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: The lack of inhibitory activity of 1 for spore germination of Pyricularia oryzae indicates that the final cytochrome P450-dependent hydroxylation steps in converting 1 to oryzalexin D and E are essential for the production of rice phytoalexins with antifungal activities.
31 citations
TL;DR: The new isoflavonoids 5,7,2′,4′-tetrahydroxy-8-(3,3-dimethylallyl)isoflavone (2, 3-dehydrokievitone) and 7,2, 4′-trihydroxy -8-( 3,3]-dimethylall isoflavanone (5-deoxykievinea) have been isolated from fungus-inoculated Phaseolus vulgaris pod tissue and from the inoculation droplets as discussed by the authors.
31 citations
TL;DR: In this article, the activities of three key enzymes of the phenylpropanoid and isoflavonoid pathways, phenylalanine ammonia lyase, chalcone synthase, and chalancone isomerase, were determined in resistant and susceptible callus lines of lucerne (Medicago sativa L.) following challenge with the fungus Verticillium albo-atrum at 20 °C.
31 citations
TL;DR: Exogenous application to the leaves of scopoletin, medicarpin and pisatin lead to a reduction of the different fungal growth stages, confirming a role for these phytoalexins in BTH- and BABA-induced resistance against U. pisi hampering pre- and postpenetration fungal stages.
Abstract: Systemic acquired resistance elicitors, BTH and BABA, reduce rust penetration in pea through phytoalexins pathway but differing in their mode of action.
It has been previously shown that rust (Uromyces pisi) infection can be reduced in pea (Pisum sativum) by exogenous applications of systemic acquired resistance elicitors such as BTH and BABA. This protection is known to be related with the induction of the phenolic pathway but the particular metabolites involved have not been determined yet. In this work, we tackled the changes induced in phytoalexin content by BTH and BABA treatments in the context of the resistance responses to pea rust. Detailed analysis through high-performance liquid chromatography (HPLC) showed qualitative and quantitative differences in the content, as well as in the distribution of phytoalexins. Thus, following BTH treatment, we observed an increase in scopoletin, pisatin and medicarpin contents in all, excreted, soluble and cell wall-bound fraction. This suggests fungal growth impairment by both direct toxic effect as well as plant cell wall reinforcement. The response mediated by BTH was genotype-dependent, since coumarin accumulation was observed only in the resistant genotype whereas treatment by BABA primed phytoalexin accumulation in both genotypes equally. Exogenous application to the leaves of scopoletin, medicarpin and pisatin lead to a reduction of the different fungal growth stages, confirming a role for these phytoalexins in BTH- and BABA-induced resistance against U. pisi hampering pre- and postpenetration fungal stages.
31 citations
TL;DR: An endogenous elicitor of the phytoalexin of soybean, was synthesized by way of highly stereoselective glycosylations that involved Glycosyl fluorides as the donors and oxidation of the twelve primary hydroxyl groups in the alpha-(1----4)-linked galactododecaoside derivative.
31 citations