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• W1992404920 abstract "Sphagnum plantlets, cultivated in continuous-feed bioreactors, are characterised by high levels of free endogenous phenolics and a pronounced excretion of some phenolics into the effluent culture medium. The transfer of Sphagnum fallax, precultivated in continuous-feed bioreactors, to batch cultures resulted in an increased flux through phenylpropanoid metabolism and an accumulation of p-coumaric acid to 0.1 μM and of trans-sphagnum acid up to 0.5 μM in the external medium [3H]-labelled L-phenylalanine (7.7 GBq mol−1) was rapidly taken up, resulting in an enhanced synthesis and excretion of p-coumaric and trans-sphagnum acid. Specific activities were 6.9 and 5.4 GBq mol−1, respectively, for these cinnamic acids excreted into the external medium. Endogenous pools of trans-cinnamic and p-coumaric acid did not increase and no labelling could be detected in these compounds. Cell wall-bound activity amounted to ca 14% of the applied activity after 48 h of incubation, 59% of which was recovered in dioxane/2 M HCl extracts of the cell wall. Exogenously applied trans-cinnamic acid (0.1 mM) was taken up to 46% and resulted in a transient endogenous accumulation of trans-cinnamic acid, the level of free endogenous p-coumaric and trans-sphagnum acid was found to have decreased. The concentrations of p-coumaric and trans-sphagnum acid in the culture medium rose to 17 and 2.4 μM, respectively, after 48 h of incubation in 0.1 mMtrans-cinnamic acid. Exogenously applied p-coumaric acid (0.1 mM) was taken up to 79% from the incubation solution but not stored endogenously, as metabolic products trans-sphagnum acid and an unknown p-coumaric acid-conjugate accumulated in the external medium and endogenously. These results give evidence for the biosynthetical route from phenylalanine to sphagnum acid and a channelling of pathway intermediates by the enzymes L-phenylalanine ammonia-lyase (EC 4.3.1.5) and cinnamic acid 4-hydroxylase (EC 1.14.13.11)." @default.
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• W1992404920 date "1995-01-01" @default.
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• W1992404920 title "Regulation of phenylpropanoid metabolism by exogenous precursors in axenic cultures of Sphagnum fallax" @default.
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• W1992404920 doi "https://doi.org/10.1111/j.1399-3054.1995.tb00812.x" @default.
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