1
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Andres J, Schmunk LJ, Grau-Enguix F, Braguy J, Samodelov SL, Blomeier T, Ochoa-Fernandez R, Weber W, Al-Babili S, Alabadí D, Blázquez MA, Zurbriggen MD. Ratiometric gibberellin biosensors for the analysis of signaling dynamics and metabolism in plant protoplasts. Plant J 2024; 118:927-939. [PMID: 38525669 DOI: 10.1111/tpj.16725] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2021] [Revised: 03/04/2024] [Accepted: 03/08/2024] [Indexed: 03/26/2024]
Abstract
Gibberellins (GAs) are major regulators of developmental and growth processes in plants. Using the degradation-based signaling mechanism of GAs, we have built transcriptional regulator (DELLA)-based, genetically encoded ratiometric biosensors as proxies for hormone quantification at high temporal resolution and sensitivity that allow dynamic, rapid and simple analysis in a plant cell system, i.e. Arabidopsis protoplasts. These ratiometric biosensors incorporate a DELLA protein as a degradation target fused to a firefly luciferase connected via a 2A peptide to a renilla luciferase as a co-expressed normalization element. We have implemented these biosensors for all five Arabidopsis DELLA proteins, GA-INSENSITIVE, GAI; REPRESSOR-of-ga1-3, RGA; RGA-like1, RGL1; RGL2 and RGL3, by applying a modular design. The sensors are highly sensitive (in the low pm range), specific and dynamic. As a proof of concept, we have tested the applicability in three domains: the study of substrate specificity and activity of putative GA-oxidases, the characterization of GA transporters, and the use as a discrimination platform coupled to a GA agonists' chemical screening. This work demonstrates the development of a genetically encoded quantitative biosensor complementary to existing tools that allow the visualization of GA in planta.
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Affiliation(s)
- Jennifer Andres
- Institute of Synthetic Biology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Lisa J Schmunk
- Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Federico Grau-Enguix
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia, Spain
| | - Justine Braguy
- Institute of Synthetic Biology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
- The BioActives Lab, Division of Biological and Environmental Science and Engineering, Center for Desert Agriculture, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - Sophia L Samodelov
- Institute of Synthetic Biology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Tim Blomeier
- Institute of Synthetic Biology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Rocio Ochoa-Fernandez
- Institute of Synthetic Biology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
| | - Wilfried Weber
- Signalling Research Centres BIOSS and CIBSS and Faculty of Biology, University of Freiburg, Freiburg, Germany
| | - Salim Al-Babili
- The BioActives Lab, Division of Biological and Environmental Science and Engineering, Center for Desert Agriculture, King Abdullah University of Science and Technology (KAUST), Thuwal, Saudi Arabia
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia, Spain
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia, Spain
| | - Matias D Zurbriggen
- Institute of Synthetic Biology, Heinrich-Heine-Universität Düsseldorf, Düsseldorf, Germany
- CEPLAS-Cluster of Excellence on Plant Sciences, Düsseldorf, Germany
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2
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Blanco-Touriñán N, Pérez-Alemany J, Bourbousse C, Latrasse D, Ait-Mohamed O, Benhamed M, Barneche F, Blázquez MA, Gallego-Bartolomé J, Alabadí D. The plant POLYMERASE-ASSOCIATED FACTOR1 complex links transcription and H2B monoubiquitination genome wide. Plant Physiol 2024; 195:640-651. [PMID: 38285074 PMCID: PMC11060679 DOI: 10.1093/plphys/kiae041] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/27/2023] [Revised: 12/20/2023] [Accepted: 12/25/2023] [Indexed: 01/30/2024]
Abstract
The evolutionarily conserved POLYMERASE-ASSOCIATED FACTOR1 complex (Paf1C) participates in transcription, and research in animals and fungi suggests that it facilitates RNA POLYMERASE II (RNAPII) progression through chromatin. We examined the genomic distribution of the EARLY FLOWERING7 (ELF7) and VERNALIZATION INDEPENDENCE3 subunits of Paf1C in Arabidopsis (Arabidopsis thaliana). The occupancy of both subunits was confined to thousands of gene bodies and positively associated with RNAPII occupancy and the level of gene expression, supporting a role as a transcription elongation factor. We found that monoubiquitinated histone H2B, which marks most transcribed genes, was strongly reduced genome wide in elf7 seedlings. Genome-wide profiling of RNAPII revealed that in elf7 mutants, RNAPII occupancy was reduced throughout the gene body and at the transcription end site of Paf1C-targeted genes, suggesting a direct role for the complex in transcription elongation. Overall, our observations suggest a direct functional link between Paf1C activity, monoubiquitination of histone H2B, and the transition of RNAPII to productive elongation. However, for several genes, Paf1C may also act independently of H2Bub deposition or occupy these genes more stable than H2Bub marking, possibly reflecting the dynamic nature of Paf1C association and H2Bub turnover during transcription.
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Affiliation(s)
- Noel Blanco-Touriñán
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022 Valencia, Spain
| | - Jaime Pérez-Alemany
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022 Valencia, Spain
| | - Clara Bourbousse
- Ecole Normale Supérieure, Institut de Biologie de l'Ecole Normale Supérieure (CNRS), CNRS, INSERM, Université PSL, 75230 Paris, France
| | - David Latrasse
- Institute of Plant Sciences Paris-Saclay (Université Paris-Saclay-CNRS), 91190 Gif-sur-Yvette, France
| | - Ouardia Ait-Mohamed
- Ecole Normale Supérieure, Institut de Biologie de l'Ecole Normale Supérieure (CNRS), CNRS, INSERM, Université PSL, 75230 Paris, France
| | - Moussa Benhamed
- Institute of Plant Sciences Paris-Saclay (Université Paris-Saclay-CNRS), 91190 Gif-sur-Yvette, France
| | - Fredy Barneche
- Ecole Normale Supérieure, Institut de Biologie de l'Ecole Normale Supérieure (CNRS), CNRS, INSERM, Université PSL, 75230 Paris, France
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022 Valencia, Spain
| | | | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022 Valencia, Spain
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3
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Heslop-Harrison G, Nakabayashi K, Espinosa-Ruiz A, Robertson F, Baines R, Thompson CRL, Hermann K, Alabadí D, Leubner-Metzger G, Williams RSB. Functional mechanism study of the allelochemical myrigalone A identifies a group of ultrapotent inhibitors of ethylene biosynthesis in plants. Plant Commun 2024:100846. [PMID: 38460510 DOI: 10.1016/j.xplc.2024.100846] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/24/2023] [Revised: 12/21/2023] [Accepted: 02/14/2024] [Indexed: 03/11/2024]
Abstract
Allelochemicals represent a class of natural products released by plants as root, leaf, and fruit exudates that interfere with the growth and survival of neighboring plants. Understanding how allelochemicals function to regulate plant responses may provide valuable new approaches to better control plant function. One such allelochemical, Myrigalone A (MyA) produced by Myrica gale, inhibits seed germination and seedling growth through an unknown mechanism. Here, we investigate MyA using the tractable model Dictyostelium discoideum and reveal that its activity depends on the conserved homolog of the plant ethylene synthesis protein 1-aminocyclopropane-1-carboxylic acid oxidase (ACO). Furthermore, in silico modeling predicts the direct binding of MyA to ACO within the catalytic pocket. In D. discoideum, ablation of ACO mimics the MyA-dependent developmental delay, which is partially restored by exogenous ethylene, and MyA reduces ethylene production. In Arabidopsis thaliana, MyA treatment delays seed germination, and this effect is rescued by exogenous ethylene. It also mimics the effect of established ACO inhibitors on root and hypocotyl extension, blocks ethylene-dependent root hair production, and reduces ethylene production. Finally, in silico binding analyses identify a range of highly potent ethylene inhibitors that block ethylene-dependent response and reduce ethylene production in Arabidopsis. Thus, we demonstrate a molecular mechanism by which the allelochemical MyA reduces ethylene biosynthesis and identify a range of ultrapotent inhibitors of ethylene-regulated responses.
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Affiliation(s)
- George Heslop-Harrison
- Centre for Biomedical Sciences, Department of Biological Sciences, Royal Holloway University of London, Egham TW20 0EX, UK
| | - Kazumi Nakabayashi
- Centre for Plant Molecular Sciences, Department of Biological Sciences, Royal Holloway University of London, Egham TW20 0EX, UK
| | - Ana Espinosa-Ruiz
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022 Valencia, Spain
| | - Francesca Robertson
- Centre for Biomedical Sciences, Department of Biological Sciences, Royal Holloway University of London, Egham TW20 0EX, UK; Centre for Plant Molecular Sciences, Department of Biological Sciences, Royal Holloway University of London, Egham TW20 0EX, UK
| | - Robert Baines
- Centre for Life's Origins and Evolution, Department of Genetics, Evolution and Environment, University College London, London, UK
| | - Christopher R L Thompson
- Centre for Life's Origins and Evolution, Department of Genetics, Evolution and Environment, University College London, London, UK
| | | | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022 Valencia, Spain
| | - Gerhard Leubner-Metzger
- Centre for Plant Molecular Sciences, Department of Biological Sciences, Royal Holloway University of London, Egham TW20 0EX, UK
| | - Robin S B Williams
- Centre for Biomedical Sciences, Department of Biological Sciences, Royal Holloway University of London, Egham TW20 0EX, UK.
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4
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Gómez-Mínguez Y, Palacios-Abella A, Costigliolo-Rojas C, Barber M, Hernández-Villa L, Úrbez C, Alabadí D. The prefoldin-like protein AtURI exhibits characteristics of intrinsically disordered proteins. FEBS Lett 2024; 598:556-570. [PMID: 38302844 DOI: 10.1002/1873-3468.14811] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/06/2023] [Revised: 12/26/2023] [Accepted: 12/27/2023] [Indexed: 02/03/2024]
Abstract
The prefoldin-like protein UNCONVENTIONAL PREFOLDIN RPB5 INTERACTOR (URI) participates in diverse cellular functions, including protein homeostasis, transcription, translation, and signal transduction. Thus, URI is a highly versatile protein, although the molecular basis of this versatility remains unknown. In this work, we show that Arabidopsis thaliana (Arabidopsis) URI (AtURI) possesses a large intrinsically disordered region (IDR) spanning most of the C-terminal part of the protein, a feature conserved in yeast and human orthologs. Our findings reveal two key characteristics of disordered proteins in AtURI: promiscuity in interacting with partners and protein instability. We propose that these two features contribute to providing AtURI with functional versatility.
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Affiliation(s)
- Yaiza Gómez-Mínguez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), Valencia, Spain
| | | | | | | | | | - Cristina Úrbez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), Valencia, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), Valencia, Spain
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5
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Wong C, Alabadí D, Blázquez MA. Spatial regulation of plant hormone action. J Exp Bot 2023; 74:6089-6103. [PMID: 37401809 PMCID: PMC10575700 DOI: 10.1093/jxb/erad244] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/04/2023] [Accepted: 06/30/2023] [Indexed: 07/05/2023]
Abstract
Although many plant cell types are capable of producing hormones, and plant hormones can in most cases act in the same cells in which they are produced, they also act as signaling molecules that coordinate physiological responses between different parts of the plant, indicating that their action is subject to spatial regulation. Numerous publications have reported that all levels of plant hormonal pathways, namely metabolism, transport, and perception/signal transduction, can help determine the spatial ranges of hormone action. For example, polar auxin transport or localized auxin biosynthesis contribute to creating a differential hormone accumulation across tissues that is instrumental for specific growth and developmental responses. On the other hand, tissue specificity of cytokinin actions has been proposed to be regulated by mechanisms operating at the signaling stages. Here, we review and discuss current knowledge about the contribution of the three levels mentioned above in providing spatial specificity to plant hormone action. We also explore how new technological developments, such as plant hormone sensors based on FRET (fluorescence resonance energy transfer) or single-cell RNA-seq, can provide an unprecedented level of resolution in defining the spatial domains of plant hormone action and its dynamics.
