phytoalexin


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Related to phytoalexin: aposematic coloration

phytoalexin

a defensive chemical produced by higher plants that is often fungicidal in action (see PLANT DISEASE). Phytoalexins are specific to particular attacking organisms; about 30 types have been identified in various plants, particularly the Leguminosae.
References in periodicals archive ?
Kauralexins and zealexins, members of a larger family of plant-defense compounds known as "terpenoid phytoalexins," are also partly triggered by insect chewing--with Ostrinia nubilalis, the European corn borer, among species that find them distasteful.
Phenylalanine ammonia lyase enzyme catalyzes the first step in the phenylpropanoid metabolism, which is the conversion of L-phenylalanine to trans-cinnamic acid which leads to the synthesis of defense related compounds including lignins and phytoalexins (Rookes and Cahill, 2003).
Another technique might be to externally challenge post-harvested plants, such as grapes, with UV radiation, which would lead to an increase in the levels of resveratrol, a phytoalexin, in grapes.
With this concept in mind, the new term "paldoxin" was coined to designate potential PhytoALexin DetOXification INhibitors.
In this study we used fluorescence polarization (FP) to investigate the estrogenic activity of isoflavones, coumestans, phytoalexins, and mycoestrogens in competition binding assays with human ER[Alpha] and ER[Beta].
Resveratrol (3,5,4'-trihydroxy-trans-stilbene), a phytoalexin produced naturally by several plants when under attack by pathogens such as bacteria or fungi, significantly extends the lifespan of the yeast Saccharomyces cerevisiae, Caenorhabditis elegans and the fruit fly Drosophila melanogaster.
Elicitor-induced association of isoflavone omethyltransferase with endomembranes prevents the formation and 7-omethylation of daidzein during isoflavonoid phytoalexin biosynthesis.
Resveratrol (trans-3,5,4'-trihydroxystilbene) is a stilbenoid, a type of natural polyphenol and aromatic phytoalexin found predominantly in grapes, berries (mulberries), and Japanese knotweed.
Concentration of the phytoalexin resveratrol in wine.
Protective effect of resveratrol, a polyphenolic phytoalexin on glycerol-induced acute renal failure in rat kidney.
Phytoalexin elicitation in grape berries and their susceptibility to Rhizopus stolonifer.
This antimicrobial role of phenolics is based on indirect evidence, such as correlations between the timing of phytoalexin accumulation in resistant and susceptible interactions and the potency of phenolics as antimicrobial agents in vitro.