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Takawira LT, Hadj Bachir I, Ployet R, Tulloch J, San Clemente H, Christie N, Ladouce N, Dupas A, Rai A, Grima-Pettenati J, Myburg AA, Mizrachi E, Mounet F, Hussey SG. Functional investigation of five R2R3-MYB transcription factors associated with wood development in Eucalyptus using DAP-seq-ML. Plant Mol Biol 2023; 113:33-57. [PMID: 37661236 DOI: 10.1007/s11103-023-01376-y] [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] [Grants] [Track Full Text] [Subscribe] [Scholar Register] [Received: 11/15/2022] [Accepted: 07/31/2023] [Indexed: 09/05/2023]
Abstract
A multi-tiered transcriptional network regulates xylem differentiation and secondary cell wall (SCW) formation in plants, with evidence of both conserved and lineage-specific SCW network architecture. We aimed to elucidate the roles of selected R2R3-MYB transcription factors (TFs) linked to Eucalyptus wood formation by identifying genome-wide TF binding sites and direct target genes through an improved DAP-seq protocol combined with machine learning for target gene assignment (DAP-seq-ML). We applied this to five TFs including a well-studied SCW master regulator (EgrMYB2; homolog of AtMYB83), a repressor of lignification (EgrMYB1; homolog of AtMYB4), a TF affecting SCW thickness and vessel density (EgrMYB137; homolog of PtrMYB074) and two TFs with unclear roles in SCW regulation (EgrMYB135 and EgrMYB122). Each DAP-seq TF peak set (average 12,613 peaks) was enriched for canonical R2R3-MYB binding motifs. To improve the reliability of target gene assignment to peaks, a random forest classifier was developed from Arabidopsis DAP-seq, RNA-seq, chromatin, and conserved noncoding sequence data which demonstrated significantly higher precision and recall to the baseline method of assigning genes to proximal peaks. EgrMYB1, EgrMYB2 and EgrMYB137 predicted targets showed clear enrichment for SCW-related biological processes. As validation, EgrMYB137 overexpression in transgenic Eucalyptus hairy roots increased xylem lignification, while its dominant repression in transgenic Arabidopsis and Populus reduced xylem lignification, stunted growth, and caused downregulation of SCW genes. EgrMYB137 targets overlapped significantly with those of EgrMYB2, suggesting partial functional redundancy. Our results show that DAP-seq-ML identified biologically relevant R2R3-MYB targets supported by the finding that EgrMYB137 promotes SCW lignification in planta.
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Affiliation(s)
- Lazarus T Takawira
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
| | - Ines Hadj Bachir
- Laboratoire de Recherche en Sciences Végétales, Université Toulouse, CNRS, INP, Castanet-Tolosan, France
| | - Raphael Ployet
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
| | - Jade Tulloch
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
| | - Helene San Clemente
- Laboratoire de Recherche en Sciences Végétales, Université Toulouse, CNRS, INP, Castanet-Tolosan, France
| | - Nanette Christie
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
| | - Nathalie Ladouce
- Laboratoire de Recherche en Sciences Végétales, Université Toulouse, CNRS, INP, Castanet-Tolosan, France
| | - Annabelle Dupas
- Laboratoire de Recherche en Sciences Végétales, Université Toulouse, CNRS, INP, Castanet-Tolosan, France
| | - Avanish Rai
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
| | - Jacqueline Grima-Pettenati
- Laboratoire de Recherche en Sciences Végétales, Université Toulouse, CNRS, INP, Castanet-Tolosan, France
| | - Alexander A Myburg
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
| | - Eshchar Mizrachi
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa
| | - Fabien Mounet
- Laboratoire de Recherche en Sciences Végétales, Université Toulouse, CNRS, INP, Castanet-Tolosan, France.
| | - Steven G Hussey
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria, 0002, South Africa.
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Kairouani A, Pontier D, Picart C, Mounet F, Martinez Y, Le-Bot L, Fanuel M, Hammann P, Belmudes L, Merret R, Azevedo J, Carpentier MC, Gagliardi D, Couté Y, Sibout R, Bies-Etheve N, Lagrange T. Cell-type-specific control of secondary cell wall formation by Musashi-type translational regulators in Arabidopsis. eLife 2023; 12:RP88207. [PMID: 37773033 PMCID: PMC10541177 DOI: 10.7554/elife.88207] [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] [Indexed: 09/30/2023] Open
Abstract
Deciphering the mechanism of secondary cell wall/SCW formation in plants is key to understanding their development and the molecular basis of biomass recalcitrance. Although transcriptional regulation is essential for SCW formation, little is known about the implication of post-transcriptional mechanisms in this process. Here we report that two bonafide RNA-binding proteins homologous to the animal translational regulator Musashi, MSIL2 and MSIL4, function redundantly to control SCW formation in Arabidopsis. MSIL2/4 interactomes are similar and enriched in proteins involved in mRNA binding and translational regulation. MSIL2/4 mutations alter SCW formation in the fibers, leading to a reduction in lignin deposition, and an increase of 4-O-glucuronoxylan methylation. In accordance, quantitative proteomics of stems reveal an overaccumulation of glucuronoxylan biosynthetic machinery, including GXM3, in the msil2/4 mutant stem. We showed that MSIL4 immunoprecipitates GXM mRNAs, suggesting a novel aspect of SCW regulation, linking post-transcriptional control to the regulation of SCW biosynthesis genes.
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Affiliation(s)
- Alicia Kairouani
- Laboratoire Génome et Développement des Plantes, Université de Perpignan via Domitia, CNRS, UMR5096PerpignanFrance
| | - Dominique Pontier
- Laboratoire Génome et Développement des Plantes, Université de Perpignan via Domitia, CNRS, UMR5096PerpignanFrance
| | - Claire Picart
- Laboratoire Génome et Développement des Plantes, Université de Perpignan via Domitia, CNRS, UMR5096PerpignanFrance
| | - Fabien Mounet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, INP, UMR5546Castanet-TolosanFrance
| | - Yves Martinez
- FRAIB-CNRS Plateforme ImagerieCastanet-TolosanFrance
| | - Lucie Le-Bot
- Biopolymères Interactions Assemblages, UR1268 BIA, INRAENantesFrance
| | - Mathieu Fanuel
- Biopolymères Interactions Assemblages, UR1268 BIA, INRAENantesFrance
- PROBE research infrastructure, BIBS Facility, INRAENantesFrance
| | - Philippe Hammann
- Plateforme Protéomique Strasbourg Esplanade de CNRS, Université de StrasbourgStrasbourgFrance
| | - Lucid Belmudes
- Université Grenoble Alpes, INSERM, UA13 BGE, CNRS, CEA, FR2048GrenobleFrance
| | - Remy Merret
- Laboratoire Génome et Développement des Plantes, Université de Perpignan via Domitia, CNRS, UMR5096PerpignanFrance
| | - Jacinthe Azevedo
- Laboratoire Génome et Développement des Plantes, Université de Perpignan via Domitia, CNRS, UMR5096PerpignanFrance
| | - Marie-Christine Carpentier
- Laboratoire Génome et Développement des Plantes, Université de Perpignan via Domitia, CNRS, UMR5096PerpignanFrance
| | - Dominique Gagliardi
- Institut de Biologie Moléculaire des Plantes, IBMP, CNRS, Université de StrasbourgStrasbourgFrance
| | - Yohann Couté
- Université Grenoble Alpes, INSERM, UA13 BGE, CNRS, CEA, FR2048GrenobleFrance
| | - Richard Sibout
- Biopolymères Interactions Assemblages, UR1268 BIA, INRAENantesFrance
| | - Natacha Bies-Etheve
- Laboratoire Génome et Développement des Plantes, Université de Perpignan via Domitia, CNRS, UMR5096PerpignanFrance
| | - Thierry Lagrange
- Laboratoire Génome et Développement des Plantes, Université de Perpignan via Domitia, CNRS, UMR5096PerpignanFrance
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Cao PB, Ployet R, Nguyen C, Dupas A, Ladouce N, Martinez Y, Grima-Pettenati J, Marque C, Mounet F, Teulières C. Wood Architecture and Composition Are Deeply Remodeled in Frost Sensitive Eucalyptus Overexpressing CBF/DREB1 Transcription Factors. Int J Mol Sci 2020; 21:ijms21083019. [PMID: 32344718 PMCID: PMC7215815 DOI: 10.3390/ijms21083019] [Citation(s) in RCA: 4] [Impact Index Per Article: 1.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/28/2020] [Revised: 04/20/2020] [Accepted: 04/21/2020] [Indexed: 02/03/2023] Open
Abstract
Eucalypts are the most planted trees worldwide, but most of them are frost sensitive. Overexpressing transcription factors for CRT-repeat binding factors (CBFs) in transgenic Eucalyptus confer cold resistance both in leaves and stems. While wood plays crucial roles in trees and is affected by environmental cues, its potential role in adaptation to cold stress has been neglected. Here, we addressed this question by investigating the changes occurring in wood in response to the overexpression of two CBFs, taking advantage of available transgenic Eucalyptus lines. We performed histological, biochemical, and transcriptomic analyses on xylem samples. CBF ectopic expression led to a reduction of both primary and secondary growth, and triggered changes in xylem architecture with smaller and more frequent vessels and fibers exhibiting reduced lumens. In addition, lignin content and syringyl/guaiacyl (S/G) ratio increased. Consistently, many genes of the phenylpropanoid and lignin branch pathway were upregulated. Most of the features of xylem remodeling induced by CBF overexpression are reminiscent of those observed after long exposure of Eucalyptus trees to chilling temperatures. Altogether, these results suggest that CBF plays a central role in the cross-talk between response to cold and wood formation and that the remodeling of wood is part of the adaptive strategies to face cold stress.
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Affiliation(s)
- Phi Bang Cao
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, UMR 5546, 31320 Castanet-Tolosan, France; (P.B.C.); (R.P.)
- Department of Natural Sciences, Hung Vuong University, Nong Trang Ward, Viet Tri City, Phu Tho Province 29000, Vietnam
| | - Raphaël Ployet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, UMR 5546, 31320 Castanet-Tolosan, France; (P.B.C.); (R.P.)
- Department of Biochemistry, Genetics and Microbiology, Forestry and Agricultural Biotechnology Institute (FABI), University of Pretoria, Pretoria 0002, South Africa
| | - Chien Nguyen
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, UMR 5546, 31320 Castanet-Tolosan, France; (P.B.C.); (R.P.)
- Biotechnology and crop protection Department; Northern Mountainous Agriculture and Forestry Science Institute, Phu Tho 29000, Vietnam
| | - Annabelle Dupas
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, UMR 5546, 31320 Castanet-Tolosan, France; (P.B.C.); (R.P.)
| | - Nathalie Ladouce
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, UMR 5546, 31320 Castanet-Tolosan, France; (P.B.C.); (R.P.)
| | - Yves Martinez
- CMEAB, IFR40 Pôle de Biotechnologie Végétale, 31320 Castanet-Tolosan, France
| | - Jacqueline Grima-Pettenati
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, UMR 5546, 31320 Castanet-Tolosan, France; (P.B.C.); (R.P.)
| | - Christiane Marque
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, UMR 5546, 31320 Castanet-Tolosan, France; (P.B.C.); (R.P.)
| | - Fabien Mounet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, UMR 5546, 31320 Castanet-Tolosan, France; (P.B.C.); (R.P.)
| | - Chantal Teulières
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, UMR 5546, 31320 Castanet-Tolosan, France; (P.B.C.); (R.P.)
- Correspondence:
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Ployet R, Veneziano Labate MT, Regiani Cataldi T, Christina M, Morel M, San Clemente H, Denis M, Favreau B, Tomazello Filho M, Laclau JP, Labate CA, Chaix G, Grima-Pettenati J, Mounet F. A systems biology view of wood formation in Eucalyptus grandis trees submitted to different potassium and water regimes. New Phytol 2019; 223:766-782. [PMID: 30887522 DOI: 10.1111/nph.15802] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.8] [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: 11/10/2018] [Accepted: 02/28/2019] [Indexed: 05/02/2023]
Abstract
Wood production in fast-growing Eucalyptus grandis trees is highly dependent on both potassium (K) fertilization and water availability but the molecular processes underlying wood formation in response to the combined effects of these two limiting factors remain unknown. E. grandis trees were submitted to four combinations of K-fertilization and water supply. Weighted gene co-expression network analysis and MixOmics-based co-regulation networks were used to integrate xylem transcriptome, metabolome and complex wood traits. Functional characterization of a candidate gene was performed in transgenic E. grandis hairy roots. This integrated network-based approach enabled us to identify meaningful biological processes and regulators impacted by K-fertilization and/or water limitation. It revealed that modules of co-regulated genes and metabolites strongly correlated to wood complex traits are in the heart of a complex trade-off between biomass production and stress responses. Nested in these modules, potential new cell-wall regulators were identified, as further confirmed by the functional characterization of EgMYB137. These findings provide new insights into the regulatory mechanisms of wood formation under stressful conditions, pointing out both known and new regulators co-opted by K-fertilization and/or water limitation that may potentially promote adaptive wood traits.