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Affiliation(s)
- Cynthia Wong
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022-Valencia, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022-Valencia, Spain
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022-Valencia, Spain
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6
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Pereyra ME, Costigliolo Rojas C, Jarrell AF, Hovland AS, Snipes SA, Nagpal P, Alabadí D, Blázquez MA, Gutiérrez RA, Reed JW, Gray WM, Casal JJ. PIF4 enhances the expression of SAUR genes to promote growth in response to nitrate. Proc Natl Acad Sci U S A 2023; 120:e2304513120. [PMID: 37725643 PMCID: PMC10523462 DOI: 10.1073/pnas.2304513120] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Grants] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/18/2023] [Accepted: 08/09/2023] [Indexed: 09/21/2023] Open
Abstract
Nitrate supply is fundamental to support shoot growth and crop performance, but the associated increase in stem height exacerbates the risks of lodging and yield losses. Despite their significance for agriculture, the mechanisms involved in the promotion of stem growth by nitrate remain poorly understood. Here, we show that the elongation of the hypocotyl of Arabidopsis thaliana, used as a model, responds rapidly and persistently to upshifts in nitrate concentration, rather than to the nitrate level itself. The response occurred even in shoots dissected from their roots and required NITRATE TRANSPORTER 1.1 (NRT1.1) in the phosphorylated state (but not NRT1.1 nitrate transport capacity) and NIN-LIKE PROTEIN 7 (NLP7). Nitrate increased PHYTOCHROME INTERACTING FACTOR 4 (PIF4) nuclear abundance by posttranscriptional mechanisms that depended on NRT1.1 and phytochrome B. In response to nitrate, PIF4 enhanced the expression of numerous SMALL AUXIN-UP RNA (SAUR) genes in the hypocotyl. The growth response to nitrate required PIF4, positive and negative regulators of its activity, including AUXIN RESPONSE FACTORs, and SAURs. PIF4 integrates cues from the soil (nitrate) and aerial (shade) environments adjusting plant stature to facilitate access to light.
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Affiliation(s)
- Matías Ezequiel Pereyra
- Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Facultad de Agronomía, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires1417, Argentina
- Fundaciόn Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires1405, Argentina
| | - Cecilia Costigliolo Rojas
- Fundaciόn Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires1405, Argentina
| | - Anne F. Jarrell
- Department of Biology, University of North Carolina, Chapel Hill, NC27599-3280
| | - Austin S. Hovland
- Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN55108
| | - Stephen A. Snipes
- Department of Biology, University of North Carolina, Chapel Hill, NC27599-3280
| | - Punita Nagpal
- Department of Biology, University of North Carolina, Chapel Hill, NC27599-3280
| | - David Alabadí
- Instituto de Biologίa Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas, Universidad Politécnica de Valencia, Valencia46022, Spain
| | - Miguel A. Blázquez
- Instituto de Biologίa Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas, Universidad Politécnica de Valencia, Valencia46022, Spain
| | - Rodrigo A. Gutiérrez
- Departamento de Genética Molecular y Microbiología, Facultad de Ciencias Biológicas, Pontificia Universidad Católica de Chile, Santiago8331150, Chile
| | - Jason W. Reed
- Department of Biology, University of North Carolina, Chapel Hill, NC27599-3280
| | - William M. Gray
- Department of Plant and Microbial Biology, University of Minnesota, St. Paul, MN55108
| | - Jorge José Casal
- Instituto de Investigaciones Fisiológicas y Ecológicas Vinculadas a la Agricultura, Facultad de Agronomía, Universidad de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires1417, Argentina
- Fundaciόn Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires1405, Argentina
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7
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Briones-Moreno A, Hernández-García J, Vargas-Chávez C, Blanco-Touriñán N, Phokas A, Úrbez C, Cerdán PD, Coates JC, Alabadí D, Blázquez MA. DELLA functions evolved by rewiring of associated transcriptional networks. Nat Plants 2023; 9:535-543. [PMID: 36914897 DOI: 10.1038/s41477-023-01372-6] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/23/2022] [Accepted: 02/13/2023] [Indexed: 06/18/2023]
Abstract
DELLA proteins are land-plant specific transcriptional regulators that transduce environmental information to multiple processes throughout a plant's life1-3. The molecular basis for this critical function in angiosperms has been linked to the regulation of DELLA stability by gibberellins and to the capacity of DELLA proteins to interact with hundreds of transcription factors4,5. Although bryophyte orthologues can partially fulfil functions attributed to angiosperm DELLA6,7, it is not clear whether the capacity to establish interaction networks is an ancestral property of DELLA proteins or is associated with their role in gibberellin signalling8-10. Here we show that representative DELLAs from the main plant lineages display a conserved ability to interact with multiple transcription factors. We propose that promiscuity was encoded in the ancestral DELLA protein, and that this property has been largely maintained, whereas the lineage-dependent diversification of DELLA-dependent functions mostly reflects the functional evolution of their interacting partners.
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Affiliation(s)
- Asier Briones-Moreno
- Instituto de Biología Molecular y Celular de Plantas (CSIC-U Politècnica de València), Valencia, Spain
| | - Jorge Hernández-García
- Instituto de Biología Molecular y Celular de Plantas (CSIC-U Politècnica de València), Valencia, Spain
- Laboratory of Biochemistry, Wageningen University, Wageningen, the Netherlands
| | | | - Noel Blanco-Touriñán
- Instituto de Biología Molecular y Celular de Plantas (CSIC-U Politècnica de València), Valencia, Spain
| | | | - Cristina Úrbez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-U Politècnica de València), Valencia, Spain
| | - Pablo D Cerdán
- Fundación Instituto Leloir, Consejo Nacional de Investigaciones Científicas y Técnicas, Buenos Aires, Argentina
| | - Juliet C Coates
- School of Biosciences, University of Birmingham, Birmingham, UK
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-U Politècnica de València), Valencia, Spain
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-U Politècnica de València), Valencia, Spain.
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8
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Mateos JL, Sanchez SE, Legris M, Esteve-Bruna D, Torchio JC, Petrillo E, Goretti D, Blanco-Touriñán N, Seymour DK, Schmid M, Weigel D, Alabadí D, Yanovsky MJ. PICLN modulates alternative splicing and light/temperature responses in plants. Plant Physiol 2023; 191:1036-1051. [PMID: 36423226 PMCID: PMC9922395 DOI: 10.1093/plphys/kiac527] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/14/2022] [Accepted: 10/01/2022] [Indexed: 06/16/2023]
Abstract
Plants undergo transcriptome reprograming to adapt to daily and seasonal fluctuations in light and temperature conditions. While most efforts have focused on the role of master transcription factors, the importance of splicing factors modulating these processes is now emerging. Efficient pre-mRNA splicing depends on proper spliceosome assembly, which in plants and animals requires the methylosome complex. Ion Chloride nucleotide-sensitive protein (PICLN) is part of the methylosome complex in both humans and Arabidopsis (Arabidopsis thaliana), and we show here that the human PICLN ortholog rescues phenotypes of Arabidopsis picln mutants. Altered photomorphogenic and photoperiodic responses in Arabidopsis picln mutants are associated with changes in pre-mRNA splicing that partially overlap with those in PROTEIN ARGININE METHYL TRANSFERASE5 (prmt5) mutants. Mammalian PICLN also acts in concert with the Survival Motor Neuron (SMN) complex component GEMIN2 to modulate the late steps of UsnRNP assembly, and many alternative splicing events regulated by PICLN but not PRMT5, the main protein of the methylosome, are controlled by Arabidopsis GEMIN2. As with GEMIN2 and SM PROTEIN E1/PORCUPINE (SME1/PCP), low temperature, which increases PICLN expression, aggravates morphological and molecular defects of picln mutants. Taken together, these results establish a key role for PICLN in the regulation of pre-mRNA splicing and in mediating plant adaptation to daily and seasonal fluctuations in environmental conditions.
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Affiliation(s)
- Julieta L Mateos
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1405BWE, Argentina
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE-UBA-CONICET) and Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires C1428EHA, Argentina
- RNA Biology and Molecular Physiology, Faculty of Biology, Bielefeld University, Biele-feld 33615, Germany
| | - Sabrina E Sanchez
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1405BWE, Argentina
| | - Martina Legris
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1405BWE, Argentina
- Department of Molecular Biology, Max Planck Institute for Biology Tübingen, Tübingen 72076, Germany
| | - David Esteve-Bruna
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politecnica de Valencia), Valencia 46022, Spain
| | - Jeanette C Torchio
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1405BWE, Argentina
| | - Ezequiel Petrillo
- Instituto de Fisiología, Biología Molecular y Neurociencias (IFIBYNE-UBA-CONICET) and Facultad de Ciencias Exactas y Naturales, Universidad de Buenos Aires, Ciudad Universitaria, Buenos Aires C1428EHA, Argentina
| | - Daniela Goretti
- Department of Plant Physiology, Umea Plant Science Centre, Umea University, Umea SE-901 87, Sweden
| | - Noel Blanco-Touriñán
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politecnica de Valencia), Valencia 46022, Spain
| | - Danelle K Seymour
- Department of Molecular Biology, Max Planck Institute for Biology Tübingen, Tübingen 72076, Germany
| | - Markus Schmid
- Department of Plant Physiology, Umea Plant Science Centre, Umea University, Umea SE-901 87, Sweden
| | - Detlef Weigel
- Department of Molecular Biology, Max Planck Institute for Biology Tübingen, Tübingen 72076, Germany
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politecnica de Valencia), Valencia 46022, Spain
| | - Marcelo J Yanovsky
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires–Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET), Buenos Aires C1405BWE, Argentina
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9
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Diego-Martin B, Pérez-Alemany J, Candela-Ferre J, Corbalán-Acedo A, Pereyra J, Alabadí D, Jami-Alahmadi Y, Wohlschlegel J, Gallego-Bartolomé J. The TRIPLE PHD FINGERS proteins are required for SWI/SNF complex-mediated +1 nucleosome positioning and transcription start site determination in Arabidopsis. Nucleic Acids Res 2022; 50:10399-10417. [PMID: 36189880 PMCID: PMC9561266 DOI: 10.1093/nar/gkac826] [Citation(s) in RCA: 8] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2022] [Revised: 09/08/2022] [Accepted: 09/16/2022] [Indexed: 11/14/2022] Open
Abstract
Eukaryotes have evolved multiple ATP-dependent chromatin remodelers to shape the nucleosome landscape. We recently uncovered an evolutionarily conserved SWItch/Sucrose Non-Fermentable (SWI/SNF) chromatin remodeler complex in plants reminiscent of the mammalian BAF subclass, which specifically incorporates the MINUSCULE (MINU) catalytic subunits and the TRIPLE PHD FINGERS (TPF) signature subunits. Here we report experimental evidence that establishes the functional relevance of TPF proteins for the complex activity. Our results show that depletion of TPF triggers similar pleiotropic phenotypes and molecular defects to those found in minu mutants. Moreover, we report the genomic location of MINU2 and TPF proteins as representative members of this SWI/SNF complex and their impact on nucleosome positioning and transcription. These analyses unravel the binding of the complex to thousands of genes where it modulates the position of the +1 nucleosome. These targets tend to produce 5′-shifted transcripts in the tpf and minu mutants pointing to the participation of the complex in alternative transcription start site usage. Interestingly, there is a remarkable correlation between +1 nucleosome shift and 5′ transcript length change suggesting their functional connection. In summary, this study unravels the function of a plant SWI/SNF complex involved in +1 nucleosome positioning and transcription start site determination.
