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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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Journal ArticleDOI
TL;DR: The hypothesis that the two amides of Magnaporthe oryzae inoculation are rice phytoalexins is strongly supported, as it is confirmed that N -benzoyltyramine and N -cinnamoyltryptamine also accumulated after M. oryzAE -inoculated rice leaves.

15 citations

Book ChapterDOI
Robert Fluhr1, Guido Sessa1, A. Sharon1, Naomi Ori1, Tamar Lotan1 
01 Jan 1991
TL;DR: A novel endo-(1-4)-β-xylanase purified from fungal filtrates of Trichoderma viride was found to be a strong activator of PR proteins synthesis in tobacco leaves highlighting a novel ethylene independent pathway for PR proteins.
Abstract: Antisera to acidic isoforms of pathogenesis-related (PR) proteins were used to measure the activity of these genes in tobacco plants. A novel endo-(1-4)-β-xylanase purified from fungal filtrates of Trichoderma viride was found to be a strong activator of PR proteins synthesis in tobacco leaves. The induction was not inhibited by blockers of either ethylene biosynthesis or ethylene action highlighting a novel ethylene independent pathway for PR proteins. Concomitant with the induction of PR proteins phytoalexins are induced. The regulation of the phytoalexin capsidiol showed identical ethylene dependent and independent pathways described for PR proteins.

15 citations

Journal ArticleDOI
TL;DR: Exogenous NO2 triggers basal pathogen resistance, pointing to a possible role for endogenous NO2 in defense signaling and the involvement of jasmonate catabolism and volatiles in pathogen immunity.
Abstract: Nitrogen dioxide (NO2) forms in plants under stress conditions, but little is known about its physiological functions. Here, we explored the physiological functions of NO2 in plant cells using short-term fumigation of Arabidopsis (Arabidopsis thaliana) for 1 h with 10 µL L-1 NO2. Although leaf symptoms were absent, the expression of genes related to pathogen resistance was induced. Fumigated plants developed basal disease resistance, or pattern-triggered immunity, against the necrotrophic fungus Botrytis cinerea and the hemibiotrophic bacterium Pseudomonas syringae Functional salicylic acid and jasmonic acid (JA) signaling pathways were both required for the full expression of NO2-induced resistance against B. cinerea An early peak of salicylic acid accumulation immediately after NO2 exposure was followed by a transient accumulation of oxophytodienoic acid. The simultaneous NO2-induced expression of genes involved in jasmonate biosynthesis and jasmonate catabolism resulted in the complete suppression of JA and JA-isoleucine (JA-Ile) accumulation, which was accompanied by a rise in the levels of their catabolic intermediates 12-OH-JA, 12-OH-JA-Ile, and 12-COOH-JA-Ile. NO2-treated plants emitted the volatile monoterpene α-pinene and the sesquiterpene longifolene (syn. junipene), which could function in signaling or direct defense against pathogens. NO2-triggered B. cinerea resistance was dependent on enhanced early callose deposition and CYTOCHROME P450 79B2 (CYP79B2), CYP79B3, and PHYTOALEXIN DEFICIENT3 gene functions but independent of camalexin, CYP81F2, and 4-OH-indol-3-ylmethylglucosinolate derivatives. In sum, exogenous NO2 triggers basal pathogen resistance, pointing to a possible role for endogenous NO2 in defense signaling. Additionally, this study revealed the involvement of jasmonate catabolism and volatiles in pathogen immunity.

15 citations


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Performance
Metrics
No. of papers in the topic in previous years
YearPapers
202321
202256
202119
202013
201922
201815