Polyphenols and natural resistance of apple leaves against Venturia inaequalis

descriptionPublicationkeyboard_double_arrow_right Article 01 Jan 1968 English Publisher:Springer Science and Business Media LLCJournal:Netherlands Journal of Plant Pathology, volume 74, pages 37-45 (issn: 0028-2944, eissn: 1573-8469,

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Authors: J. Raa;

doi: 10.1007/bf01977511

Polyphenols and natural resistance of apple leaves against Venturia inaequalis

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Abstract

Phloridzin was oxidized via 3-hydroxyphloridzin to the correspondingo-quinone by a polyphenoloxidase present in homogenates and in acetone powders of apple leaves. Phloridzin could also be hydrolyzed by a β-glucosidase to phloretin, which was oxidized, although at a lower rate, to 3-hydroxyphloretin and its correspondingo-quinone. Phloretin and its oxidation products can couple with theo-quinone of 3-hydroxyphloridzin.

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