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Affiliation(s)
- Borja Diego-Martin
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), CSIC-Universitat Politècnica de València, Valencia, 46022, Spain
| | - Jaime Pérez-Alemany
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), CSIC-Universitat Politècnica de València, Valencia, 46022, Spain
| | - Joan Candela-Ferre
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), CSIC-Universitat Politècnica de València, Valencia, 46022, Spain
| | - Antonio Corbalán-Acedo
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), CSIC-Universitat Politècnica de València, Valencia, 46022, Spain
| | - Juan Pereyra
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), CSIC-Universitat Politècnica de València, Valencia, 46022, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), CSIC-Universitat Politècnica de València, Valencia, 46022, Spain
| | - Yasaman Jami-Alahmadi
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, CA, 90095, USA
| | - James Wohlschlegel
- Department of Biological Chemistry, David Geffen School of Medicine, University of California, Los Angeles, CA, 90095, USA
| | - Javier Gallego-Bartolomé
- Instituto de Biología Molecular y Celular de Plantas (IBMCP), CSIC-Universitat Politècnica de València, Valencia, 46022, Spain
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10
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Blanco-Touriñán N, Esteve-Bruna D, Serrano-Mislata A, Esquinas-Ariza RM, Resentini F, Forment J, Carrasco-López C, Novella-Rausell C, Palacios-Abella A, Carrasco P, Salinas J, Blázquez MÁ, Alabadí D. Erratum to: A genetic approach reveals different modes of action of prefoldins. Plant Physiol 2021; 187:2879. [PMID: 34618122 PMCID: PMC8644470 DOI: 10.1093/plphys/kiab416] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Download PDF] [Subscribe] [Scholar Register] [Indexed: 06/13/2023]
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11
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Blanco-Touriñán N, Esteve-Bruna D, Serrano-Mislata A, Esquinas-Ariza RM, Resentini F, Forment J, Carrasco-López C, Novella-Rausell C, Palacios-Abella A, Carrasco P, Salinas J, Blázquez MÁ, Alabadí D. A genetic approach reveals different modes of action of prefoldins. Plant Physiol 2021; 187:1534-1550. [PMID: 34618031 PMCID: PMC8566299 DOI: 10.1093/plphys/kiab348] [Citation(s) in RCA: 3] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 04/30/2021] [Accepted: 07/05/2021] [Indexed: 05/25/2023]
Abstract
The prefoldin complex (PFDc) was identified in humans as a co-chaperone of the cytosolic chaperonin T-COMPLEX PROTEIN RING COMPLEX (TRiC)/CHAPERONIN CONTAINING TCP-1 (CCT). PFDc is conserved in eukaryotes and is composed of subunits PFD1-6, and PFDc-TRiC/CCT folds actin and tubulins. PFDs also participate in a wide range of cellular processes, both in the cytoplasm and in the nucleus, and their malfunction causes developmental alterations and disease in animals and altered growth and environmental responses in yeast and plants. Genetic analyses in yeast indicate that not all of their functions require the canonical complex. The lack of systematic genetic analyses in plants and animals, however, makes it difficult to discern whether PFDs participate in a process as the canonical complex or in alternative configurations, which is necessary to understand their mode of action. To tackle this question, and on the premise that the canonical complex cannot be formed if one subunit is missing, we generated an Arabidopsis (Arabidopsis thaliana) mutant deficient in the six PFDs and compared various growth and environmental responses with those of the individual mutants. In this way, we demonstrate that the PFDc is required for seed germination, to delay flowering, or to respond to high salt stress or low temperature, whereas at least two PFDs redundantly attenuate the response to osmotic stress. A coexpression analysis of differentially expressed genes in the sextuple mutant identified several transcription factors, including ABA INSENSITIVE 5 (ABI5) and PHYTOCHROME-INTERACTING FACTOR 4, acting downstream of PFDs. Furthermore, the transcriptomic analysis allowed assigning additional roles for PFDs, for instance, in response to higher temperature.
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Affiliation(s)
- Noel Blanco-Touriñán
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - David Esteve-Bruna
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Antonio Serrano-Mislata
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Rosa María Esquinas-Ariza
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Francesca Resentini
- Dipartimento di Bioscienze, Università degli Studi di Milano, 20133 Milano, Italy
| | - Javier Forment
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Cristian Carrasco-López
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas Margarita Salas (CSIC), 28040 Madrid, Spain
| | - Claudio Novella-Rausell
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Alberto Palacios-Abella
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Pedro Carrasco
- Departament de Bioquímica i Biologia Molecular, Universitat de València, 46100 Burjassot, Spain
| | - Julio Salinas
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas Margarita Salas (CSIC), 28040 Madrid, Spain
| | - Miguel Á Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
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12
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Blanco-Touriñán N, Alabadí D. Gibberellin signaling turns blue. Mol Plant 2021; 14:1226-1228. [PMID: 34166846 DOI: 10.1016/j.molp.2021.06.013] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/31/2021] [Revised: 06/18/2021] [Accepted: 06/19/2021] [Indexed: 06/13/2023]
Affiliation(s)
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), 46022 Valencia, Spain.
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13
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Esteve-Bruna D, Carrasco-López C, Blanco-Touriñán N, Iserte J, Calleja-Cabrera J, Perea-Resa C, Úrbez C, Carrasco P, Yanovsky MJ, Blázquez MA, Salinas J, Alabadí D. Prefoldins contribute to maintaining the levels of the spliceosome LSM2-8 complex through Hsp90 in Arabidopsis. Nucleic Acids Res 2020; 48:6280-6293. [PMID: 32396196 PMCID: PMC7293050 DOI: 10.1093/nar/gkaa354] [Citation(s) in RCA: 13] [Impact Index Per Article: 3.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/21/2019] [Revised: 04/23/2020] [Accepted: 04/27/2020] [Indexed: 02/06/2023] Open
Abstract
Although originally identified as the components of the complex aiding the cytosolic chaperonin CCT in the folding of actins and tubulins in the cytosol, prefoldins (PFDs) are emerging as novel regulators influencing gene expression in the nucleus. Work conducted mainly in yeast and animals showed that PFDs act as transcriptional regulators and participate in the nuclear proteostasis. To investigate new functions of PFDs, we performed a co-expression analysis in Arabidopsis thaliana. Results revealed co-expression between PFD and the Sm-like (LSM) genes, which encode the LSM2–8 spliceosome core complex, in this model organism. Here, we show that PFDs interact with and are required to maintain adequate levels of the LSM2–8 complex. Our data indicate that levels of the LSM8 protein, which defines and confers the functional specificity of the complex, are reduced in pfd mutants and in response to the Hsp90 inhibitor geldanamycin. We provide biochemical evidence showing that LSM8 is a client of Hsp90 and that PFD4 mediates the interaction between both proteins. Consistent with our results and with the role of the LSM2–8 complex in splicing through the stabilization of the U6 snRNA, pfd mutants showed reduced levels of this snRNA and altered pre-mRNA splicing patterns.
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Affiliation(s)
- David Esteve-Bruna
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Cristian Carrasco-López
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas "Margarita Salas" (CSIC), 28040 Madrid, Spain
| | - Noel Blanco-Touriñán
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Javier Iserte
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, CONICET, C1405BWAE Buenos Aires, Argentina
| | - Julián Calleja-Cabrera
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Carlos Perea-Resa
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas "Margarita Salas" (CSIC), 28040 Madrid, Spain
| | - Cristina Úrbez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Pedro Carrasco
- Departament de Bioquímica i Biologia Molecular, Universitat de València, 46100 Burjassot, Spain
| | - Marcelo J Yanovsky
- Fundación Instituto Leloir, Instituto de Investigaciones Bioquímicas de Buenos Aires, CONICET, C1405BWAE Buenos Aires, Argentina
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
| | - Julio Salinas
- Departamento de Biotecnología Microbiana y de Plantas, Centro de Investigaciones Biológicas "Margarita Salas" (CSIC), 28040 Madrid, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), 46022 Valencia, Spain
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14
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Aliaga-Franco N, Zhang C, Presa S, Srivastava AK, Granell A, Alabadí D, Sadanandom A, Blázquez MA, Minguet EG. Identification of Transgene-Free CRISPR-Edited Plants of Rice, Tomato, and Arabidopsis by Monitoring DsRED Fluorescence in Dry Seeds. Front Plant Sci 2019; 10:1150. [PMID: 31620160 PMCID: PMC6759815 DOI: 10.3389/fpls.2019.01150] [Citation(s) in RCA: 20] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/10/2019] [Accepted: 08/23/2019] [Indexed: 05/18/2023]
Abstract
Efficient elimination of the editing machinery remains a challenge in plant biotechnology after genome editing to minimize the probability of off-target mutations, but it is also important to deliver end users with edited plants free of foreign DNA. Using the modular cloning system Golden Braid, we have included a fluorescence-dependent transgene monitoring module to the genome-editing tool box. We have tested this approach in Solanum lycopersicum, Oryza sativa, and Arabidopsis thaliana. We demonstrate that DsRED fluorescence visualization works efficiently in dry seeds as marker for the detection of the transgene in the three species allowing an efficient method for selecting transgene-free dry seeds. In the first generation of DsRED-free CRISPR/Cas9 null segregants, we detected gene editing of selected targets including homozygous mutants for the plant species tested. We demonstrate that this strategy allows rapid selection of transgene-free homozygous edited crop plants in a single generation after in vitro transformation.
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Affiliation(s)
- Norma Aliaga-Franco
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de Valencia, Valencia, Spain
| | - Cunjin Zhang
- Department of Biosciences, Durham University, Durham, United Kingdom
| | - Silvia Presa
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de Valencia, Valencia, Spain
| | | | - Antonio Granell
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de Valencia, Valencia, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de Valencia, Valencia, Spain
| | - Ari Sadanandom
- Department of Biosciences, Durham University, Durham, United Kingdom
| | - Miguel A. Blázquez
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de Valencia, Valencia, Spain
| | - Eugenio G. Minguet
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de Valencia, Valencia, Spain
- *Correspondence: Eugenio G. Minguet,
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15
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Felipo-Benavent A, Úrbez C, Blanco-Touriñán N, Serrano-Mislata A, Baumberger N, Achard P, Agustí J, Blázquez MA, Alabadí D. Regulation of xylem fiber differentiation by gibberellins through DELLA-KNAT1 interaction. Development 2018; 145:dev.164962. [PMID: 30389856 DOI: 10.1242/dev.164962] [Citation(s) in RCA: 18] [Impact Index Per Article: 3.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/23/2018] [Accepted: 10/29/2018] [Indexed: 12/20/2022]
Abstract
The thickening of plant organs is supported by secondary growth, a process by which new vascular tissues (xylem and phloem) are produced. Xylem is composed of several cell types, including xylary fibers, parenchyma and vessel elements. In Arabidopsis, it has been shown that fibers are promoted by the class-I KNOX gene KNAT1 and the plant hormones gibberellins, and are repressed by a small set of receptor-like kinases; however, we lack a mechanistic framework to integrate their relative contributions. Here, we show that DELLAs, negative elements of the gibberellin signaling pathway, physically interact with KNAT1 and impair its binding to KNAT1-binding sites. Our analysis also indicates that at least 37% of the transcriptome mobilized by KNAT1 is potentially dependent on this interaction, and includes genes involved in secondary cell wall modifications and phenylpropanoid biosynthesis. Moreover, the promotion by constitutive overexpression of KNAT1 of fiber formation and the expression of genes required for fiber differentiation were still reverted by DELLA accumulation, in agreement with post-translational regulation of KNAT1 by DELLA proteins. These results suggest that gibberellins enhance fiber development by promoting KNAT1 activity.
