Changes in phenolic compounds of sunflowers infected by Plasmopara halstedii

Publisher Website
Google Scholar
Abstract
Fluorescent materials were found to accumulate in sunflower plants infected by Plasmopara halstedii. The main site of accumulation was the upper part of the stem. Chromatographic studies indicated that the major fluorescent compound is scopoletin (6-methoxy-7-hydroxycoumarin). In stem tissues, there was a 23-fold increase in the amount of scopoletin-like fluorescent materials in the 4th week after bud inoculation, and this continued to rise until the 10th week, while it declined in other parts of the infected plant. ‘Chlorogenic acid value’ increased in leaf lesions during the first 2 weeks of pathogenesis and declined by 50% and 80% in infected stems and leaves, respectively, by the 4th week after inoculation. The severe stunting of sunflowers induced by P. halstedii may be connected to the alterations in the phenolic compounds of the host.

This publication has 0 references indexed in Scilit: