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 results suggest that soybean cells respond to the glucan elicitor by major metabolic changes at the RNA level including the enhanced capacity for phytoalexin synthesis, as indicated by two-dimensional electrophoresis of the translation products.
46 citations
TL;DR: In this article, desoxyhemigossypol (dHG) and hemigossymol (HG), a phyto-alexin, were identified as part of the foliar resistance response to Xanthomonas campestris pv.
46 citations
TL;DR: Results indicate that GSH elicits the formation not only of the pterocarpan phytoalexins medicarpin and maackiain, but also that of the constitutive isoflavones biochanin A and formononetin and, in seedlings older than 4 d, that ofthe isoflavanones homoferreirin and cicerin.
45 citations
01 May 1990
TL;DR: The genotype/strain specific occurrence of the hypersensitive response in root nodules resembles the race/cultivar specific incompatibility of several plant-pathogen interactions and points out the close physiological relationship between the late stages of the root nodule symbiosis and a plant/pathogen interaction.
Abstract: Three Glycine genotypes, G. max cv. Williams, G. soja PI 468397, and G. soja PI 342434 in combination with the two rhizobial strains Bradyrhizobium japonicum USDA 123 and Rhizobium fredii USDA 193 were analysed for phytoalexin concentration in the nodules. In the nodules of PI 468397/B. japonicum USDA 123 a very strong glyceollin I accumulation occurred around 30 d.p.i. Ultrastructural analysis of these nodules revealed several symptoms of a severe plant defense response associated with plant cell death (hypersensitive reaction): The cytoplasm of the infected cells was degraded and organelles had vanished. The cell walls of the infected cells showed remarkable thickening. This plant defense response could only be observed in this strain/genotype interaction. The same strain did not elicit a phytoalexin accumulation in the other plant genotypes tested, indicating that this response occurs at the genotype-specific level. This special character of G. soja PI 468397 is heritable as indicated by glyceollin I analysis of the nodules formed by F1 hybrids of PI 468397xWilliams inoculated with B. japonicum USDA 123. The genotype/strain specific occurrence of the hypersensitive response in root nodules resembles the race/cultivar specific incompatibility of several plant-pathogen interactions. This specificity, together with the phenomenon of the HR itself, points out the close physiological relationship between the late stages of the root nodule symbiosis and a plant/pathogen interaction.
45 citations
TL;DR: The data indicate that infection hyphase of C. lindemuthianum remain viable at HR sites on P. vulgaris, and support the conclusion that phytoalexin accumulation is a major feature of HR and a determinant of resistance in this host-parasite system.
45 citations