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Affiliation(s)
- Amelia Felipo-Benavent
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia 46022, Spain
| | - Cristina Úrbez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia 46022, Spain
| | - Noel Blanco-Touriñán
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia 46022, Spain
| | - Antonio Serrano-Mislata
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia 46022, Spain
| | - Nicolas Baumberger
- Institut de Biologie Moléculaire des Plantes (CNRS-Université de Strasbourg), Strasbourg 67084, France
| | - Patrick Achard
- Institut de Biologie Moléculaire des Plantes (CNRS-Université de Strasbourg), Strasbourg 67084, France
| | - Javier Agustí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia 46022, Spain
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia 46022, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia 46022, Spain
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16
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Martín G, Rovira A, Veciana N, Soy J, Toledo-Ortiz G, Gommers CM, Boix M, Henriques R, Minguet EG, Alabadí D, Halliday KJ, Leivar P, Monte E. Circadian Waves of Transcriptional Repression Shape PIF-Regulated Photoperiod-Responsive Growth in Arabidopsis. Curr Biol 2018; 28:311-318.e5. [DOI: 10.1016/j.cub.2017.12.021] [Citation(s) in RCA: 70] [Impact Index Per Article: 11.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 01/15/2017] [Revised: 07/27/2017] [Accepted: 12/08/2017] [Indexed: 02/03/2023]
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17
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Abbas M, Hernández‐García J, Blanco‐Touriñán N, Aliaga N, Minguet EG, Alabadí D, Blázquez MA. Reduction of indole-3-acetic acid methyltransferase activity compensates for high-temperature male sterility in Arabidopsis. Plant Biotechnol J 2018; 16:272-279. [PMID: 28574629 PMCID: PMC5785359 DOI: 10.1111/pbi.12768] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/24/2016] [Revised: 05/23/2017] [Accepted: 05/30/2017] [Indexed: 05/29/2023]
Abstract
High temperature is a general stress factor that causes a decrease in crop yield. It has been shown that auxin application reduces the male sterility caused by exposure to higher temperatures. However, widespread application of a hormone with vast effects on plant physiology may be discouraged in many cases. Therefore, the generation of new plant varieties that locally enhance auxin in reproductive organs may represent an alternative strategy. We have explored the possibility of increasing indole-3-acetic acid (IAA) in ovaries by reducing IAA methyltransferase1 (IAMT1) activity in Arabidopsis thaliana. The iamt1 mutant showed increased auxin signalling in funiculi, which correlated with a higher growth rate of wild-type pollen in contact with mutant ovaries and premature ovule fertilization. While the production of seeds per fruit was similar in the wild type and the mutant at 20 °C, exposure to 29 °C caused a more severe decrease in fertility in the wild type than in the mutant. Loss of IAMT1 activity was also associated with the production of more nodes after flowering and higher tolerance of the shoot apical meristem to higher temperatures. As a consequence, the productivity of the iamt1 mutant under higher temperatures was more than double of that of the wild type, with almost no apparent trade-off.
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Affiliation(s)
- Mohamad Abbas
- Instituto de Biología Molecular y Celular de PlantasConsejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de ValenciaValenciaSpain
- Present address:
Plant and Crop ScienceSutton Bonington CampusUniversity of NottinghamNottinghamUK
| | - Jorge Hernández‐García
- Instituto de Biología Molecular y Celular de PlantasConsejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de ValenciaValenciaSpain
| | - Noel Blanco‐Touriñán
- Instituto de Biología Molecular y Celular de PlantasConsejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de ValenciaValenciaSpain
| | - Norma Aliaga
- Instituto de Biología Molecular y Celular de PlantasConsejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de ValenciaValenciaSpain
| | - Eugenio G. Minguet
- Instituto de Biología Molecular y Celular de PlantasConsejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de ValenciaValenciaSpain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de PlantasConsejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de ValenciaValenciaSpain
| | - Miguel A. Blázquez
- Instituto de Biología Molecular y Celular de PlantasConsejo Superior de Investigaciones Científicas (CSIC)—Universidad Politécnica de ValenciaValenciaSpain
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18
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Lopez-Moya F, Escudero N, Zavala-Gonzalez EA, Esteve-Bruna D, Blázquez MA, Alabadí D, Lopez-Llorca LV. Induction of auxin biosynthesis and WOX5 repression mediate changes in root development in Arabidopsis exposed to chitosan. Sci Rep 2017; 7:16813. [PMID: 29196703 PMCID: PMC5711845 DOI: 10.1038/s41598-017-16874-5] [Citation(s) in RCA: 32] [Impact Index Per Article: 4.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 08/10/2017] [Accepted: 11/16/2017] [Indexed: 01/16/2023] Open
Abstract
Chitosan is a natural polymer with applications in agriculture, which causes plasma membrane permeabilisation and induction of intracellular reactive oxygen species (ROS) in plants. Chitosan has been mostly applied in the phylloplane to control plant diseases and to enhance plant defences, but has also been considered for controlling root pests. However, the effect of chitosan on roots is virtually unknown. In this work, we show that chitosan interfered with auxin homeostasis in Arabidopsis roots, promoting a 2-3 fold accumulation of indole acetic acid (IAA). We observed chitosan dose-dependent alterations of auxin synthesis, transport and signalling in Arabidopsis roots. As a consequence, high doses of chitosan reduce WOX5 expression in the root apical meristem and arrest root growth. Chitosan also propitiates accumulation of salicylic (SA) and jasmonic (JA) acids in Arabidopsis roots by induction of genes involved in their biosynthesis and signalling. In addition, high-dose chitosan irrigation of tomato and barley plants also arrests root development. Tomato root apices treated with chitosan showed isodiametric cells respect to rectangular cells in the controls. We found that chitosan causes strong alterations in root cell morphology. Our results highlight the importance of considering chitosan dose during agronomical applications to the rhizosphere.
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Affiliation(s)
- Federico Lopez-Moya
- Laboratory of Plant Pathology, Multidisciplinary Institute for Environment Studies (MIES) Ramón Margalef, Department of Marine Sciences and Applied Biology, University of Alicante, Alicante, Spain.
| | - Nuria Escudero
- Laboratory of Plant Pathology, Multidisciplinary Institute for Environment Studies (MIES) Ramón Margalef, Department of Marine Sciences and Applied Biology, University of Alicante, Alicante, Spain
- Departament d'Enginyeria Agroalimentària i Biotecnologia, Universitat Politècnica de Catalunya, Barcelona, Spain
| | - Ernesto A Zavala-Gonzalez
- Laboratory of Plant Pathology, Multidisciplinary Institute for Environment Studies (MIES) Ramón Margalef, Department of Marine Sciences and Applied Biology, University of Alicante, Alicante, Spain
- Atlántica Agrícola Company SA. Villena, Alicante, Spain
| | - David Esteve-Bruna
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Valencia, Spain
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Valencia, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Valencia, Spain
| | - Luis V Lopez-Llorca
- Laboratory of Plant Pathology, Multidisciplinary Institute for Environment Studies (MIES) Ramón Margalef, Department of Marine Sciences and Applied Biology, University of Alicante, Alicante, Spain
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19
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Felipo-Benavent A, Blanco-Touriñán N, Martinelli F, Blázquez MA, Alabadí D. New role of sawtooth transcription factors in the shift to photoautotrophic growth in plants. N Biotechnol 2016. [DOI: 10.1016/j.nbt.2015.10.032] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 11/15/2022]
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20
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Abbas M, Hernández-García J, Blázquez MA, Alabadí D. Reduction of IAA methyltransferase activity compensates for high-temperature male sterility in Arabidopsis. N Biotechnol 2016. [DOI: 10.1016/j.nbt.2015.10.058] [Citation(s) in RCA: 0] [Impact Index Per Article: 0] [Reference Citation Analysis] [What about the content of this article? (0)] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/22/2022]
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21
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Marín-de la Rosa N, Pfeiffer A, Hill K, Locascio A, Bhalerao RP, Miskolczi P, Grønlund AL, Wanchoo-Kohli A, Thomas SG, Bennett MJ, Lohmann JU, Blázquez MA, Alabadí D. Genome Wide Binding Site Analysis Reveals Transcriptional Coactivation of Cytokinin-Responsive Genes by DELLA Proteins. PLoS Genet 2015; 11:e1005337. [PMID: 26134422 PMCID: PMC4489807 DOI: 10.1371/journal.pgen.1005337] [Citation(s) in RCA: 79] [Impact Index Per Article: 8.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/09/2014] [Accepted: 06/05/2015] [Indexed: 11/19/2022] Open
Abstract
The ability of plants to provide a plastic response to environmental cues relies on the connectivity between signaling pathways. DELLA proteins act as hubs that relay environmental information to the multiple transcriptional circuits that control growth and development through physical interaction with transcription factors from different families. We have analyzed the presence of one DELLA protein at the Arabidopsis genome by chromatin immunoprecipitation coupled to large-scale sequencing and we find that it binds at the promoters of multiple genes. Enrichment analysis shows a strong preference for cis elements recognized by specific transcription factor families. In particular, we demonstrate that DELLA proteins are recruited by type-B ARABIDOPSIS RESPONSE REGULATORS (ARR) to the promoters of cytokinin-regulated genes, where they act as transcriptional co-activators. The biological relevance of this mechanism is underpinned by the necessity of simultaneous presence of DELLAs and ARRs to restrict root meristem growth and to promote photomorphogenesis. Plants respond to environmental cues by modulating transcriptional circuits. One mechanism for such modulation involves DELLA proteins. They are promiscuous interactors of transcription factors and, in most cases, this interaction impairs the recognition of the DNA target sequences. Here we show that DELLA proteins are also recruited to multiple locations of the genome where they act as transcriptional coactivators, and we demonstrate how physical interaction with type-B ARRs is relevant for the regulation of meristem maintenance and photomorphogenesis.
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Affiliation(s)
- Nora Marín-de la Rosa
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia, Spain
| | - Anne Pfeiffer
- Department of Stem Cell Biology, Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Kristine Hill
- School of Biosciences and Centre for Plant Integrative Biology, University of Nottingham, Nottingham, United Kingdom
| | - Antonella Locascio
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia, Spain
| | - Rishikesh P. Bhalerao
- Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre, Sveriges Lantbruksuniversitet, Umeå, Sweden
- College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Pal Miskolczi
- Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre, Sveriges Lantbruksuniversitet, Umeå, Sweden
| | | | | | | | - Malcolm J. Bennett
- Department of Forest Genetics and Plant Physiology, Umeå Plant Science Centre, Sveriges Lantbruksuniversitet, Umeå, Sweden
- College of Science, King Saud University, Riyadh, Kingdom of Saudi Arabia
| | - Jan U. Lohmann
- Department of Stem Cell Biology, Centre for Organismal Studies Heidelberg, Heidelberg University, Heidelberg, Germany
| | - Miguel A. Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia, Spain
- * E-mail:
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia, Spain
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Abbas M, Berckhan S, Rooney DJ, Gibbs DJ, Vicente Conde J, Sousa Correia C, Bassel GW, Marín-de la Rosa N, León J, Alabadí D, Blázquez MA, Holdsworth MJ. Oxygen sensing coordinates photomorphogenesis to facilitate seedling survival. Curr Biol 2015; 25:1483-8. [PMID: 25981794 PMCID: PMC4454774 DOI: 10.1016/j.cub.2015.03.060] [Citation(s) in RCA: 106] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/03/2015] [Revised: 03/11/2015] [Accepted: 03/31/2015] [Indexed: 12/31/2022]
Abstract
Successful emergence from the soil is essential for plant establishment in natural and farmed systems. It has been assumed that the absence of light in the soil is the preeminent signal perceived during early seedling development, leading to a distinct morphogenic plan (skotomorphogenesis) [1], characterized by traits providing an adaptive advantage until emergence and photomorphogenesis. These traits include suppressed chlorophyll synthesis, promotion of hypocotyl elongation, and formation of a closed apical hook that protects the stem cell niche from damage [2, 3]. However, absence of light by itself is not a sufficient environmental signal for early seedling development [4, 5]. Reduced oxygen levels (hypoxia) can occur in water-logged soils [6–8]. We therefore hypothesized that below-ground hypoxia may be an important, but thus far undiscovered, ecological component regulating seedling development. Here, we show that survival and establishment of seedlings following darkness depend on their ability to sense hypoxia, through enhanced stability of group VII Ethylene Response Factor (ERFVII) transcription factors. Hypoxia is perceived as a positive environmental component in diverse taxa of flowering plants, promoting maintenance of skotomorphogenic traits. Hypoxia greatly enhances survival once light is perceived, while oxygen is necessary for the subsequent effective completion of photomorphogenesis. Together with light perception, oxygen sensing therefore allows an integrated response to the complex and changing physical microenvironment encountered during early seedling growth. We propose that plants monitor the soil’s gaseous environment after germination, using hypoxia as a key external cue to protect the stem cell niche, thus ensuring successful rapid establishment upon emergence above ground. Low oxygen (hypoxia) enhances seedling survival in the dark Hypoxia is sensed by oxygen-mediated degradation of ERFVII transcription factors Stable ERFVIIs enhance dark-activated development and repress light-activated development Plants monitor the gaseous environment to coordinate photomorphogenesis
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Affiliation(s)
- Mohamad Abbas
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas, Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - Sophie Berckhan
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Daniel J Rooney
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Daniel J Gibbs
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK; School of Biosciences, University of Birmingham, Edgbaston B15 2TT, UK
| | - Jorge Vicente Conde
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Cristina Sousa Correia
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - George W Bassel
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK; School of Biosciences, University of Birmingham, Edgbaston B15 2TT, UK
| | - Nora Marín-de la Rosa
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas, Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - José León
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas, Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas, Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas, Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain.
| | - Michael J Holdsworth
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK.
