Gallego Bartolomé, J.; Kami, C.; Fankhauser, C.; Alabadí Diego, D.; Blazquez Rodriguez, MA. (2011). A hormonal regulatory module that provides flexibility to tropic responses. Plant Physiology. 156(4):1819-1825. https://doi.org/10.1104/pp.111.173971
Por favor, use este identificador para citar o enlazar este ítem: http://hdl.handle.net/10251/84994
Title:
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A hormonal regulatory module that provides flexibility to tropic responses
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Author:
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Gallego Bartolomé, Javier
Kami, C
Fankhauser, Christian
Alabadí Diego, David
Blazquez Rodriguez, Miguel Angel
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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] Plants orient their growth depending on directional stimuli such as light and gravity, in a process known as tropic response. Tropisms result from asymmetrical accumulation of auxin across the responding organ relative ...[+]
[EN] Plants orient their growth depending on directional stimuli such as light and gravity, in a process known as tropic response. Tropisms result from asymmetrical accumulation of auxin across the responding organ relative to the direction of the stimulus, which causes differential growth rates on both sides of the organ. Here, we show that gibberellins (GAs) attenuate the gravitropic reorientation of stimulated hypocotyls of dark-grown Arabidopsis (Arabidopsis thaliana) seedlings. We show that the modulation occurs through induction of the expression of the negative regulator of auxin signaling INDOLE-3-ACETIC ACID INDUCIBLE19/MASSUGU2. The biological significance of this regulatory mechanism involving GAs and auxin seems to be the maintenance of a high degree of flexibility in tropic responses. This notion is further supported by observations that GA-deficient seedlings showed a much lower variance in the response to gravity compared to wild-type seedlings and that the attenuation of gravitropism by GAs resulted in an increased phototropic response. This suggests that the interplay between auxin and GAs may be particularly important for plant orientation under competing tropic stimuli.
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Subjects:
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Hypocotyl growth orientation
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Della protein function
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Arabidopsis thaliana
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Auxin transport
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Differential growth
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Signaling pathways
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Plant tropisms
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Phytochrome-A
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Blue light
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Phototropism
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Copyrigths:
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Reserva de todos los derechos
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Source:
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Plant Physiology. (issn:
0032-0889
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DOI:
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10.1104/pp.111.173971
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Publisher:
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American Society of Plant Biologists
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Publisher version:
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http://doi.org/10.1104/pp.111.173971
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Project ID:
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info:eu-repo/grantAgreement/MEC//BIO2007-60923/ES/MECANISMO DE CONTROL DE LA FOTOMORFOGENESIS POR GIBERELINAS EN ARABIDOPSIS/ /
info:eu-repo/grantAgreement/SNSF//3100A0_112638/
info:eu-repo/grantAgreement/SNSF//31003A_124747/CH/Photoreceptor-mediated control of directional shoot-growth in Arabidopsis/
info:eu-repo/grantAgreement/MICINN//BIO2010-15071/ES/SEÑALIZACION POR GIBERELINAS DEPENDIENTE DEL CONTEXTO EN ARABIDOPSIS/
info:eu-repo/grantAgreement/MEC//CSD2007-00057/ES/Función y potencial biotecnológico de los factores de transcripción de las plantas/
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Thanks:
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This work was supported by the Spanish Ministry of Science and Innovation (grant nos. BIO2007-60923, BIO2010-15071, and CONSOLIDER2007-00057), and the Swiss National Science Foundation (grant nos. 3100A0_112638 and ...[+]
This work was supported by the Spanish Ministry of Science and Innovation (grant nos. BIO2007-60923, BIO2010-15071, and CONSOLIDER2007-00057), and the Swiss National Science Foundation (grant nos. 3100A0_112638 and 31003A_124747/1). J.G.-B. is the recipient of a fellowship from the Consejo Superior de Investigaciones Cientificas.
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Type:
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Artículo
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