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

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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 mechani...

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Detalles Bibliográficos
Autor principal: Demkura, Patricia Verónica
Otros Autores: Ballaré, Carlos Luis
Formato: Artículo
Lenguaje:Inglés
Materias:
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
GLUCOSINOLATES
INDOLES
PHENOLS
PLANT DISEASES
THIAZOLES
ULTRAVIOLET RAYS
BOTRYOTINIA FUCKELIANA
FUNGI
Acceso en línea:http://ri.agro.uba.ar/files/intranet/articulo/2012Demkura.pdf
LINK AL EDITOR
Aporte de:Registro referencial: Solicitar el recurso aquí
Biblioteca Central (FAUBA) de Universidad de Buenos Aires
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520 |a 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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