Arana, MV.; Marín De La Rosa, NA.; Maloof, JN.; Blazquez Rodriguez, MA.; Alabadí Diego, D. (2011). Circadian oscillation of gibberellin signalling in Arabidopsis. Proceedings of the National Academy of Sciences. 108(22):9292-9297. https://doi.org/10.1073/pnas.1101050108
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/81870
Title:
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Circadian oscillation of gibberellin signalling in Arabidopsis
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Author:
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Arana, María Verónica
Marín de la Rosa, Nora Alicia
Maloof, Jurin N.
Blazquez Rodriguez, Miguel Angel
Alabadí Diego, David
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UPV Unit:
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Universitat Politècnica de València. Instituto Universitario Mixto de Biología Molecular y Celular de Plantas - Institut Universitari Mixt de Biologia Molecular i Cel·lular de Plantes
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Issued date:
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Abstract:
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[EN] Circadian clocks are endogenous timekeeping mechanisms that allow organisms to anticipate rhythmic, daily environmental changes. Temporal coordination of transcription results in a set of gene expression patterns with ...[+]
[EN] Circadian clocks are endogenous timekeeping mechanisms that allow organisms to anticipate rhythmic, daily environmental changes. Temporal coordination of transcription results in a set of gene expression patterns with peak levels occurring at precise times of the day. An intriguing question is how a single clock can generate different oscillatory rhythms, and it has been proposed that hormone signaling might act in plants as a relay mechanism to modulate the amplitude and the phase of output rhythms. Here we show that the circadian clock gates gibberellin (GA) signaling through transcriptional regulation of the GA receptors, resulting in higher stability of DELLA proteins during daytime and higher GA sensitivity at night. Oscillation of GA signaling appears to be particularly critical for rhythmic growth, given that constitutive expression of the GA receptor expands the daily growth period in seedlings, and complete loss of DELLA function causes continuous, arrhythmic hypocotyl growth. Moreover, transcriptomic analysis of a pentuple della KO mutant indicates that the GA pathway mediates the rhythmic expression of many clock-regulated genes related to biotic and abiotic stress responses and cell wall modification. Thus, gating of GA sensitivity by the circadian clock represents an additional layer of regulation that might provide extra robustness to the diurnal growth rhythm and constitute a regulatory module that coordinates the circadian clock with additional endogenous and environmental signals.
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Subjects:
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Crosstalk
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Plasticity
,
Light
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Photoperiod
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Copyrigths:
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Reserva de todos los derechos
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Source:
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Proceedings of the National Academy of Sciences. (issn:
0027-8424
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DOI:
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10.1073/pnas.1101050108
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Publisher:
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National Academy of Sciences
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Publisher version:
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http://doi.org/10.1073/pnas.1101050108
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Project ID:
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info:eu-repo/grantAgreement/MEC//CSD2007-00057/ES/Función y potencial biotecnológico de los factores de transcripción de las plantas./ /
info:eu-repo/grantAgreement/NSF//0820854/US/Elucidating Gene Networks Regulating Development in Tomato/
info:eu-repo/grantAgreement/NSF//0923752/US/Agroecological Annotation of Gene Function and Computational Analysis of Gene Networks/
info:eu-repo/grantAgreement/GVA//ACOMP%2F2010%2F190/
info:eu-repo/grantAgreement/MICINN//BIO2010-15071/ES/SEÑALIZACION POR GIBERELINAS DEPENDIENTE DEL CONTEXTO EN ARABIDOPSIS/
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Thanks:
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We are indebted to the Nottingham Arabidopsis Stock Centre, Stephen G. Thomas, Tai-ping Sun, and Nicholas P. Harberd for providing us with seeds. M. V. A. was the recipient of a postdoctoral contract from the Spanish ...[+]
We are indebted to the Nottingham Arabidopsis Stock Centre, Stephen G. Thomas, Tai-ping Sun, and Nicholas P. Harberd for providing us with seeds. M. V. A. was the recipient of a postdoctoral contract from the Spanish Ministry of Science and Innovation for the mobility of young researchers into Spanish universities. N.A.M. holds a Consejo Superior de Investigaciones Cientificas Fellowship of the JAE-Pre program. This study was supported by Spanish Ministry of Science and Innovation Grants BIO2007-60923, BIO2010-15071, and CSD2007-00057; Generalitat Valenciana Grants ACOMP/2010/190; and National Science Foundation Grants DBI0820854 and IOS0923752.
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Type:
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Artículo
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