Abstract
The accumulation of catechin derived procyanidins is regarded as one fundamental factor inhibiting the growth of the pathogenic fungus Botrytis cinerea in immature strawberry fruits–a phenomenon referred to as quiescence after invasion at bloom usually ending during fruit ripening. For evaluation of that hypothesis an attempt was made to modify the concentration of flavanols in developing strawberry fruits by treatments with an inhibitor of 2-oxoglutarate-dependent dioxyge-nases which is known to affect the flavonoid pathway. The accumulation of novel flavonoids identified as luteoliflavan and eriodictyol 7-glucoside and enhanced levels of catechin were found when green fruits were treated. The effect of the bioregulator varies during fruit ontogenesis with a steady increase after flowering to the stage of small green fruits and a rapid decrease thereafter. It became obvious that young fruits just at flowering do not accumulate flavanols to a sufficient level for preventing primary receptacle infection.
Zusammenfassung
Die Akkumulation von Catechin und Proanthocyanidinen in unreifen Erdbeerfrüchten wird als ein Faktor der vorüber-gehenden Resistenz gegenüber Botrytis cinerea, dem Erreger der Grauschimmelfäule, angesehen und dafür verantwortlich gemacht, dass der Pilz nach dem Befall der Blüte bis zur Fruchtreife in einem Ruhezustand verharrt. Zur Bewertung dieser Hypothese wurde ein experimenteller Ansatz gewählt, bei dem die Konzentration von Flavanolen in sich entwickelnden Erdbeerfrüchten durch Behandlung mit einem Inhibitor von 2-Oxoglutarat abhängigen Dioxygenasen modifiziert wer-den sollte. Nach der Behandlung junger, grüner Früchte wur-de die Anreicherung neuartiger Flavonoide, Luteoliflavan und Eriodictyol -7-glucosid, sowie von Catechin festgestellt. Der Effekt der Bioregulator-Behandlung variierte jedoch während der Fruchtentwicklung und hatte die größte Auswirkung bei kleinen grünen Früchten. Zur Zeit der primären Besiedelung der Blüten durch den Pilz ist der junge Blütenboden jedoch nur unzureichend zur Flavanol-Biosynthese befähigt.
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Puhl, I., Treutter, D. Ontogenetic variation of catechin biosynthesis as basis for infection and quiescence of Botrytis cinerea in developing strawberry fruits. J Plant Dis Prot 115, 247–251 (2008). https://doi.org/10.1007/BF03356272
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DOI: https://doi.org/10.1007/BF03356272