Topic
Phytoalexin
About: Phytoalexin is a research topic. Over the lifetime, 1161 publications have been published within this topic receiving 63405 citations. The topic is also known as: phytoalexins.
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TL;DR: Among the antimicrobial phytoalexins produced by Phaseolus vulgaris (French bean) are the prenylated isoflavonoids kievitone and phaseollidin, and activity profiles indicated that the two activities were distinct.
Abstract: Among the antimicrobial phytoalexins produced by Phaseolus vulgaris (French bean) are the prenylated isoflavonoids kievitone and phaseollidin. Two enzyme activities, kievitone hydratase and phaseollidin hydratase, occur in culture filtrates of the bean pathogen, Fusarium solani f. sp. phaseoli, and catalyse similar hydration reactions on the dimethylallyl moieties of the phytoalexins. The enzymes nearly co-purified during hydroxyapatite chromatography followed by preparative native gel electrophoresis. Eluates from successive slices taken from the native gel were assayed for both activities. Although they were not completely separated in the native gel, the activity profiles indicated that the two activities were distinct. The Km of phaseollidin hydratase for phaseollidin was approximately 7 μM.
23 citations
TL;DR: The results do not support the hypothesis that glucanases may function in host defence to release elicitors of the phytoalexin response in the alfalfa/ C. trifolii interaction.
23 citations
TL;DR: The possible involvement of the GP 66 elicitor from the canker stain agent of the plane tree in the activation of the phenolic metabolism of the plant is discussed.
23 citations
TL;DR: Elicitor treatment of intact fruits to protect against rot development by B. cinerea was achieved without the fruits sustaining unsightly damage.
Abstract: Immature Capsicum annuum fruits treated at wound-sites with glucans from the hyphal walls of Glomerella cingulata and incubated for 24 h or longer accumulated levels of capsicannol phytoalexins sufficient to inhibit rot development by Botrytis cinerea. Elicitor application to intact fruits induced the accumulation of relatively low levels of capsicannol compounds but further phytoalexin accumulation in fruits after wound-inoculation with B. cinerea was much more rapid than in untreated fruits and rot development was suppressed.
Capsicannol phytoalexins were produced in the live cells of the epidermis and little or no necrosis was associated with quantities produced in intact tissues. Elicitor treatment of intact fruits to protect against rot development by B. cinerea was achieved without the fruits sustaining unsightly damage.
23 citations
TL;DR: The greatest accumulation of capsidiol corresponds to the 6th day of infection in the necrotic zone of the resistant variety (Smith-5), suggesting that this variety alone has the ability to accumulate sufficiently high phytoalexin levels to inhibit fungal development.
23 citations