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Resentini F, Felipo-Benavent A, Colombo L, Blázquez MA, Alabadí D, Masiero S. TCP14 and TCP15 mediate the promotion of seed germination by gibberellins in Arabidopsis thaliana. Mol Plant 2015; 8:482-5. [PMID: 25655823 DOI: 10.1016/j.molp.2014.11.018] [Citation(s) in RCA: 95] [Impact Index Per Article: 10.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 11/03/2014] [Accepted: 11/24/2014] [Indexed: 05/04/2023]
Affiliation(s)
- Francesca Resentini
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milano, Italy
| | - Amelia Felipo-Benavent
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Ingeniero Fausto Elio, s/n 46022 Valencia, Spain
| | - Lucia Colombo
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milano, Italy
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Ingeniero Fausto Elio, s/n 46022 Valencia, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Ingeniero Fausto Elio, s/n 46022 Valencia, Spain
| | - Simona Masiero
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milano, Italy.
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24
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Resentini F, Felipo-Benavent A, Colombo L, Blázquez MA, Alabadí D, Masiero S. TCP14 and TCP15 mediate the promotion of seed germination by gibberellins in Arabidopsis thaliana. Mol Plant 2015; 14:1771. [PMID: 25655823 DOI: 10.1016/j.molp.2021.09.012] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/03/2014] [Revised: 11/03/2014] [Accepted: 11/24/2014] [Indexed: 05/25/2023]
Affiliation(s)
- Francesca Resentini
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milano, Italy
| | - Amelia Felipo-Benavent
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Ingeniero Fausto Elio, s/n 46022 Valencia, Spain
| | - Lucia Colombo
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milano, Italy
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Ingeniero Fausto Elio, s/n 46022 Valencia, Spain
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Ingeniero Fausto Elio, s/n 46022 Valencia, Spain
| | - Simona Masiero
- Dipartimento di Bioscienze, Università degli Studi di Milano, via Celoria 26, 20133 Milano, Italy.
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Crocco CD, Locascio A, Escudero CM, Alabadí D, Blázquez MA, Botto JF. The transcriptional regulator BBX24 impairs DELLA activity to promote shade avoidance in Arabidopsis thaliana. Nat Commun 2015; 6:6202. [PMID: 25656233 DOI: 10.1038/ncomms7202] [Citation(s) in RCA: 55] [Impact Index Per Article: 6.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/05/2014] [Accepted: 01/05/2015] [Indexed: 11/08/2022] Open
Abstract
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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Affiliation(s)
- Carlos D Crocco
- IFEVA, Facultad de Agronomía, Universidad de Buenos Aires y Consejo Nacional de Investigaciones Científicas y Técnicas, Avenue San Martín 4453, Buenos Aires C1417DSE, Argentina
| | - Antonella Locascio
- 1] Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Valencia 46022, Spain [2] Department of Agronomy, Food, Natural Resources, Animals and the Environment (DAFNAE), Padova University, Viale dell'Universitá 16, Legnaro 35020, Italy
| | - Cristian M Escudero
- IFEVA, Facultad de Agronomía, Universidad de Buenos Aires y Consejo Nacional de Investigaciones Científicas y Técnicas, Avenue San Martín 4453, Buenos Aires C1417DSE, Argentina
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Valencia 46022, Spain
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Valencia 46022, Spain
| | - Javier F Botto
- IFEVA, Facultad de Agronomía, Universidad de Buenos Aires y Consejo Nacional de Investigaciones Científicas y Técnicas, Avenue San Martín 4453, Buenos Aires C1417DSE, Argentina
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26
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Marín-de la Rosa N, Sotillo B, Miskolczi P, Gibbs DJ, Vicente J, Carbonero P, Oñate-Sánchez L, Holdsworth MJ, Bhalerao R, Alabadí D, Blázquez MA. Large-scale identification of gibberellin-related transcription factors defines group VII ETHYLENE RESPONSE FACTORS as functional DELLA partners. Plant Physiol 2014; 166:1022-32. [PMID: 25118255 PMCID: PMC4213073 DOI: 10.1104/pp.114.244723] [Citation(s) in RCA: 51] [Impact Index Per Article: 5.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/06/2014] [Accepted: 08/06/2014] [Indexed: 05/17/2023]
Abstract
DELLA proteins are the master negative regulators in gibberellin (GA) signaling acting in the nucleus as transcriptional regulators. The current view of DELLA action indicates that their activity relies on the physical interaction with transcription factors (TFs). Therefore, the identification of TFs through which DELLAs regulate GA responses is key to understanding these responses from a mechanistic point of view. Here, we have determined the TF interactome of the Arabidopsis (Arabidopsis thaliana) DELLA protein GIBBERELLIN INSENSITIVE and screened a collection of conditional TF overexpressors in search of those that alter GA sensitivity. As a result, we have found RELATED TO APETALA2.3, an ethylene-induced TF belonging to the group VII ETHYLENE RESPONSE FACTOR of the APETALA2/ethylene responsive element binding protein superfamily, as a DELLA interactor with physiological relevance in the context of apical hook development. The combination of transactivation assays and chromatin immunoprecipitation indicates that the interaction with GIBBERELLIN INSENSITIVE impairs the activity of RELATED TO APETALA2.3 on the target promoters. This mechanism represents a unique node in the cross regulation between the GA and ethylene signaling pathways controlling differential growth during apical hook development.
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Affiliation(s)
- Nora Marín-de la Rosa
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - Berta Sotillo
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - Pal Miskolczi
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - Daniel J Gibbs
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - Jorge Vicente
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - Pilar Carbonero
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - Luis Oñate-Sánchez
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - Michael J Holdsworth
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - Rishikesh Bhalerao
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
| | - Miguel A Blázquez
- Instituto de Biología Molecular y Celular de Plantas, 46022 Valencia, Spain (N.M.-d.l.R., B.S., D.A., M.A.B.);Department of Forest Genetics and Plant Physiology, Umeå Plant Science Center, Swedish University of Agricultural Sciences, 90187 Umea, Sweden (P.M., R.B.);Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, United Kingdom (D.J.G., J.V., M.J.H.);Centro de Biotecnología y Genómica de Plantas, Escuela Técnica Superior de Ingenieros Agrónomos, Universidad Politécnica de Madrid, Campus de Montegancedo, 28223 Pozuelo de Alarcón, Spain (P.C., L.O.-S.); andCollege of Science, King Saud University, Riyadh 11451, Kingdom of Saudi Arabia (R.B.)
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27
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Gibbs DJ, Md Isa N, Movahedi M, Lozano-Juste J, Mendiondo GM, Berckhan S, Marín-de la Rosa N, Vicente Conde J, Sousa Correia C, Pearce SP, Bassel GW, Hamali B, Talloji P, Tomé DFA, Coego A, Beynon J, Alabadí D, Bachmair A, León J, Gray JE, Theodoulou FL, Holdsworth MJ. Nitric oxide sensing in plants is mediated by proteolytic control of group VII ERF transcription factors. Mol Cell 2014; 53:369-79. [PMID: 24462115 PMCID: PMC3969242 DOI: 10.1016/j.molcel.2013.12.020] [Citation(s) in RCA: 241] [Impact Index Per Article: 24.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 10/04/2013] [Revised: 11/14/2013] [Accepted: 12/13/2013] [Indexed: 11/28/2022]
Abstract
Nitric oxide (NO) is an important signaling compound in prokaryotes and eukaryotes. In plants, NO regulates critical developmental transitions and stress responses. Here, we identify a mechanism for NO sensing that coordinates responses throughout development based on targeted degradation of plant-specific transcriptional regulators, the group VII ethylene response factors (ERFs). We show that the N-end rule pathway of targeted proteolysis targets these proteins for destruction in the presence of NO, and we establish them as critical regulators of diverse NO-regulated processes, including seed germination, stomatal closure, and hypocotyl elongation. Furthermore, we define the molecular mechanism for NO control of germination and crosstalk with abscisic acid (ABA) signaling through ERF-regulated expression of ABSCISIC ACID INSENSITIVE5 (ABI5). Our work demonstrates how NO sensing is integrated across multiple physiological processes by direct modulation of transcription factor stability and identifies group VII ERFs as central hubs for the perception of gaseous signals in plants.
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Affiliation(s)
- Daniel J Gibbs
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Nurulhikma Md Isa
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Mahsa Movahedi
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, UK
| | - Jorge Lozano-Juste
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - Guillermina M Mendiondo
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Sophie Berckhan
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Nora Marín-de la Rosa
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - Jorge Vicente Conde
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Cristina Sousa Correia
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Simon P Pearce
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - George W Bassel
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK
| | - Bulut Hamali
- Department of Biochemistry and Cell Biology, Max F. Perutz Laboratories, University of Vienna, Dr. Bohr Gasse 9, Vienna 1030, Austria
| | - Prabhavathi Talloji
- Department of Biochemistry and Cell Biology, Max F. Perutz Laboratories, University of Vienna, Dr. Bohr Gasse 9, Vienna 1030, Austria
| | - Daniel F A Tomé
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - Alberto Coego
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - Jim Beynon
- School of Life Sciences, University of Warwick, Coventry CV4 7AL, UK
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - Andreas Bachmair
- Department of Biochemistry and Cell Biology, Max F. Perutz Laboratories, University of Vienna, Dr. Bohr Gasse 9, Vienna 1030, Austria
| | - José León
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Ciudad Politécnica de la Innovación, 46022 Valencia, Spain
| | - Julie E Gray
- Department of Molecular Biology and Biotechnology, University of Sheffield, Sheffield S10 2TN, UK
| | - Frederica L Theodoulou
- Biological Chemistry and Crop Protection Department, Rothamsted Research, Harpenden AL5 2JQ, UK
| | - Michael J Holdsworth
- Division of Plant and Crop Sciences, School of Biosciences, University of Nottingham, Loughborough LE12 5RD, UK.
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Paque S, Mouille G, Grandont L, Alabadí D, Gaertner C, Goyallon A, Muller P, Primard-Brisset C, Sormani R, Blázquez MA, Perrot-Rechenmann C. AUXIN BINDING PROTEIN1 links cell wall remodeling, auxin signaling, and cell expansion in arabidopsis. Plant Cell 2014; 26:280-95. [PMID: 24424095 PMCID: PMC3963575 DOI: 10.1105/tpc.113.120048] [Citation(s) in RCA: 28] [Impact Index Per Article: 2.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
Cell expansion is an increase in cell size and thus plays an essential role in plant growth and development. Phytohormones and the primary plant cell wall play major roles in the complex process of cell expansion. In shoot tissues, cell expansion requires the auxin receptor AUXIN BINDING PROTEIN1 (ABP1), but the mechanism by which ABP1 affects expansion remains unknown. We analyzed the effect of functional inactivation of ABP1 on transcriptomic changes in dark-grown hypocotyls and investigated the consequences of gene expression on cell wall composition and cell expansion. Molecular and genetic evidence indicates that ABP1 affects the expression of a broad range of cell wall-related genes, especially cell wall remodeling genes, mainly via an SCF(TIR/AFB)-dependent pathway. ABP1 also functions in the modulation of hemicellulose xyloglucan structure. Furthermore, fucosidase-mediated defucosylation of xyloglucan, but not biosynthesis of nonfucosylated xyloglucan, rescued dark-grown hypocotyl lengthening of ABP1 knockdown seedlings. In muro remodeling of xyloglucan side chains via an ABP1-dependent pathway appears to be of critical importance for temporal and spatial control of cell expansion.
