Release of Antifungal Phenolic Compounds from Cucumber Mosaic Virus‐Infected and Noninfected Cowpea Protoplasts

Abstract

Fungitoxic phenolic compounds were released from cucumber mosaic virus (CMV)‐infected and noninfected cowpea protoplasts. These compounds were presumed by thin layer chromatography as similar compounds released into the leaf ambient fluids when CMV‐infected cowpea leaves were incubated in water. Larger amounts of the compounds were released from CMV‐infected cowpea protoplasts than from noninfected protoplasts.

Early defence responses of cowpea (Vigna sinensis L.) induced by non-pathogenic rust fungi

“…Since yellow autofluorescence of plant cell walls is taken as evidence for lignification Tiburzy and Reisener 1990) these microscopical results indicate active defence reactions in interactions between higher plants and rust fungi. As shown with virus-or Phytophthorainfected cowpea plants, however, defence reactions in this species can include the release of substances toxic to fungi, induction of peroxidase isoenzymes, formation of pathogenesis-related proteins and synthesis of isoflavo-w. Fink et al : Non-pathogen-induced early defence responses in cowpea noid phytoalexins (Bailey 1973;Coutts 1978;Ehara and Yamanaka 1981;Coutts 1981, 1982a, b;Ando et al 1984;Ralton et al 1988). A key enzyme in the phenylpropanoid pathway giving rise to synthesis of aromatic compounds used in both phytoalexin synthesis and lignification is phenylalanine ammonia-lyase (PAL).…”