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Low red/far - red ratios reduce arabidopsis resistance to Botrytis cinerea and jasmonate responses via a COI1 - JAZ10 - dependent, salicylic acid - independent mechanism

Colaborador(es): Cerrudo, Ignacio | Keller, Mercedes M | Cargnel, Miriam D | Demkura, Patricia Verónica | de Wit, Mieke | Patitucci, Micaela Soledad | Pierik, Ronald | Pieterse, Corne M. J | Ballaré, Carlos Luis.
ISSN: 0032-0889.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): ANTHOCYANIN | ARABIDOPSIS PROTEIN | COI1 PROTEIN, ARABIDOPSIS | CYCLOPENTANE DERIVATIVE | JAS1 PROTEIN, ARABIDOPSIS | JASMONIC ACID | NUCLEAR PROTEIN | OXYLIPIN | PHENOL DERIVATIVE | PHYB PROTEIN, ARABIDOPSIS | PHYTOCHROME B | SALICYLIC ACID | ARABIDOPSIS | BOTRYTIS | DISEASE RESISTANCE | DOWN REGULATION | DRUG EFFECT | GENE EXPRESSION REGULATION | GENETICS | IMMUNOLOGY | LIGHT | METABOLISM | MICROBIOLOGY | MUTATION | PHENOTYPE | PHYSIOLOGY | PLANT GENE | RADIATION EXPOSURE | SIGNAL TRANSDUCTION | ANTHOCYANINS | ARABIDOPSIS PROTEINS | BOTRYTIS | CYCLOPENTANES | DISEASE RESISTANCE | DOWN-REGULATION | GENE EXPRESSION REGULATION, PLANT | GENES, PLANT | LIGHT | NUCLEAR PROTEINS | OXYLIPINS | PHENOLS | PHYTOCHROME B | PLANT DISEASES | SALICYLIC ACID | SIGNAL TRANSDUCTION | ARABIDOPSIS THALIANA | BOTRYOTINIA FUCKELIANA | FUNGI | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR. En: Plant Physiology vol.158, no.4 (2012), p.2042-2052Resumen: Light is an important modulator of plant immune responses. Here, we show that inactivation of the photoreceptor phytochrome B [phyB] by a low red/far-red ratio [R:FR], which is a signal of competition in plant canopies, down-regulates the expression of defense markers induced by the necrotrophic fungus Botrytis cinerea, including the genes that encode the transcription factor ETHYLENE RESPONSE FACTOR1 [ERF1] and the plant defensin PLANT DEFENSIN1.2 [PDF1.2]. This effect of low R:FR correlated with a reduced sensitivity to jasmonate [JA], thus resembling the antagonistic effects of salicylic acid [SA] on JA responses. Low R:FR failed to depress PDF1.2 mRNA levels in a transgenic line in which PDF1.2 transcription was up-regulated by constitutive expression of ERF1 in a coronatine insensitive1 [coi1] mutant background [35S::ERF1/coi1]. These results suggest that the low R:FR effect, in contrast to the SA effect, requires a functional SCF COI1-JASMONATE ZIMDOMAIN [JAZ] JA receptor module. Furthermore, the effect of low R:FR depressing the JA response was conserved in mutants impaired in SA signaling [sid2-1 and npr1-1]. Plant exposure to low R:FR ratios and the phyB mutation markedly increased plant susceptibility to B. cinerea; the effect of low R:FR was [1] independent of the activation of the shade-avoidance syndrome, [2] conserved in the sid2-1 and npr1-1 mutants, and [3] absent in two RNA interference lines disrupted for the expression of the JAZ10 gene. Collectively, our results suggest that low R:FR ratios depress Arabidopsis [Arabidopsis thaliana] immune responses against necrotrophic microorganisms via a SA-independent mechanism that requires the JAZ10 transcriptional repressor and that this effect may increase plant susceptibility to fungal infection in dense canopies.
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Light is an important modulator of plant immune responses. Here, we show that inactivation of the photoreceptor phytochrome B [phyB] by a low red/far-red ratio [R:FR], which is a signal of competition in plant canopies, down-regulates the expression of defense markers induced by the necrotrophic fungus Botrytis cinerea, including the genes that encode the transcription factor ETHYLENE RESPONSE FACTOR1 [ERF1] and the plant defensin PLANT DEFENSIN1.2 [PDF1.2]. This effect of low R:FR correlated with a reduced sensitivity to jasmonate [JA], thus resembling the antagonistic effects of salicylic acid [SA] on JA responses. Low R:FR failed to depress PDF1.2 mRNA levels in a transgenic line in which PDF1.2 transcription was up-regulated by constitutive expression of ERF1 in a coronatine insensitive1 [coi1] mutant background [35S::ERF1/coi1]. These results suggest that the low R:FR effect, in contrast to the SA effect, requires a functional SCF COI1-JASMONATE ZIMDOMAIN [JAZ] JA receptor module. Furthermore, the effect of low R:FR depressing the JA response was conserved in mutants impaired in SA signaling [sid2-1 and npr1-1]. Plant exposure to low R:FR ratios and the phyB mutation markedly increased plant susceptibility to B. cinerea; the effect of low R:FR was [1] independent of the activation of the shade-avoidance syndrome, [2] conserved in the sid2-1 and npr1-1 mutants, and [3] absent in two RNA interference lines disrupted for the expression of the JAZ10 gene. Collectively, our results suggest that low R:FR ratios depress Arabidopsis [Arabidopsis thaliana] immune responses against necrotrophic microorganisms via a SA-independent mechanism that requires the JAZ10 transcriptional repressor and that this effect may increase plant susceptibility to fungal infection in dense canopies.

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