The bHLH proteins BEE and BIM positively modulate the shade avoidance syndrome in Arabidopsis seedlings
| Autor: | Cifuentes-Esquivel N (1), Bou-Torrent J (1), Galstyan A (1), Gallemí M (1), Sessa G (2), Salla Martret M (1), Roig-Villanova I (1), Ruberti I (2), Martínez-García JF (1 |
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| Přispěvatelé: | Consejo Superior de Investigaciones Científicas (España), Ministerio de Economía y Competitividad (España), Ministerio de Educación y Ciencia (España), Gobierno de Chile, Ministero dell'Economia e delle Finanze, Generalitat de Catalunya, European Commission |
| Jazyk: | angličtina |
| Rok vydání: | 2013 |
| Předmět: |
Arabidopsis thaliana
Light Arabidopsis Plant Science transcriptional co-factors Shade avoidance chemistry.chemical_compound shade avoidance syndrome Gene Expression Regulation Plant Brassinosteroids Botany Gene expression Basic Helix-Loop-Helix Transcription Factors Genetics Brassinosteroid Transcription factor BEEs and BIMs biology Phytochrome Basic helix-loop-helix Arabidopsis Proteins hypocotyl elongation fungi Nuclear Proteins food and beverages Cell Biology biology.organism_classification PAR1 Hypocotyl Cell biology DNA-Binding Proteins chemistry Seedlings basic helix-loop-helix Mutation |
| Zdroj: | Digital.CSIC. Repositorio Institucional del CSIC instname Plant journal (Online) 75 (2013): 989–1002. doi:10.1111/tpj.12264 info:cnr-pdr/source/autori:Cifuentes-Esquivel N (1), Bou-Torrent J (1), Galstyan A (1), Gallemí M (1), Sessa G (2), Salla Martret M (1), Roig-Villanova I (1), Ruberti I (2), Martínez-García JF (1,3)/titolo:The bHLH proteins BEE and BIM positively modulate the shade avoidance syndrome in Arabidopsis seedlings/doi:10.1111%2Ftpj.12264/rivista:Plant journal (Online)/anno:2013/pagina_da:989/pagina_a:1002/intervallo_pagine:989–1002/volume:75 |
| DOI: | 10.1111/tpj.12264 |
| Popis: | The shade avoidance syndrome (SAS) refers to a set of plant responses initiated after perception by the phytochromes of light with a reduced red to far-red ratio, indicative of vegetation proximity or shade. These responses, including elongation growth, anticipate eventual shading from potential competitor vegetation by overgrowing neighboring plants or flowering to ensure production of viable seeds for the next generation. In Arabidopsis thaliana seedlings, the SAS includes dramatic changes in gene expression, such as induction of PHYTOCHROME RAPIDLY REGULATED 1 (PAR1), encoding an atypical basic helix-loop-helix (bHLH) protein that acts as a transcriptional co-factor to repress hypocotyl elongation. Indeed, PAR1 has been proposed to act fundamentally as a dominant negative antagonist of conventional bHLH transcription factors by forming heterodimers with them to prevent their binding to DNA or other transcription factors. Here we report the identification of PAR1-interacting factors, including the brassinosteroid signaling components BR-ENHANCED EXPRESSION (BEE) and BES1-INTERACTING MYC-LIKE (BIM), and characterize their role as networked positive regulators of SAS hypocotyl responses. We provide genetic evidence that these bHLH transcriptional regulators not only control plant growth and development under shade and non-shade conditions, but are also redundant in the control of plant viability. Our results suggest that SAS responses are initiated as a consequence of a new balance of transcriptional regulators within the pre-existing bHLH network triggered by plant proximity, eventually causing hypocotyls to elongate. Fellowships or contracts were provided by CSIC (J.B.–T. and M.S.–M.), the Ministerio de Educación (A.G.), the Ministerio de Economía y Competitividad (I.R.–V, and M.G.) and the Gobierno de Chile (N.C.–E.). Research in our laboratories is supported by grants to I.R. from the Italian Ministry of Economy and Finance (Project FaReBio di Qualità) and to J.F.M.–G.'s laboratory (XRB, 2009-SGR697 from the Generalitat de Catalunya and CSD2007-00036, BIO2005-00154, BIO2008-00169 and BIO2011-23489 from Ministerio de Economía y Competitividad/Fondo Europeo de Desarrollo Regional funds). |
| Databáze: | OpenAIRE |
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