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Affiliation(s)
- Sébastien Paque
- Institut des Sciences du Végétal, UPR2355, CNRS, Saclay Plant Sciences, 91198 Gif sur Yvette Cedex, France
| | - Grégory Mouille
- Institut Jean-Pierre Bourgin, Saclay Plant Sciences, INRA Centre de Versailles-Grignon, 78026 Versailles Cedex, France
| | - Laurie Grandont
- Institut des Sciences du Végétal, UPR2355, CNRS, Saclay Plant Sciences, 91198 Gif sur Yvette Cedex, France
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Planta, Consejo Superior de Investigaciones Científicas, Universitat Politécnica de Valencia, 46022 Valencia, Spain
| | - Cyril Gaertner
- Institut Jean-Pierre Bourgin, Saclay Plant Sciences, INRA Centre de Versailles-Grignon, 78026 Versailles Cedex, France
| | - Arnaud Goyallon
- Institut Jean-Pierre Bourgin, Saclay Plant Sciences, INRA Centre de Versailles-Grignon, 78026 Versailles Cedex, France
| | - Philippe Muller
- Institut des Sciences du Végétal, UPR2355, CNRS, Saclay Plant Sciences, 91198 Gif sur Yvette Cedex, France
| | - Catherine Primard-Brisset
- Institut des Sciences du Végétal, UPR2355, CNRS, Saclay Plant Sciences, 91198 Gif sur Yvette Cedex, France
| | - Rodnay Sormani
- Institut Jean-Pierre Bourgin, Saclay Plant Sciences, INRA Centre de Versailles-Grignon, 78026 Versailles Cedex, France
| | - Miguel A. Blázquez
- Instituto de Biología Molecular y Celular de Planta, Consejo Superior de Investigaciones Científicas, Universitat Politécnica de Valencia, 46022 Valencia, Spain
| | - Catherine Perrot-Rechenmann
- Institut des Sciences du Végétal, UPR2355, CNRS, Saclay Plant Sciences, 91198 Gif sur Yvette Cedex, France
- Address correspondence to
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29
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Abbas M, Alabadí D, Blázquez MA. Differential growth at the apical hook: all roads lead to auxin. Front Plant Sci 2013; 4:441. [PMID: 24204373 PMCID: PMC3817370 DOI: 10.3389/fpls.2013.00441] [Citation(s) in RCA: 44] [Impact Index Per Article: 4.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2013] [Accepted: 10/15/2013] [Indexed: 05/18/2023]
Abstract
The apical hook is a developmentally regulated structure that appears in dicotyledonous seedlings when seeds germinate buried in the soil. It protects the shoot apical meristem and cotyledons from damage while the seedling is pushing upwards seeking for light, and it is formed by differential cell expansion between both sides of the upper part of the hypocotyl. Its apparent simplicity and the fact that it is dispensable when seedlings are grown in vitro have converted the apical hook in one of the favorite experimental models to study the regulation of differential growth. The involvement of hormones -especially auxin-in this process was manifested already in the early studies. Remarkably, a gradient of this hormone across the hook curvature is instrumental to complete its development, similar to what has been proposed for other processes involving the bending of an organ, such as tropic responses. In agreement with this, other hormones-mainly gibberellins and ethylene-and the light, regulate in a timely and interconnected manner the auxin gradient to promote hook development and its opening, respectively. Here, we review the latest findings obtained mainly with the apical hook of Arabidopsis thaliana, paying special attention to the molecular mechanisms for the cross-regulation between the different hormone signaling pathways that underlie this developmental process.
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Affiliation(s)
| | - David Alabadí
- *Correspondence: David Alabadí, Instituto de Biología Molecular y Celular de Plantas, Universitat Politècnica de València - Consejo Superior de Investigaciones Científicas, Edificio E8, Ingeniero Fausto Elio s/n, Valencia, 46022, Spain e-mail:
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30
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Abstract
Changes in gene expression are the main outcome of hormone signaling cascades that widely control plant physiology. In the case of the hormones gibberellins, the transcriptional control is exerted through the activity of the DELLA proteins, which act as negative regulators in the signaling pathway. This review focuses on recent transcriptomic approaches in the context of gibberellin signaling, which have provided useful information on new processes regulated by these hormones such as the regulation of photosynthesis and gravitropism. Moreover, the enrichment of specific cis-elements among DELLA primary targets has also helped extend the view that DELLA proteins regulate gene expression through the interaction with multiple transcription factors from different families.
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Affiliation(s)
- Antonella Locascio
- Instituto de Biología Molecular y Celular de Plantas-CSIC-U. Politécnica de Valencia, Valencia, Spain
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31
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Locascio A, Blázquez MA, Alabadí D. Dynamic regulation of cortical microtubule organization through prefoldin-DELLA interaction. Curr Biol 2013; 23:804-9. [PMID: 23583555 DOI: 10.1016/j.cub.2013.03.053] [Citation(s) in RCA: 101] [Impact Index Per Article: 9.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 12/17/2012] [Revised: 03/06/2013] [Accepted: 03/22/2013] [Indexed: 12/23/2022]
Abstract
Plant morphogenesis relies on specific patterns of cell division and expansion. It is well established that cortical microtubules influence the direction of cell expansion, but less is known about the molecular mechanisms that regulate microtubule arrangement. Here we show that the phytohormones gibberellins (GAs) regulate microtubule orientation through physical interaction between the nuclear-localized DELLA proteins and the prefoldin complex, a cochaperone required for tubulin folding. In the presence of GA, DELLA proteins are degraded, and the prefoldin complex stays in the cytoplasm and is functional. In the absence of GA, the prefoldin complex is localized to the nucleus, which severely compromises α/β-tubulin heterodimer availability, affecting microtubule organization. The physiological relevance of this molecular mechanism was confirmed by the observation that the daily rhythm of plant growth was accompanied by coordinated oscillation of DELLA accumulation, prefoldin subcellular localization, and cortical microtubule reorientation.
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Affiliation(s)
- Antonella Locascio
- Instituto de Biología Molecular y Celular de Plantas, Consejo Superior de Investigaciones Científicas-Universidad Politécnica de Valencia, Ingeniero Fausto Elio s/n, 46022 Valencia, Spain
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Rakusová H, Gallego-Bartolomé J, Vanstraelen M, Robert HS, Alabadí D, Blázquez MA, Benková E, Friml J. Polarization of PIN3-dependent auxin transport for hypocotyl gravitropic response in Arabidopsis thaliana. Plant J 2011; 67:817-26. [PMID: 21569134 DOI: 10.1111/j.1365-313x.2011.04636.x] [Citation(s) in RCA: 51] [Impact Index Per Article: 3.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/08/2023]
Abstract
Gravitropism aligns plant growth with gravity. It involves gravity perception and the asymmetric distribution of the phytohormone auxin. Here we provide insights into the mechanism for hypocotyl gravitropic growth. We show that the Arabidopsis thaliana PIN3 auxin transporter is required for the asymmetric auxin distribution for the gravitropic response. Gravistimulation polarizes PIN3 to the bottom side of hypocotyl endodermal cells, which correlates with an increased auxin response at the lower hypocotyl side. Both PIN3 polarization and hypocotyl bending require the activity of the trafficking regulator GNOM and the protein kinase PINOID. Our data suggest that gravity-induced PIN3 polarization diverts the auxin flow to mediate the asymmetric distribution of auxin for gravitropic shoot bending.
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Affiliation(s)
- Hana Rakusová
- Department of Plant Systems Biology, VIB, 9052 Gent, Belgium
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Marín-de la Rosa N, Alabadí D, Blázquez MÁ, Arana MV. Integrating circadian and gibberellin signaling in Arabidopsis: possible links between the circadian clock and the AtGID1 transcription. Plant Signal Behav 2011; 6:1411-3. [PMID: 21852756 PMCID: PMC3258079 DOI: 10.4161/psb.6.9.17209] [Citation(s) in RCA: 2] [Impact Index Per Article: 0.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/17/2023]
Abstract
The circadian clock acts as central coordinator of plant activity, and it regulates key traits for plant fitness such as flowering time, gas exchange, growth, and stress responses. In the May issue of the Proceedings of the National Academy of Science we describe the circadian regulation of gibberellin (GA) signaling, through transcriptional control of GA receptor genes (GID1a and GID1b). We show that, in short day photocycles, the expression of GA receptors oscillates in seedlings, yielding a window of strong GA activity at the end of the night that overlaps with the period of maximum growth. This clock-mediated control of GA signaling is not only crucial for the establishment of rhythmic patterns of growth but also affects the expression of many circadian-controlled genes that participate in a wide range of biological processes. Here we propose a possible mechanism that might operate for the transcriptional control of GID1 expression by the circadian clock.
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Affiliation(s)
| | - David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC); Valencia, Spain
| | | | - María Verónica Arana
- Instituto Nacional de Tecnología Agropecuaria; EEA Bariloche and CONICET; Rio Negro, Argentina
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Gallego-Bartolomé J, Alabadí D, Blázquez MA. DELLA-induced early transcriptional changes during etiolated development in Arabidopsis thaliana. PLoS One 2011; 6:e23918. [PMID: 21904598 PMCID: PMC3164146 DOI: 10.1371/journal.pone.0023918] [Citation(s) in RCA: 46] [Impact Index Per Article: 3.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 06/16/2011] [Accepted: 08/01/2011] [Indexed: 11/24/2022] Open
Abstract
The hormones gibberellins (GAs) control a wide variety of processes in plants, including stress and developmental responses. This task largely relies on the activity of the DELLA proteins, nuclear-localized transcriptional regulators that do not seem to have DNA binding capacity. The identification of early target genes of DELLA action is key not only to understand how GAs regulate physiological responses, but also to get clues about the molecular mechanisms by which DELLAs regulate gene expression. Here, we have investigated the global, early transcriptional response triggered by the Arabidopsis DELLA protein GAI during skotomorphogenesis, a developmental program tightly regulated by GAs. Our results show that the induction of GAI activity has an almost immediate effect on gene expression. Although this transcriptional regulation is largely mediated by the PIFs and HY5 transcription factors based on target meta-analysis, additional evidence points to other transcription factors that would be directly involved in DELLA regulation of gene expression. First, we have identified cis elements recognized by Dofs and type-B ARRs among the sequences enriched in the promoters of GAI targets; and second, an enrichment in additional cis elements appeared when this analysis was extended to a dataset of early targets of the DELLA protein RGA: CArG boxes, bound by MADS-box proteins, and the E-box CACATG that links the activity of DELLAs to circadian transcriptional regulation. Finally, Gene Ontology analysis highlights the impact of DELLA regulation upon the homeostasis of the GA, auxin, and ethylene pathways, as well as upon pre-existing transcriptional networks.
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Affiliation(s)
- Javier Gallego-Bartolomé
- Instituto de Biología Molecular y Celular de Plantas (CSIC-Universidad Politécnica de Valencia), Valencia, Spain
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35
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Gallego-Bartolomé J, Arana MV, Vandenbussche F, Zádníková P, Minguet EG, Guardiola V, Van Der Straeten D, Benkova E, Alabadí D, Blázquez MA. Hierarchy of hormone action controlling apical hook development in Arabidopsis. Plant J 2011; 67:622-34. [PMID: 21535259 DOI: 10.1111/j.1365-313x.2011.04621.x] [Citation(s) in RCA: 62] [Impact Index Per Article: 4.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/04/2023]
Abstract
The apical hook develops in the upper part of the hypocotyl when seeds buried in the soil germinate, and serves to protect cotyledons and the shoot apical meristem from possible damage caused by pushing through the soil. The curvature is formed through differential cell growth that occurs at the two opposite sides of the hypocotyl, and it is established by a gradient of auxin activity and refined by the coordinated action of auxin and ethylene. Here we show that gibberellins (GAs) promote hook development through the transcriptional regulation of several genes of the ethylene and auxin pathways in Arabidopsis. The level of GA activity determines the speed of hook formation and the extent of the curvature during the formation phase independently of ethylene, probably by modulating auxin transport and response through HLS1, PIN3, and PIN7. Moreover, GAs cooperate with ethylene in preventing hook opening, in part through the induction of ethylene production mediated by ACS5/ETO2 and ACS8.
