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: Phytoalexin accumulation in response to infection by three isolates of Botytis cinerea differing in virulence, and to HgCl2 treatment, was studied in hypocotyls of two Phaseolus vulgaris cultivars with different degrees of susceptibility to the parasite.
Abstract: Phytoalexin accumulation in response to infection by three isolates of Botytis cinerea differing in virulence, and to HgCl 2 treatment, was studied in hypocotyls of two Phaseolus vulgaris cultivars with different degrees of susceptibility to the parasite. When infected by B. cinerea the combined yield of phytoalexins was always higher in the less susceptible cultivar; it was also highest in lesions produced by the least virulent B. cinerea isolate and lowest in lesions of the most virulent one. When challenged with HgCl 2 the yield of phytoalexins was the same in both cultivars, the accumulation patterns being different from the B. cinerea case. These data are discussed in relation to current theories about the role of phytoalexins in host-parasite interactions.
11 citations
TL;DR: Deposition of reaction material (papillae) and phytoalexin accumulation were detected in narcissus bulb scales undergoing resistant reactions following inoculation with conidia of Botrytis cinerea or B. narcissicola, and it was suggested that reaction material contained lignin and callose and that surrounding cell walls were also lignified.
Abstract: Deposition of reaction material (papillae) and phytoalexin accumulation were detected in narcissus bulb scales undergoing resistant reactions following inoculation with conidia of Botrytis cinerea or B. narcissicola, or mycelium of B. cinerea. Histochemical staining and micro-autoradiography suggested that reaction material contained lignin and callose and that surrounding cell walls were also lignified. Twelve phytoalexins were isolated from tissue bearing limited lesions and found to comprise two groups of structurally related compounds. The smoulder pathogen B. narcissicola was as sensitive to the inhibitors as non-pathogenic species of Botrytis. Neither phytoalexin accumulation nor lignification were detected in bulb tissue during the formation of spreading lesions caused by B. narcissicola. The role of lignification and phytoalexin accumulation in the resistance of narcissus bulbs to Botrytis is discussed.
11 citations
TL;DR: Metabolites and viable cells of Pseudomonas corrugata from liquid culture medium elicited biosynthesis of the phytoalexin medicarpin in ladino white clover leaflets and callus.
Abstract: Metabolites and viable cells of Pseudomonas corrugata from liquid culture medium elicited biosynthesis of the phytoalexin medicarpin in ladino white clover (Trifolium repens) leaflets and callus. The biologically active elicitor components were soluble in 80% ethanol. They were partially purified by removing components greater than 3,500 Da by dialysis and fractionating by preparative reversed-phase high-performance liquid chromatogrpahy (HPLC). None of the four fractions separated by HPLC elicited appreciable quantities of medicarpin in callus, but fraction 1 combined with fraction 4 elicited high concentrations of medicarpin (...)
11 citations
TL;DR: It is suggested that the methylation inhibitor tubericidin selectively inhibits the accumulation of isoflavones, with the flavone and licodione accumulating as alternative phytoalexins.
11 citations
TL;DR: Compounds with UV spectra corresponding to isoflavanones were almost exclusively synthesized in response to abiotic elicitors but in leaves infected with fungal pathogens formononetin, daidzein and medicarpin were present as minor components.
11 citations