Low red/far - red ratios reduce arabidopsis resistance to Botrytis cinerea and jasmonate responses via a COI1 - JAZ10 - dependent, salicylic acid - independent mechanism
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.
| Main Authors: | , , , , , , , , |
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| Format: | Texto biblioteca |
| Language: | spa |
| Subjects: | 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, CYCLOPENTANES, DOWN-REGULATION, GENE EXPRESSION REGULATION, PLANT, GENES, PLANT, NUCLEAR PROTEINS, OXYLIPINS, PHENOLS, PLANT DISEASES, ARABIDOPSIS THALIANA, BOTRYOTINIA FUCKELIANA, FUNGI, |
| Online Access: | http://ceiba.agro.uba.ar/cgi-bin/koha/opac-detail.pl?biblionumber=46549 |
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