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Affiliation(s)
- Javier Gallego-Bartolomé
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), Ingeniero Fausto Elio s/n, 46022 Valencia, Spain
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Gallego-Bartolomé J, Kami C, Fankhauser C, Alabadí D, Blázquez MA. A hormonal regulatory module that provides flexibility to tropic responses. Plant Physiol 2011; 156:1819-25. [PMID: 21543725 PMCID: PMC3149964 DOI: 10.1104/pp.111.173971] [Citation(s) in RCA: 12] [Impact Index Per Article: 0.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/05/2023]
Abstract
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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Alabadí D, Blázquez MA, Carbonell J, Ferrándiz C, Pérez-Amador MA. Instructive roles for hormones in plant development. Int J Dev Biol 2010; 53:1597-608. [PMID: 19247940 DOI: 10.1387/ijdb.072423da] [Citation(s) in RCA: 53] [Impact Index Per Article: 3.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 10/21/2022]
Abstract
Plants, like animals, construct their body following modular sets of instructions that determine cell fate, morphogenesis and patterning, among other building requirements. Hormones regulate plant growth in different ways, and there is increasing evidence for a decisive function of certain hormones in the establishment of developmental programs, equivalent to the role of peptidic molecules and signals of another nature in animal embryo development. Here, we review this role of hormones as instructive agents, and illustrate it with examples such as the generation of morphogenetic gradients by auxin (which determine organ patterning and phyllotaxis), the specification of cell fate at the shoot meristem by gibberellins and cytokinins, the switch between alternative developmental programs (photo- and skotomorphogenesis) by gibberellins and brassinosteroids, and the decision between pistil senescence or fruit growth after anthesis.
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Affiliation(s)
- David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), Universidad Politécnica de Valencia, Valencia, Spain
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Stavang JA, Gallego-Bartolomé J, Gómez MD, Yoshida S, Asami T, Olsen JE, García-Martínez JL, Alabadí D, Blázquez MA. Hormonal regulation of temperature-induced growth in Arabidopsis. Plant J 2009; 60:589-601. [PMID: 19686536 DOI: 10.1111/j.1365-313x.2009.03983.x] [Citation(s) in RCA: 189] [Impact Index Per Article: 12.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/03/2023]
Abstract
Successful plant survival depends upon the proper integration of information from the environment with endogenous cues to regulate growth and development. We have investigated the interplay between ambient temperature and hormone action during the regulation of hypocotyl elongation, and we have found that gibberellins (GAs) and auxin are quickly and independently recruited by temperature to modulate growth rate, whereas activity of brassinosteroids (BRs) seems to be required later on. Impairment of GA biosynthesis blocked the increased elongation caused at higher temperatures, but hypocotyls of pentuple DELLA knockout mutants still reduced their response to higher temperatures when BR synthesis or auxin polar transport were blocked. The expression of several key genes involved in the biosynthesis of GAs and auxin was regulated by temperature, which indirectly resulted in coherent variations in the levels of accumulation of nuclear GFP-RGA (repressor of GA1) and in the activity of the DR5 reporter. DNA microarray and genetic analyses allowed the identification of the transcription factor PIF4 (phytochrome-interacting factor 4) as a major target in the promotion of growth at higher temperature. These results suggest that temperature regulates hypocotyl growth by individually impinging on several elements of a pre-existing network of signaling pathways involving auxin, BRs, GAs, and PIF4.
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Affiliation(s)
- Jon A Stavang
- Department of Plant and Environmental Sciences, Norwegian University of Life Sciences, N1432 As, Norway
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Alabadí D, Blázquez MA. Molecular interactions between light and hormone signaling to control plant growth. Plant Mol Biol 2009; 69:409-17. [PMID: 18797998 DOI: 10.1007/s11103-008-9400-y] [Citation(s) in RCA: 73] [Impact Index Per Article: 4.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/24/2008] [Accepted: 09/04/2008] [Indexed: 05/22/2023]
Abstract
As sessile organisms, plants modulate their growth rate and development according to the continuous variation in the conditions of their surrounding environment, an ability referred to as plasticity. This ability relies on a web of interactions between signaling pathways triggered by endogenous and environmental cues. How changes in environmental factors are interpreted by the plant in terms of developmental or growth cues or, in other words, how they contribute to plant plasticity is a current, major question in plant biology. Light stands out among the environmental factors that shape plant development. Plants have evolved systems that allow them to monitor both quantitative and qualitative differences in the light that they perceive, that render important changes in their growth habit. In this review we focus on recent findings about how information from this environmental cue is integrated during de-etiolation and in the shade-avoidance syndrome, and modulated by several hormone pathways-the endogenous cues. In some cases the interaction between a hormone and the light signaling pathways is reciprocal, as is the case of the gibberellin pathway, whereas in other cases hormone pathways act downstream of the environmental cue to regulate growth. Moreover, the circadian clock adds an additional layer of regulation, which has been proposed to integrate the information provided by light with that provided by hormone pathways, to regulate daily growth.
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Affiliation(s)
- David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (UPV-CSIC), Universidad Politécnica de Valencia, Avda de los Naranjos s/n, 46022 Valencia, Spain
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Abstract
After germination, seedlings follow one of two developmental programs, photo- and skotomorphogenesis, and the choice is determined by the interplay between environmental signals (light) and endogenous cues (the plant hormones gibberellins among others). In the December issue of Plant Journal we describe a molecular mechanism that allows the integration of light and gibberellin signaling to tightly control the switch between skoto- and photomorphogenesis. On one hand, the stability of HY5, a transcription factor required by light to promote photomorphogenesis, is enhanced in the light and in situations with compromised GA biosynthesis. And, on the other hand, the promotion of growth during etiolation is exerted by the PIF family of transcription factors, whose abundance is enhanced by the absence of light, and whose activity is regulated by functional interaction with gibberellin signaling. In this addendum we propose that the control of the activity of light-dependent transcription factors by gibberellins is a common theme in other developmental processes, such as shade avoidance and photoperiodic regulation of cell expansion.
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Affiliation(s)
- David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (U. Politécnica de Valencia-CSIC); Valencia, Spain
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Barrero JM, Rodríguez PL, Quesada V, Alabadí D, Blázquez MA, Boutin JP, Marion-Poll A, Ponce MR, Micol JL. The ABA1 gene and carotenoid biosynthesis are required for late skotomorphogenic growth in Arabidopsis thaliana. Plant Cell Environ 2008; 31:227-234. [PMID: 17996011 DOI: 10.1111/j.1365-3040.2007.01759.x] [Citation(s) in RCA: 26] [Impact Index Per Article: 1.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/25/2023]
Abstract
Several plant hormones, including auxin, brassinosteroids and gibberellins, are required for skotomorphogenesis, which is the etiolated growth that seedlings undergo in the absence of light. To examine the growth of abscisic acid (ABA)-deficient mutants in the dark, we analysed several aba1 loss-of-function alleles, which are deficient in zeaxanthin epoxidase. The aba1 mutants displayed a partially de-etiolated phenotype, including reduced hypocotyl growth, cotyledon expansion and the development of true leaves, during late skotomorphogenic growth. In contrast, only small differences in hypocotyl growth were found between wild-type seedlings and ABA-deficient mutants impaired in subsequent steps of the pathway, namely nced3, aba2, aba3 and aao3. Interestingly, phenocopies of the partially de-etiolated phenotype of the aba1 mutants were obtained when wild-type seedlings were dark-grown on medium supplemented with fluridone, an inhibitor of phytoene desaturase, and hence, of carotenoid biosynthesis. ABA supplementation did not restore the normal skotomorphogenic growth of aba1 mutants or fluridone-treated wild-type plants, suggesting a direct inhibitory effect of fluridone on carotenoid biosynthesis. In addition, aba1 mutants showed impaired production of the beta-carotene-derived xanthophylls, neoxanthin, violaxanthin and antheraxanthin. Because fluridone treatment of wild-type plants phenocopied the phenotype of dark-grown aba1 mutants, impaired carotenoid biosynthesis in aba1 mutants is probably responsible for the observed skotomorphogenic phenotype. Thus, ABA1 is required for skotomorphogenic growth, and beta-carotene-derived xanthophylls are putative regulators of skotomorphogenesis.
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Affiliation(s)
- José María Barrero
- División de Genética and Instituto de Bioingeniería, Universidad Miguel Hernández, Campus de Elche, 03202 Elche, Alicante, Spain
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Alabadí D, Gallego-Bartolomé J, Orlando L, García-Cárcel L, Rubio V, Martínez C, Frigerio M, Iglesias-Pedraz JM, Espinosa A, Deng XW, Blázquez MA. Gibberellins modulate light signaling pathways to prevent Arabidopsis seedling de-etiolation in darkness. Plant J 2008; 53:324-35. [PMID: 18053005 DOI: 10.1111/j.1365-313x.2007.03346.x] [Citation(s) in RCA: 91] [Impact Index Per Article: 5.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/21/2023]
Abstract
In many plants, photomorphogenesis is the default developmental program after seed germination, and provides the key features that allow adaptation to light. This program is actively repressed if germination occurs in the absence of light, through a mechanism dependent on the E3 ubiquitin ligase activity that is encoded in Arabidopsis by COP1 (CONSTITUTIVE PHOTOMORPHOGENIC 1), which induces proteolytic degradation of transcription factors necessary for light-regulated development, such as HY5 (LONG HYPOCOTYL 5) and HYH (LONG HYPOCOTYL 5 HOMOLOG), and stabilization of transcription factors that promote skotomorphogenesis, such as PIF3 (PHYTOCHROME INTERACTING FACTOR 3). Seedlings deficient in gibberellin (GA) synthesis or signaling display a de-etiolated phenotype when grown in darkness, equivalent to the phenotype of cop1 mutants, which indicates that the switch between photo- and skotomorphogenesis is also under hormonal control. Here we provide evidence for the existence of crosstalk between GA and the COP1-mediated pathway, and identify HY5 and the PIF family as nodes of a regulatory network. This interaction occurs through distinct molecular mechanisms, based on the observation that GA signaling regulates protein stability of HY5, and the activity of PIF3.
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Affiliation(s)
- David Alabadí
- Instituto de Biología Molecular y Celular de Plantas (CSIC-UPV), Av de los Naranjos s/n, 46022-Valencia, Spain
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Frigerio M, Alabadí D, Pérez-Gómez J, García-Cárcel L, Phillips AL, Hedden P, Blázquez MA. Transcriptional regulation of gibberellin metabolism genes by auxin signaling in Arabidopsis. Plant Physiol 2006; 142:553-63. [PMID: 16905669 PMCID: PMC1586059 DOI: 10.1104/pp.106.084871] [Citation(s) in RCA: 177] [Impact Index Per Article: 9.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 06/08/2006] [Accepted: 08/03/2006] [Indexed: 05/11/2023]
Abstract
Auxin and gibberellins (GAs) overlap in the regulation of multiple aspects of plant development, such as root growth and organ expansion. This coincidence raises questions about whether these two hormones interact to regulate common targets and what type of interaction occurs in each case. Auxins induce GA biosynthesis in a range of plant species. We have undertaken a detailed analysis of the auxin regulation of expression of Arabidopsis (Arabidopsis thaliana) genes encoding GA 20-oxidases and GA 3-oxidases involved in GA biosynthesis, and GA 2-oxidases involved in GA inactivation. Our results show that auxin differentially up-regulates the expression of various genes involved in GA metabolism, in particular several AtGA20ox and AtGA2ox genes. Up-regulation occurred very quickly after auxin application; the response was mimicked by incubations with the protein synthesis inhibitor cycloheximide and was blocked by treatments with the proteasome inhibitor MG132. The effects of auxin treatment reflect endogenous regulation because equivalent changes in gene expression were observed in the auxin overproducer mutant yucca. The results suggest direct regulation of the expression of GA metabolism genes by Aux/IAA and ARF proteins. The physiological relevance of this regulation is supported by the observation that the phenotype of certain gain-of-function Aux/IAA alleles could be alleviated by GA application, which suggests that changes in GA metabolism mediate part of auxin action during development.
