In Capsicum annuum leaves, some phenolic compounds, such as chlorogenic acid and various apigenin or luteolin glycosides, can be separated by HPLC technique. During infection with Phytophthora capsici (the agent of pepper mildew), the concentrations of these compounds decreased. A fungal glucosidasic activity may be implicated, producing apigenin aglycon in the necrotic areas. Some of the phenolic compounds were only present in intercellular spaces, where their concentration increased during fungal infection, mostly in ihe resistant pepper cultivar.The Involvement of phenolics in C. annuum resistance is discussed in relation to oxidative metabolism. Zusaramenfassung Verhalten der phenolischen Verbidiingen in mit Phytophlhora capsici infizierten Capsicum aJuiuvrn-BIMernDurch die HPLC-Technik lassen sich einige in Blattem von Paprika (Capsicum annuum) enthaltene phenohsche Verhindungen trennen, wie Chlorogensaure und verschiedene Apigenin-bzw. LuteolingWkoside, Wahrend der Infektion mit Phytophthora capsici (dem Erreger des PapHkamehltaus) gingen die Konzentrationen dieser Verbindungen zurUck. Eine Glukosidaseaktivitat des Pilzes konnte zur Bildung von Apigenin-Aglykon in den nekrotischen Flachen fuhren, Einige der phenolischen Verbindungen kamen nur in den Interzellularraumen vor, wo ihre Konzentration vor allem hei der resistenten Paprikasorte wahrend der Pilzinfektion zunahm.Die Beteiligung phenolischer Verbindungen an der Resistenz von C. annuum wird unter Bezug auf den oxidativen Metabolismus diskutiert.
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