Relation between physiological factors related to phenols and varietal resistance of potato plant to late blight

Abstract

Relation between physiological factors related to phenols and varietal resistance of potato plant to late blight. II. Experiments with the potato tubers.

Antifungal activity of potato glycoalkaloids and its potential to control severity of dry rot caused by Fusarium sulphureum

“…Some defensive enzymes and metabolites, such as POD, SOD, total phenols, and flavonoids (Debona et al., 2012; Khompatara et al., 2019; Mlíčková et al., 2004; Vandana et al., 2014) can be induced in the infected site when pathogenic fungi attack plants. The content of the induced resistant substances are closely related to the species and quantity of the attacking fungi (Sakai et al., 1964). The more spores inoculated, the more defensive enzymes and metabolites are induced, but their activity and content increased in the initial stages of the disease and decreased as the disease progressed, coinciding with necrosis of tissues.…”

Resistance of Plants to Infectious Agents

“…The compounds are present at the site of infection at concentrations which exceed that required to markedly inhibit the fungus in culture (80). Umbelliferone and scopoletin also increased more rapidly in resistant varieties though their concentration at the site of infection apparently was not sufficient to inhibit the fungus (81) Sakai & Tomiyama (104) reported that varieties of potato resistant to an incompatible race of PhytoPhetora infestans exhibited higher levels of perox idase and polyphenoloxidase activity and higher concentrations of o-diphe nols, but those having lower concentrations of o-diphenols were not neces sarily susceptible. These correlations were not apparent for field resistance.…”