ISHS Acta Horticulturae 381: International Symposium on Natural Phenols in Plant Resistance
MODES OF EXPRESSION OF PHENYLALANINE AMMONIA-LYASE AND CHALCONE SYNTHASE IN ELICITOR-TREATED CARROT CELL CULTURES |
| Authors: | D.E. Steimle, J.-P. Schnitzler, H.U. Seitz |
| Abstract:
Upon treatment with fungal elicitors or UV-irradiation of cell cultures of Daucus carota show a differential regulation of phenylalanine ammonia-lyase (PAL) and chalcone synthase (CHS), the key enzymes of the general phenylpropanoid pathway and the flavonoid pathway. UV-light induces the biosynthesis of anthocyanins as putative UV-light protectants, whereas treatment with an elicitor derived from Pythium aphanidermatum inhibits anthocyanin accumulation and leads to the synthesis of wall-bound 4-hydroxybenzoic acid (4-HBA). Elicitor treatment leads to a rapid and transient accumulation of PAL mRNA. The amount of CHS mRNA decreases rapidly and strongly upon elicitation. | |
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