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Affiliation(s)
- Martín Frigerio
- Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia, Consejo Superior de Investigaciones Científicas, 46022 Valencia, Spain
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Alabadí D, Gil J, Blázquez MA, García-Martínez JL. Gibberellins repress photomorphogenesis in darkness. Plant Physiol 2004; 134:1050-7. [PMID: 14963246 PMCID: PMC389929 DOI: 10.1104/pp.103.035451] [Citation(s) in RCA: 158] [Impact Index Per Article: 7.9] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 10/30/2003] [Revised: 11/28/2003] [Accepted: 12/09/2003] [Indexed: 05/18/2023]
Abstract
Plants undergo two different developmental programs depending on whether they are growing in darkness (skotomorphogenesis) or in the presence of light (photomorphogenesis). It has been proposed that the latter is the default pathway followed by many plants after germination and before the seedling emerges from soil. The transition between the two pathways is tightly regulated. The conserved COP1-based complex is central in the light-dependent repression of photomorphogenesis in darkness. Besides this control, hormones such as brassinosteroids (BRs), cytokinins, auxins, or ethylene also have been shown to regulate, to different extents, this developmental switch. In the present work, we show that the hormone gibberellin (GA) widely participates in this regulation. Studies from Arabidopsis show that both chemical and genetic reductions of endogenous GA levels partially derepress photomorphogenesis in darkness. This is based both on morphological phenotypes, such as hypocotyl elongation and hook and cotyledon opening, and on molecular phenotypes, such as misregulation of the light-controlled genes CAB2 and RbcS. Genetic studies indicate that the GA signaling elements GAI and RGA participate in these responses. Our results also suggest that GA regulation of this response partially depends on BRs. This regulation seems to be conserved across species because lowering endogenous GA levels in pea (Pisum sativum) induces full de-etiolation in darkness, which is not reverted by BR application. Our results, therefore, attribute an important role for GAs in the establishment of etiolated growth and in repression of photomorphogenesis.
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Affiliation(s)
- David Alabadí
- Instituto de Biología Molecular y Celular de Plantas, Valencia-46022, Spain
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Más P, Alabadí D, Yanovsky MJ, Oyama T, Kay SA. Dual role of TOC1 in the control of circadian and photomorphogenic responses in Arabidopsis. Plant Cell 2003; 15:223-36. [PMID: 12509533 PMCID: PMC143493 DOI: 10.1105/tpc.006734] [Citation(s) in RCA: 162] [Impact Index Per Article: 7.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/26/2002] [Accepted: 10/02/2002] [Indexed: 05/18/2023]
Abstract
To examine the role of the TOC1 (TIMING OF CAB EXPRESSION1) gene in the Arabidopsis circadian system, we generated a series of transgenic plants expressing a gradation in TOC1 levels. Silencing of the TOC1 gene causes arrhythmia in constant darkness and in various intensities of red light, whereas in blue light, the clock runs faster in silenced plants than in wild-type plants. Increments in TOC1 gene dosage delayed the pace of the clock, whereas TOC1 overexpression abolished rhythmicity in all light conditions tested. Our results show that TOC1 RNA interference and toc1-2 mutant plants displayed an important reduction in sensitivity to red and far-red light in the control of hypocotyl elongation, whereas increments in TOC1 gene dosage clearly enhanced light sensitivity. Furthermore, the red light-mediated induction of CCA1/LHY expression was decreased in TOC1 RNA interference and toc1-2 mutant plants, indicating a role for TOC1 in the phytochrome regulation of circadian gene expression. We conclude that TOC1 is an important component of the circadian clock in Arabidopsis with a crucial function in the integration of light signals to control circadian and morphogenic responses.
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Affiliation(s)
- Paloma Más
- Department of Cell Biology, Scripps Research Institute, La Jolla, California 92037, USA
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Fos M, Proaño K, Alabadí D, Nuez F, Carbonell J, García-Martínez JL. Polyamine metabolism is altered in unpollinated parthenocarpic pat-2 tomato ovaries. Plant Physiol 2003; 131:359-66. [PMID: 12529543 PMCID: PMC166815 DOI: 10.1104/pp.013037] [Citation(s) in RCA: 10] [Impact Index Per Article: 0.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/14/2002] [Revised: 09/13/2002] [Accepted: 10/07/2002] [Indexed: 05/19/2023]
Abstract
Facultative parthenocarpy induced by the recessive mutation pat-2 in tomato (Lycopersicon esculentum Mill.) depends on gibberellins (GAs) and is associated with changes in GA content in unpollinated ovaries. Polyamines (PAs) have also been proposed to play a role in early tomato fruit development. We therefore investigated whether PAs are able to induce parthenocarpy and whether the pat-2 mutation alters the content and metabolism of PAs in unpollinated ovaries. Application of putrescine, spermidine, and spermine to wild-type unpollinated tomato ovaries (cv Madrigal [MA/wt]) induced partial parthenocarpy. Parthenocarpic growth of MA/pat-2 (a parthenocarpic near-isogenic line to MA/wt) ovaries was negated by paclobutrazol (GA biosynthesis inhibitor), and this inhibition was counteracted by spermidine. Application of alpha-difluoromethyl-ornithine (-Orn) and/or alpha-difluoromethyl-arginine (-Arg), irreversible inhibitors of the putrescine biosynthesis enzymes Orn decarboxylase (ODC) and Arg decarboxylase, respectively, prevented growth of unpollinated MA/pat-2 ovaries. Alpha-difluoromethyl-Arg inhibition was counteracted by putrescine and GA(3), whereas that of alpha-difluoromethyl-Orn was counteracted by GA(3) but not by putrescine or spermidine. In unpollinated MA/pat-2 ovaries, the content of free spermine was significantly higher than in MA/wt ovaries. ODC activity was higher in pat-2 ovaries than in MA/wt. Transcript levels of genes encoding ODC and spermidine synthase were also higher in MA/pat-2. All together, these results strongly suggest that the parthenocarpic ability of pat-2 mutants depends on elevated PAs levels in unpollinated mutant ovaries, which correlate with an activation of the ODC pathway, probably as a consequence of elevated GA content in unpollinated pat-2 tomato ovaries.
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Affiliation(s)
- Mariano Fos
- Departmento de Biología Vegetal, Universidad Politécnica de Valencia, 46022-Valencia, Spain.
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Abstract
Circadian clocks are autoregulatory, endogenous mechanisms that allow organisms, from bacteria to humans, to advantageously time a wide range of activities within 24-hr environmental cycles. CIRCADIAN CLOCK ASSOCIATED 1 (CCA1) and LATE ELONGATED HYPOCOTYL (LHY) are thought to be important components of the circadian clock in the model plant Arabidopsis. The similar circadian phenotypes of lines overexpressing either CCA1 or LHY have suggested that the functions of these two transcription factors are largely overlapping. cca1-1 plants, which lack CCA1 protein, show a short-period phenotype for the expression of several genes when assayed under constant light conditions. This suggests that LHY function is able to only partially compensate for the lack of CCA1 protein, resulting in a clock with a faster pace in cca1-1 plants. We have obtained plants lacking CCA1 and with LHY function strongly reduced, cca1-1 lhy-R, and show that these plants are unable to maintain sustained oscillations in both constant light and constant darkness. However, these plants exhibit some circadian function in light/dark cycles, showing that the Arabidopsis circadian clock is not entirely dependent on CCA1 and LHY activities.
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Affiliation(s)
- David Alabadí
- Department of Cell Biology, Institute for Childhood and Neglected Diseases, The Scripps Research Institute, 10550 North Torrey Pines Road, La Jolla, CA 92037, USA
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Abstract
The interactive regulation between clock genes is central for oscillator function. Here, we show interactions between the Arabidopsis clock genes LATE ELONGATED HYPOCOTYL (LHY), CIRCADIAN CLOCK ASSOCIATED 1 (CCA1), and TIMING OF CAB EXPRESSION 1 (TOC1). The MYB transcription factors LHY and CCA1 negatively regulate TOC1 expression. We show that both proteins bind to a region in the TOC1 promoter that is critical for its clock regulation. Conversely, TOC1 appears to participate in the positive regulation of LHY and CCA1 expression. Our results indicate that these interactions form a loop critical for clock function in Arabidopsis.
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Affiliation(s)
- D Alabadí
- Department of Cell Biology and Institute for Childhood and Neglected Diseases, The Scripps Research Institute, La Jolla, CA 92037, USA
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Alabadí D, Carbonell J. Differential expression of two spermidine synthase genes during early fruit development and in vegetative tissues of pea. Plant Mol Biol 1999; 39:933-43. [PMID: 10344199 DOI: 10.1023/a:1006158819849] [Citation(s) in RCA: 16] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
Two cDNAs from young pea fruits coding for functional spermidine synthases (EC 2.5.1.16) were isolated. The corresponding genes were named psSPDSYN1 and psSPDSYN2. Both cDNAs complemented spe3delta gene when introduced into the Y480 strain of Saccharomyces cerevisiae, which is a null mutant for the spermidine synthase gene. psSPDSYN1 and psSPDSYN2 are regulated differentially. psSPDSYN1 is up-regulated early after fruit set whereas psSPDSYN2 is expressed later. Spermidine synthase activity was detected in pea ovaries, and correlates with the pattern of expression of psSPDSYN1. In the pea plant, psSPDSYN1 is highly expressed in actively growing tissues, whereas the highest level of psSPDSYN2 mRNA was detected in fully elongated stem.
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MESH Headings
- Amino Acid Sequence
- Blotting, Northern
- DNA, Complementary/chemistry
- DNA, Complementary/isolation & purification
- DNA, Plant/analysis
- Enzyme Induction/drug effects
- Fruit/enzymology
- Fruit/genetics
- Fruit/growth & development
- Gene Expression Regulation, Developmental
- Gene Expression Regulation, Enzymologic
- Gene Expression Regulation, Plant
- Genes, Plant/genetics
- Gibberellins/pharmacology
- Molecular Sequence Data
- Pisum sativum/enzymology
- Pisum sativum/genetics
- Pisum sativum/growth & development
- RNA, Messenger/genetics
- RNA, Messenger/metabolism
- Sequence Analysis, DNA
- Sequence Homology, Amino Acid
- Spermidine Synthase/genetics
- Tissue Distribution
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Affiliation(s)
- D Alabadí
- Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia-CSIC, Spain
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Alabadí D, Carbonell J. Expression of ornithine decarboxylase is transiently increased by pollination, 2,4-dichlorophenoxyacetic acid, and gibberellic acid in tomato ovaries. Plant Physiol 1998; 118:323-8. [PMID: 9733552 PMCID: PMC34871 DOI: 10.1104/pp.118.1.323] [Citation(s) in RCA: 30] [Impact Index Per Article: 1.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/09/1998] [Accepted: 05/28/1998] [Indexed: 05/20/2023]
Abstract
A cDNA encoding for a functional ornithine decarboxylase has been isolated from a cDNA library of carpels of tomato (Lycopersicon esculentum Mill.). Ornithine decarboxylase in tomato is represented by a single-copy gene that we show to be up-regulated during early fruit growth induced by 2,4-dichlorophenoxyacetic acid and gibberellic acid.
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Affiliation(s)
- D Alabadí
- Departamento de Biología del Desarrollo, Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia-Consejo Superior de Investigaciones Científicas, Camino de Vera 14, 46022-Valencia, Spain
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