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The transcriptional regulator BBX24 impairs della activity to promote shade avoidance in Arabidopsis thaliana

Colaborador(es): Crocco, Carlos Daniel | Locascio, Antonella | Escudero, Cristian M | Alabadí, David | Blázquez, Miguel A | Botto, Javier Francisco.
ISSN: 2041-1723.Tipo de material: Artículos y capítulos. Recurso electrónico.Tema(s): | WHITE LIGHT | UPREGULATION | UNCLASSIFIED DRUG | TRANSIENT EXPRESSION | TRANSCRIPTION FACTOR BBX24 | TRANSCRIPTION FACTOR | STRESS | SIGNALING | SIGNAL TRANSDUCTION | SHADE TOLERANCE | SHADE | SEEDLING | SECONDARY METABOLISM | REVERSE TRANSCRIPTION POLYMERASE CHAIN REACTION | PROTEIN PROTEIN INTERACTION | PROTEIN FUNCTION | PROTEIN DEGRADATION | PROTEIN | PROMOTER REGION | PLANT GROWTH | PHOTOPERIODICITY | PHENOTYPE | NONHUMAN | NICOTIANA BENTHAMIANA | MOLECULAR ANALYSIS | LIGHT QUALITY | LIGHT EFFECT | HORMONE METABOLISM | HERB | GLUCOCORTICOID RECEPTOR | GIBBERELLIN | GENOTYPE | GENE REPRESSION | GENE CONTROL | ETHYLENE | EPIDERMIS CELL | DNA BINDING | DELLA PROTEIN | CONTROLLED STUDY | CIRCADIAN RHYTHM | CHROMATIN IMMUNOPRECIPITATION | CELL EXPANSION | BRASSINOSTEROID | BIODEGRADATION | AUXIN TRANSPORT | AUXIN | ARABIDOPSIS THALIANA | ALLELE | Recursos en línea: Haga clic para acceso en línea | LINK AL EDITOR En: Nature Communications Vol.6, 6202 (2015) 10 p.Resumen: In response to canopy shade, plant vegetative structures elongate to gain access to light. However, the mechanism that allows a plastic transcriptional response to canopy shade light is not fully elucidated. Here we propose that the activity of PIF4, a key transcription factor in the shade signalling network, is modulated by the interplay between the BBX24 transcriptional regulator and DELLA proteins, which are negative regulators of the gibberellin [GA] signalling pathway. We show that GA-related targets are enriched among genes responsive to BBX24 under shade and that the shade-response defect in bbx24 mutants is rescued by a GA treatment that promotes DELLA degradation. BBX24 physically interacts with DELLA proteins and alleviates DELLA-mediated repression of PIF4 activity. The proposed molecular mechanism provides reversible regulation of the activity of a key transcription factor that may prove especially relevant under fluctuating light conditions.
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In response to canopy shade, plant vegetative structures elongate to gain access to light. However, the mechanism that allows a plastic transcriptional response to canopy shade light is not fully elucidated. Here we propose that the activity of PIF4, a key transcription factor in the shade signalling network, is modulated by the interplay between the BBX24 transcriptional regulator and DELLA proteins, which are negative regulators of the gibberellin [GA] signalling pathway. We show that GA-related targets are enriched among genes responsive to BBX24 under shade and that the shade-response defect in bbx24 mutants is rescued by a GA treatment that promotes DELLA degradation. BBX24 physically interacts with DELLA proteins and alleviates DELLA-mediated repression of PIF4 activity. The proposed molecular mechanism provides reversible regulation of the activity of a key transcription factor that may prove especially relevant under fluctuating light conditions.

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