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Affiliation(s)
- Raphael Ployet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, 31326, Castanet-Tolosan, France
| | - Mônica T Veneziano Labate
- Max Feffer Laboratory for Plant Genetics, Department of Genetics, College of Agriculture 'Luiz de Queiroz', University of São Paulo, Av. Pádua Dias 11, PO Box 09, Piracicaba-SP, 13418-900, Brazil
| | - Thais Regiani Cataldi
- Max Feffer Laboratory for Plant Genetics, Department of Genetics, College of Agriculture 'Luiz de Queiroz', University of São Paulo, Av. Pádua Dias 11, PO Box 09, Piracicaba-SP, 13418-900, Brazil
| | - Mathias Christina
- CIRAD, UMR ECO&SOLS, F-34398, Montpellier, France
- Department of Forest Resource, Luiz de Queiroz College of Agriculture, University of São Paulo, Av. Pádua Dias N° 11, Piracicaba, São Paulo, 13418-900, Brazil
| | - Marie Morel
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, 31326, Castanet-Tolosan, France
| | - Hélène San Clemente
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, 31326, Castanet-Tolosan, France
| | - Marie Denis
- CIRAD, UMR AGAP, 34395, Montpellier, Cedex 9, France
- UMR AGAP, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | - Bénédicte Favreau
- CIRAD, UMR AGAP, 34395, Montpellier, Cedex 9, France
- UMR AGAP, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | - Mario Tomazello Filho
- Department of Forest Resource, Luiz de Queiroz College of Agriculture, University of São Paulo, Av. Pádua Dias N° 11, Piracicaba, São Paulo, 13418-900, Brazil
| | - Jean-Paul Laclau
- CIRAD, UMR ECO&SOLS, F-34398, Montpellier, France
- Department of Forest Resource, Luiz de Queiroz College of Agriculture, University of São Paulo, Av. Pádua Dias N° 11, Piracicaba, São Paulo, 13418-900, Brazil
| | - Carlos Alberto Labate
- Max Feffer Laboratory for Plant Genetics, Department of Genetics, College of Agriculture 'Luiz de Queiroz', University of São Paulo, Av. Pádua Dias 11, PO Box 09, Piracicaba-SP, 13418-900, Brazil
| | - Gilles Chaix
- Department of Forest Resource, Luiz de Queiroz College of Agriculture, University of São Paulo, Av. Pádua Dias N° 11, Piracicaba, São Paulo, 13418-900, Brazil
- CIRAD, UMR AGAP, 34395, Montpellier, Cedex 9, France
- UMR AGAP, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | - Jacqueline Grima-Pettenati
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, 31326, Castanet-Tolosan, France
| | - Fabien Mounet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse III, CNRS, UPS, 31326, Castanet-Tolosan, France
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Favreau B, Denis M, Ployet R, Mounet F, Peireira da Silva H, Franceschini L, Laclau JP, Labate C, Carrer H. Distinct leaf transcriptomic response of water deficient Eucalyptus grandis submitted to potassium and sodium fertilization. PLoS One 2019; 14:e0218528. [PMID: 31220144 PMCID: PMC6586347 DOI: 10.1371/journal.pone.0218528] [Citation(s) in RCA: 9] [Impact Index Per Article: 1.8] [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: 12/20/2018] [Accepted: 06/04/2019] [Indexed: 01/06/2023] Open
Abstract
While potassium fertilization increases growth yield in Brazilian eucalyptus plantations, it could also increase water requirements, making trees more vulnerable to drought. Sodium fertilization, which has been shown to promote eucalyptus growth compared to K-deficient trees, could partially mitigate this adverse effect of potassium. However, little is known about the influence of K and Na fertilization on the tree metabolic response to water deficit. The aim of the present study was thus to analyze the transcriptome of leaves sampled from Eucalyptus grandis trees subjected to 37% rainfall reduction, and fertilized with potassium (K), sodium (Na), compared to control trees (C). The multifactorial experiment was set up in a field with a throughfall exclusion system. Transcriptomic analysis was performed on leaves from two-year-old trees, and data analyzed using multifactorial statistical analysis and weighted gene co-expression network analysis (WGCNA). Significant sets of genes were seen to respond to rainfall reduction, in interaction with K or Na fertilization, or to fertilization only (regardless of the water supply regime). The genes were involved in stress signaling, primary and secondary metabolism, secondary cell wall formation and photosynthetic activity. Our focus on key genes related to cation transporters and aquaporins highlighted specific regulation of ion homeostasis, and plant adjustment to water deficit. While water availability significantly affects the transcriptomic response of eucalyptus species, this study points out that the transcriptomic response is highly dependent on the fertilization regime. Our study is based on the first large-scale field trial in a tropical region, specifically designed to study the interaction between water availability and nutrition in eucalyptus. To our knowledge, this is the first global transcriptomic analysis to compare the influence of K and Na fertilization on tree adaptive traits in water deficit conditions.
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Affiliation(s)
- Bénédicte Favreau
- CIRAD, UMR AGAP, Montpellier, France
- AGAP, Université de Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | - Marie Denis
- CIRAD, UMR AGAP, Montpellier, France
- AGAP, Université de Montpellier, CIRAD, INRA, Montpellier SupAgro, Montpellier, France
| | - Raphael Ployet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, Castanet-Tolosan, France
| | - Fabien Mounet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, Castanet-Tolosan, France
| | - Hana Peireira da Silva
- Department of Genetics, Luiz de Queiroz College of Agriculture, University of São Paulo, São Paulo, Brazil
| | - Livia Franceschini
- Department of Genetics, Luiz de Queiroz College of Agriculture, University of São Paulo, São Paulo, Brazil
| | | | - Carlos Labate
- Department of Genetics, Luiz de Queiroz College of Agriculture, University of São Paulo, São Paulo, Brazil
| | - Helaine Carrer
- Department of Biological Sciences, Luiz de Queiroz College of Agriculture, University of São Paulo, São Paulo, Brazil
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Lemaire-Chamley M, Mounet F, Deborde C, Maucourt M, Jacob D, Moing A. NMR-Based Tissular and Developmental Metabolomics of Tomato Fruit. Metabolites 2019; 9:metabo9050093. [PMID: 31075946 PMCID: PMC6571556 DOI: 10.3390/metabo9050093] [Citation(s) in RCA: 15] [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] [Download PDF] [Figures] [Journal Information] [Subscribe] [Scholar Register] [Received: 04/11/2019] [Revised: 04/30/2019] [Accepted: 05/07/2019] [Indexed: 11/30/2022] Open
Abstract
Fruit is a complex organ containing seeds and several interconnected tissues with dedicated roles. However, most biochemical or molecular studies about fleshy fruit development concern the entire fruit, the fruit without seeds, or pericarp only. We studied tomato (Solanum lycopersicum) fruit at four stages of development (12, 20, 35, and 45 days post-anthesis). We separated the seeds and the other tissues, exocarp, mesocarp, columella with placenta and locular tissue, and analyzed them individually using proton NMR metabolomic profiling for the quantification of major polar metabolites, enzymatic analysis of starch, and LC-DAD analysis of isoprenoids. Pericarp tissue represented about half of the entire fruit mass only. The composition of each fruit tissue changed during fruit development. An ANOVA-PCA highlighted common, and specific metabolite trends between tissues e.g., higher contents of chlorogenate in locular tissue and of starch in columella. Euclidian distances based on compositional data showed proximities within and between tissues. Several metabolic regulations differed between tissues as revealed by the comparison of metabolite networks based on correlations between compounds. This work stressed the role of specific tissues less studied than pericarp but that impact fruit organoleptic quality including its shape and taste, and fruit processing quality.
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Affiliation(s)
- Martine Lemaire-Chamley
- UMR1332 Biologie du Fruit et Pathologie, INRA, University Bordeaux, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
| | - Fabien Mounet
- UMR1332 Biologie du Fruit et Pathologie, INRA, University Bordeaux, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
| | - Catherine Deborde
- UMR1332 Biologie du Fruit et Pathologie, INRA, University Bordeaux, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
- Plateforme Métabolome du Centre de Génomique Fonctionnelle Bordeaux, MetaboHUB, IBVM, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
| | - Mickaël Maucourt
- UMR1332 Biologie du Fruit et Pathologie, INRA, University Bordeaux, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
- Plateforme Métabolome du Centre de Génomique Fonctionnelle Bordeaux, MetaboHUB, IBVM, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
| | - Daniel Jacob
- UMR1332 Biologie du Fruit et Pathologie, INRA, University Bordeaux, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
- Plateforme Métabolome du Centre de Génomique Fonctionnelle Bordeaux, MetaboHUB, IBVM, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
| | - Annick Moing
- UMR1332 Biologie du Fruit et Pathologie, INRA, University Bordeaux, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
- Plateforme Métabolome du Centre de Génomique Fonctionnelle Bordeaux, MetaboHUB, IBVM, Centre INRA de Nouvelle Aquitaine-Bordeaux, 71 av Edouard Bourlaux, 33140 Villenave d'Ornon, France.
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Ployet R, Soler M, Carocha V, Ladouce N, Alves A, Rodrigues JC, Harvengt L, Marque C, Teulières C, Grima-Pettenati J, Mounet F. Long cold exposure induces transcriptional and biochemical remodelling of xylem secondary cell wall in Eucalyptus. Tree Physiol 2018. [PMID: 28633295 DOI: 10.1093/treephys/tpx062] [Citation(s) in RCA: 16] [Impact Index Per Article: 2.7] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/13/2023]
Abstract
Although eucalypts are the most planted hardwood trees worldwide, the majority of them are frost sensitive. The recent creation of frost-tolerant hybrids such as Eucalyptus gundal plants (E. gunnii × E. dalrympleana hybrids), now enables the development of industrial plantations in northern countries. Our objective was to evaluate the impact of cold on the wood structure and composition of these hybrids, and on the biosynthetic and regulatory processes controlling their secondary cell-wall (SCW) formation. We used an integrated approach combining histology, biochemical characterization and transcriptomic profiling as well as gene co-expression analyses to investigate xylem tissues from Eucalyptus hybrids exposed to cold conditions. Chilling temperatures triggered the deposition of thicker and more lignified xylem cell walls as well as regulation at the transcriptional level of SCW genes. Most genes involved in lignin biosynthesis, except those specifically dedicated to syringyl unit biosynthesis, were up-regulated. The construction of a co-expression network enabled the identification of both known and potential new SCW transcription factors, induced by cold stress. These regulators at the crossroads between cold signalling and SCW formation are promising candidates for functional studies since they may contribute to the tolerance of E. gunnii × E. dalrympleana hybrids to cold.
