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UVR8 mediates UV - B - induced arabidopsis defense responses against botrytis cinerea by controlling sinapate accumulation

Por: Demkura, Patricia Verónica.
Colaborador(es): Ballaré, Carlos Luis.
ISSN: 1674-2052.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): DEFENSE | JASMONATE | PHENOLICS | PHENYLPROPANOIDS | PHOTOMORPHOGENESIS | PHOTORECEPTOR | PLANT-MICROBE INTERACTIONS | ARABIDOPSIS PROTEIN | CAMALEXIN | COUMARIC ACID | CYCLOPENTANE DERIVATIVE | GLUCOSINOLATE | INDOLE DERIVATIVE | JASMONIC ACID | NONHISTONE PROTEIN | OXYLIPIN | PHENOL DERIVATIVE | SINAPIC ACID | THIAZOLE DERIVATIVE | UVR8 PROTEIN, ARABIDOPSIS | ARABIDOPSIS | BOTRYTIS | CHEMISTRY | DISEASE RESISTANCE | DRUG EFFECT | GENE EXPRESSION REGULATION | GENETICS | IMMUNOLOGY | METABOLISM | MICROBIOLOGY | MUTATION | PHYSIOLOGY | RADIATION EXPOSURE | SIGNAL TRANSDUCTION | ULTRAVIOLET RADIATION | ARABIDOPSIS PROTEINS | CHROMOSOMAL PROTEINS, NON-HISTONE | COUMARIC ACIDS | CYCLOPENTANES | DISEASE RESISTANCE | GLUCOSINOLATES | INDOLES | PHENOLS | PLANT DISEASES | THIAZOLES | ULTRAVIOLET RAYS | BOTRYOTINIA FUCKELIANA | FUNGI | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Molecular Plant vol.5, no.3 (2012), p.642-652Resumen: Light is emerging as a central regulator of plant immune responses against herbivores and pathogens. Solar UV-B radiation plays an important role as a positive modulator of plant defense. However, since UV-B photons can interact with a wide spectrum of molecular targets in plant tissues, the mechanisms that mediate their effects on plant defense have remained elusive. Here, we show that ecologically meaningful doses of UV-B radiation increase Arabidopsis resistance to the necrotrophic fungus Botrytis cinerea and that this effect is mediated by the photoreceptor UVR8. The UV-B effect on plant resistance was conserved in mutants impaired in jasmonate [JA] signaling [jar1-1 and P35S:JAZ10.4] or metabolism of tryptophan-derived defense compounds [pen2-1, pad3-1, pen2 pad3], suggesting that neither regulation of the JA pathway nor changes in levels of indolic glucosinolates [iGS] or camalexin are involved in this response. UV-B radiation, acting through UVR8, increased the levels of flavonoids and sinapates in leaf tissue. The UV-B effect on pathogen resistance was still detectable in tt4-1, a mutant deficient in chalcone synthase and therefore impaired in the synthesis of flavonoids, but was absent in fah1-7, a mutant deficient in ferulic acid 5-hydroxylase, which is essential for sinapate biosynthesis. Collectively, these results indicate that UVR8 plays an important role in mediating the effects of UV-B radiation on pathogen resistance by controlling the expression of the sinapate biosynthetic pathway.
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Light is emerging as a central regulator of plant immune responses against herbivores and pathogens. Solar UV-B radiation plays an important role as a positive modulator of plant defense. However, since UV-B photons can interact with a wide spectrum of molecular targets in plant tissues, the mechanisms that mediate their effects on plant defense have remained elusive. Here, we show that ecologically meaningful doses of UV-B radiation increase Arabidopsis resistance to the necrotrophic fungus Botrytis cinerea and that this effect is mediated by the photoreceptor UVR8. The UV-B effect on plant resistance was conserved in mutants impaired in jasmonate [JA] signaling [jar1-1 and P35S:JAZ10.4] or metabolism of tryptophan-derived defense compounds [pen2-1, pad3-1, pen2 pad3], suggesting that neither regulation of the JA pathway nor changes in levels of indolic glucosinolates [iGS] or camalexin are involved in this response. UV-B radiation, acting through UVR8, increased the levels of flavonoids and sinapates in leaf tissue. The UV-B effect on pathogen resistance was still detectable in tt4-1, a mutant deficient in chalcone synthase and therefore impaired in the synthesis of flavonoids, but was absent in fah1-7, a mutant deficient in ferulic acid 5-hydroxylase, which is essential for sinapate biosynthesis. Collectively, these results indicate that UVR8 plays an important role in mediating the effects of UV-B radiation on pathogen resistance by controlling the expression of the sinapate biosynthetic pathway.

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