C]L-phenylalanine, 7-14C]benzoic acid and 7-14C]3-hydroxybenzoic acid. All three precursors were efficiently incorporated into the elicited xanthone in H. androsaemum, whereas 3-hydroxybenzoic acid was the only precursor to be incorporated into xanthones in C. erythraea. In addition, an appreciable increase in phenylalanine ammonia-lyase activity occurred only in methyl-jasmonate-treated cell
cultures of H. androsaemum. Benzoic acids thus appear to be formed by different pathways in the two cell cultures studied. In H. androsaemum, benzoic acid is derived from cinnamic acid by side-chain degradation. In C. erythraea 3-hydroxybenzoic acid appears to originate directly from the shikimate pathway.
Received: 21 January 2000 / Accepted: 12 July 2000 |
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Keywords: | : Benzoic acid biosynthesis Centaurium (cell culture) Hypericum (cell culture) Methyl jasmonate Xanthone biosynthesis |
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