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ISHS Acta Horticulturae 381: International Symposium on Natural Phenols in Plant Resistance

EFFECT OF FUNGAL INFECTION ON ELLAGITANNINS AND FLAVANOLS OF RASPBERRY ROOTS (RUBUS IDAEUS L.)

Authors:   N. Laun, V. Zinkernagel, D. Treutter, W. Feucht
DOI:   10.17660/ActaHortic.1994.381.112
Abstract:
Phenolic compounds from the roots of young raspberry plants (Rubus idaeus L.) were analyzed by HPLC and the flavanols were localized histochemically. The ellagitannins, which were tentatively identified by their UV-absorbance spectra, disappear after infection by the fungus Phytophthora fragariae var. rubi while browning of the root surface is extending. Nevertheless, the flavanols(catechin and epicatechin) remain extractable which can be explained by the localization of the flavanols in the endodermal cell layer surrounding the central cylinder whereas the ellagitannins are situated in the bark which is sensitive to oxidation. No difference between the preinfectional phenol patterns of susceptible and resistant cultivars could be found.

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