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Affiliation(s)
- Raphael Ployet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31326 Castanet-Tolosan, France
| | - Marçal Soler
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31326 Castanet-Tolosan, France
| | - Victor Carocha
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31326 Castanet-Tolosan, France
- Instituto de Tecnologia de Química Biológica (ITQB), Biotecnologia de Células Vegetais, Av. da Republica, 2781-157 Oeiras, Portugal
| | - Nathalie Ladouce
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31326 Castanet-Tolosan, France
| | - Ana Alves
- Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal
| | - José-Carlos Rodrigues
- Centro de Estudos Florestais, Instituto Superior de Agronomia, Universidade de Lisboa, Tapada da Ajuda, 1349-017 Lisboa, Portugal
| | - Luc Harvengt
- FCBA, Biotechnology and Advanced Silviculture Department, Genetics and Biotechnology Team, F-33610 Cestas, France
| | - Christiane Marque
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31326 Castanet-Tolosan, France
| | - Chantal Teulières
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31326 Castanet-Tolosan, France
| | - Jacqueline Grima-Pettenati
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31326 Castanet-Tolosan, France
| | - Fabien Mounet
- Laboratoire de Recherche en Sciences Végétales, Université de Toulouse, CNRS, UPS, 31326 Castanet-Tolosan, France
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8
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Nguyen HC, Cao PB, San Clemente H, Ployet R, Mounet F, Ladouce N, Harvengt L, Marque C, Teulieres C. Special trends in CBF and DREB2 groups in Eucalyptus gunnii vs Eucalyptus grandis suggest that CBF are master players in the trade-off between growth and stress resistance. Physiol Plant 2017; 159:445-467. [PMID: 27861954 DOI: 10.1111/ppl.12529] [Citation(s) in RCA: 11] [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] [Received: 08/25/2016] [Accepted: 09/20/2016] [Indexed: 06/06/2023]
Abstract
Annotation of the Eucalyptus grandis genome showed a large amplification of the dehydration-responsive element binding 1/C-repeat binding factor (DREB1/CBF) group without recent DREB2 gene duplication compared with other plant species. The present annotation of the CBF and DREB2 genes from a draft of the Eucalyptus gunnii genome sequence reveals at least one additional CBF copy in the E. gunnii genome compared with E. grandis, suggesting that this group is still evolving, unlike the DREB2 group. This study aims to investigate the redundancy/neo- or sub-functionalization of the duplicates and the relative involvement of the two groups in abiotic stress responses in both E. grandis and E. gunnii (lower growth but higher cold resistance). A comprehensive transcriptional analysis using high-throughput quantitative real-time polymerase chain reaction (qRT-PCR) was performed on leaves, stems and roots from the two Eucalyptus species after cold, heat or drought treatment. A large CBF cluster accounted for most of the cold response in all the organs, whereas heat and drought responses mainly involved a small CBF cluster and the DREB2 genes. In addition, CBF putative target genes, known to be involved in plant tolerance and development, were found to be cold-regulated. The higher transcript amounts of both the CBF and target genes in the cold tolerant E. gunnii contrasted with the higher CBF induction rates in the fast growing E. grandis. Altogether, the present results, in agreement with previous data about Eucalyptus transgenic lines over-expressing CBF, suggest that these factors, which promote both stress protection and growth limitation, participate in the trade-off between growth and resistance in this woody species.
