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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01 Jan 1989TL;DR: Evidence suggesting that these three physiological activities of pectic enzymes may be regulated by factors such as endo-polygalacturonase inhibiting proteins (PGIP) and pH is presented.
Abstract: Microbial pectic enzymes not only macerate plant tissue but also kill plant cells and elicit synthesis and accumulation of phytoalexins (Hahn et al., 1988). We have evidence suggesting that these three physiological activities of pectic enzymes may be regulated by factors such as endo-polygalacturonase inhibiting proteins (PGIP) and pH.
12 citations
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12 citations
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TL;DR: In this paper, a cassane-type diterpene, designated phytocassane E, was isolated and identified as 1β-hydroxy-12,15-cassadien-3,11-dione.
Abstract: Large amounts of phytoalexins were produced in suspension-cultured rice cells by treatment with a mycelial extract of the potato pathogenic fungus Phytophthora infestans. Among them, a new cassane-type diterpene, designated phytocassane E, was isolated and identified as 1β-hydroxy-12,15-cassadien-3,11-dione. The ED50 values of phytocassane E in the prevention of spore germination and germ tube growth of the rice pathogenic fungus Magnaporthe grisea were 6 and 2 μg ml−1, respectively. This result, together with earlier results, suggests that the hydroxyl group at the C-1 position is the main functional moiety for the high antifungal activity of phytocassane E.
12 citations
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TL;DR: Bioassays of HBQ and its hydroquinone established that the quinone is considerably more toxic to V. dahliae than is the Hydroquinone, which apparently represents a detoxification mechanism employed by the pathogen.
Abstract: o-Hibiscanone (HBQ) is a phytoalexin produced by kenaf in response to infection by the wilt pathogen Verticillium dahliae In several bioassays utilizing both conidia and mycelia of V dahliae, HBQ
11 citations
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TL;DR: In this paper, a reversed phase high-performance liquid chromatographic analysis of cruciferous phytoalexins, antimicrobial compounds synthesized de novo by plants after exposure to microorganisms, was performed using an acetonitrile-methanol-water complex solvent gradient system.
11 citations