34 research outputs found
Identification and chromosomal locations of a family of cytochrome P-450 genes for pisatin detoxification in the fungus Nectrla haematococca
Identification of a Degradation Intermediate of the Momilactone A Rice Phytoalexin by the Rice Blast Fungus
In vitro transcription from the Nectria haematococca PDA1 promoter in an homologous extract reflects in vivo pisatin-responsive regulation
Unraveling the Function of the Response Regulator BcSkn7 in the Stress Signaling Network of Botrytis cinerea
A Phytoalexin-Like Flavonol Involved in the Carnation (Dianthus caryophyllus)-Fusarium oxysporum f. sp. dianthi Pathosystem
Induced root-secreted phenolic compounds as a belowground plant defense
Rhizosphere is the complex place of numerous interactions between plant roots, microbes and soil fauna. Whereas plant interactions with aboveground organisms are largely described, unravelling plant belowground interactions remains challenging. Plant root chemical communication can lead to positive interactions with nodulating bacteria, mycorriza or biocontrol agents or to negative interactions with pathogens or root herbivores. A recent study1 suggested that root exudates contribute to plant pathogen resistance via secretion of antimicrobial compounds. These findings point to the importance of plant root exudates as belowground signalling molecules, particularly in defense responses. In our report,2 we showed that under Fusarium attack the barley root system launched secretion of phenolic compounds with antimicrobial activity. The secretion of de novo biosynthesized t-cinnamic acid induced within 2 days illustrates the dynamic of plant defense mechanisms at the root level. We discuss the costs and benefits of induced defense responses in the rhizosphere. We suggest that plant defense through root exudation may be cultivar dependent and higher in wild or less domesticated varieties