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Affiliation(s)
- Hong C Nguyen
- Université de Toulouse, UPS, UMR 5546, Plant Research Laboratory (LRSV), Castanet-Tolosan, France
- CNRS, Castanet-Tolosan, France
| | - Phi B Cao
- Hung Vuong University, Nong Trang Ward, Viettri City, Vietnam
| | - Hélène San Clemente
- Université de Toulouse, UPS, UMR 5546, Plant Research Laboratory (LRSV), Castanet-Tolosan, France
- CNRS, Castanet-Tolosan, France
| | - Raphaël Ployet
- Université de Toulouse, UPS, UMR 5546, Plant Research Laboratory (LRSV), Castanet-Tolosan, France
- CNRS, Castanet-Tolosan, France
| | - Fabien Mounet
- Université de Toulouse, UPS, UMR 5546, Plant Research Laboratory (LRSV), Castanet-Tolosan, France
- CNRS, Castanet-Tolosan, France
| | - Nathalie Ladouce
- Université de Toulouse, UPS, UMR 5546, Plant Research Laboratory (LRSV), Castanet-Tolosan, France
- CNRS, Castanet-Tolosan, France
| | - Luc Harvengt
- FCBA Biotechnology and Advanced Silviculture Dept, Genetics & Biotechnology Team, Cestas, France
| | - Christiane Marque
- Université de Toulouse, UPS, UMR 5546, Plant Research Laboratory (LRSV), Castanet-Tolosan, France
- CNRS, Castanet-Tolosan, France
| | - Chantal Teulieres
- Université de Toulouse, UPS, UMR 5546, Plant Research Laboratory (LRSV), Castanet-Tolosan, France
- CNRS, Castanet-Tolosan, France
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9
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Soler M, Plasencia A, Lepikson-Neto J, Camargo ELO, Dupas A, Ladouce N, Pesquet E, Mounet F, Larbat R, Grima-Pettenati J. The Woody-Preferential Gene EgMYB88 Regulates the Biosynthesis of Phenylpropanoid-Derived Compounds in Wood. Front Plant Sci 2016; 7:1422. [PMID: 27713753 PMCID: PMC5032791 DOI: 10.3389/fpls.2016.01422] [Citation(s) in RCA: 6] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/04/2016] [Accepted: 09/06/2016] [Indexed: 05/19/2023]
Abstract
Comparative phylogenetic analyses of the R2R3-MYB transcription factor family revealed that five subgroups were preferentially found in woody species and were totally absent from Brassicaceae and monocots (Soler et al., 2015). Here, we analyzed one of these subgroups (WPS-I) for which no gene had been yet characterized. Most Eucalyptus members of WPS-I are preferentially expressed in the vascular cambium, the secondary meristem responsible for tree radial growth. We focused on EgMYB88, which is the most specifically and highly expressed in vascular tissues, and showed that it behaves as a transcriptional activator in yeast. Then, we functionally characterized EgMYB88 in both transgenic Arabidopsis and poplar plants overexpressing either the native or the dominant repression form (fused to the Ethylene-responsive element binding factor-associated Amphiphilic Repression motif, EAR). The transgenic Arabidopsis lines had no phenotype whereas the poplar lines overexpressing EgMYB88 exhibited a substantial increase in the levels of the flavonoid catechin and of some salicinoid phenolic glycosides (salicortin, salireposide, and tremulacin), in agreement with the increase of the transcript levels of landmark biosynthetic genes. A change in the lignin structure (increase in the syringyl vs. guaiacyl, S/G ratio) was also observed. Poplar lines overexpressing the EgMYB88 dominant repression form did not show a strict opposite phenotype. The level of catechin was reduced, but the levels of the salicinoid phenolic glycosides and the S/G ratio remained unchanged. In addition, they showed a reduction in soluble oligolignols containing sinapyl p-hydroxybenzoate accompanied by a mild reduction of the insoluble lignin content. Altogether, these results suggest that EgMYB88, and more largely members of the WPS-I group, could control in cambium and in the first layers of differentiating xylem the biosynthesis of some phenylpropanoid-derived secondary metabolites including lignin.
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Affiliation(s)
- Marçal Soler
- Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche Scientifique, Université de Toulouse III, Paul SabatierToulouse, France
| | - Anna Plasencia
- Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche Scientifique, Université de Toulouse III, Paul SabatierToulouse, France
| | - Jorge Lepikson-Neto
- Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche Scientifique, Université de Toulouse III, Paul SabatierToulouse, France
| | - Eduardo L. O. Camargo
- Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche Scientifique, Université de Toulouse III, Paul SabatierToulouse, France
| | - Annabelle Dupas
- Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche Scientifique, Université de Toulouse III, Paul SabatierToulouse, France
| | - Nathalie Ladouce
- Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche Scientifique, Université de Toulouse III, Paul SabatierToulouse, France
| | | | - Fabien Mounet
- Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche Scientifique, Université de Toulouse III, Paul SabatierToulouse, France
| | - Romain Larbat
- “Agronomie et Environnement” Nancy-Colmar, Institut National de la Recherche Agronomique, Université de Lorraine UMR1121Vandœuvre-lès-Nancy, France
| | - Jacqueline Grima-Pettenati
- Laboratoire de Recherche en Sciences Végétales, Centre National de la Recherche Scientifique, Université de Toulouse III, Paul SabatierToulouse, France
- *Correspondence: Jacqueline Grima-Pettenati
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10
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Cao PB, Azar S, SanClemente H, Mounet F, Dunand C, Marque G, Marque C, Teulières C. Genome-wide analysis of the AP2/ERF family in Eucalyptus grandis: an intriguing over-representation of stress-responsive DREB1/CBF genes. PLoS One 2015; 10:e0121041. [PMID: 25849589 DOI: 10.1371/journal.pone.0121041] [Citation(s) in RCA: 28] [Impact Index Per Article: 3.1] [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: 12/10/2014] [Accepted: 02/11/2015] [Indexed: 01/02/2023] Open
