Role de la phenylalanine dans la biosynthese des flavonoides et acides “cinnamique” dans les tiges volubiles de Periploca Graeca

Phenylalanine is the precursor of the cinnamic acids and coumarins in the stems and leafs of P. graeca L. Esterification of p-coumaric acid by quinic acid is required before oxidation to chlorogenic acid. In our experiments, we did not obtain radioactive flavonols from 14C phenylalanine. PAL activit...

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Bibliographic Details
Published inPhytochemistry (Oxford) Vol. 14; no. 10; pp. 2193 - 2197
Main Author Melin, Daniel
Format Journal Article
LanguageFrench
Published Elsevier Ltd 1975
Subjects
Asclepiadaceae
circumnutation
coumarins, cinnamic acids
flavonols
Periploca graeca
phenylalanine ammonia lyase
twining stems
Periploca graeca
Asclepiadaceae
flavonols
phenylalanine ammonia lyase
circumnutation
coumarins, cinnamic acids
twining stems
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Summary:Phenylalanine is the precursor of the cinnamic acids and coumarins in the stems and leafs of P. graeca L. Esterification of p-coumaric acid by quinic acid is required before oxidation to chlorogenic acid. In our experiments, we did not obtain radioactive flavonols from 14C phenylalanine. PAL activity varies as a result of light and temperature in the same manner as the level of flavonoids (especially the phenolic acids). This enzyme, therefore, plays a regulatory role in the synthesis of these phenolic substances. The variation in PAL activity during illumination does not follow the same course as described for other plants.
ISSN:0031-9422
1873-3700
DOI:10.1016/S0031-9422(00)91097-5