Abstract
BACKGROUND The AP2/ERF family includes a large number of developmentally and physiologically important transcription factors sharing an AP2 DNA-binding domain. Among them DREB1/CBF and DREB2 factors are known as master regulators respectively of cold and heat/osmotic stress responses. EXPERIMENTAL APPROACHES The manual annotation of AP2/ERF family from Eucalyptus grandis, Malus, Populus and Vitis genomes allowed a complete phylogenetic study for comparing the structure of this family in woody species and the model Arabidopsis thaliana. Expression profiles of the whole groups of EgrDREB1 and EgrDREB2 were investigated through RNAseq database survey and RT-qPCR analyses. RESULTS The structure and the size of the AP2/ERF family show a global conservation for the plant species under comparison. In addition to an expansion of the ERF subfamily, the tree genomes mainly differ with respect to the group representation within the subfamilies. With regard to the E. grandis DREB subfamily, an obvious feature is the presence of 17 DREB1/CBF genes, the maximum reported to date for dicotyledons. In contrast, only six DREB2 have been identified, which is similar to the other plants species under study, except for Malus. All the DREB1/CBF and DREB2 genes from E. grandis are expressed in at least one condition and all are heat-responsive. Regulation by cold and drought depends on the genes but is not specific of one group; DREB1/CBF group is more cold-inducible than DREB2 which is mainly drought responsive. CONCLUSION These features suggest that the dramatic expansion of the DREB1/CBF group might be related to the adaptation of this evergreen tree to climate changes when it expanded in Australia.
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Affiliation(s)
- P B Cao
- Université de Toulouse, UPS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France; CNRS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France
| | - S Azar
- Université de Toulouse, UPS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France; CNRS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France
| | - H SanClemente
- Université de Toulouse, UPS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France; CNRS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France
| | - F Mounet
- Université de Toulouse, UPS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France; CNRS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France
| | - C Dunand
- Université de Toulouse, UPS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France; CNRS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France
| | - G Marque
- Université de Toulouse, UPS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France; CNRS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France
| | - C Marque
- Université de Toulouse, UPS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France; CNRS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France
| | - C Teulières
- Université de Toulouse, UPS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France; CNRS, UMR 5546, LRSV, 24 Chemin de Borde Rouge, Auzeville, BP 42617 31326, Castanet-Tolosan, France
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11
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Mounet F, Moing A, Kowalczyk M, Rohrmann J, Petit J, Garcia V, Maucourt M, Yano K, Deborde C, Aoki K, Bergès H, Granell A, Fernie AR, Bellini C, Rothan C, Lemaire-Chamley M. Down-regulation of a single auxin efflux transport protein in tomato induces precocious fruit development. J Exp Bot 2012; 63:4901-17. [PMID: 22844095 PMCID: PMC3427993 DOI: 10.1093/jxb/ers167] [Citation(s) in RCA: 53] [Impact Index Per Article: 4.4] [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: 05/20/2023]
Abstract
The PIN-FORMED (PIN) auxin efflux transport protein family has been well characterized in the model plant Arabidopsis thaliana, where these proteins are crucial for auxin regulation of various aspects of plant development. Recent evidence indicates that PIN proteins may play a role in fruit set and early fruit development in tomato (Solanum lycopersicum), but functional analyses of PIN-silenced plants failed to corroborate this hypothesis. Here it is demonstrated that silencing specifically the tomato SlPIN4 gene, which is predominantly expressed in tomato flower bud and young developing fruit, leads to parthenocarpic fruits due to precocious fruit development before fertilization. This phenotype was associated with only slight modifications of auxin homeostasis at early stages of flower bud development and with minor alterations of ARF and Aux/IAA gene expression. However, microarray transcriptome analysis and large-scale quantitative RT-PCR profiling of transcription factors in developing flower bud and fruit highlighted differentially expressed regulatory genes, which are potential targets for auxin control of fruit set and development in tomato. In conclusion, this work provides clear evidence that the tomato PIN protein SlPIN4 plays a major role in auxin regulation of tomato fruit set, possibly by preventing precocious fruit development in the absence of pollination, and further gives new insights into the target genes involved in fruit set.
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Affiliation(s)
- Fabien Mounet
- INRA, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Université de Bordeaux, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Present address: UMR 5546, Laboratoire de Recherche en Sciences VégétalesF-31326 Castanet TolosanFrance
| | - Annick Moing
- INRA, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Université de Bordeaux, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Plateforme Métabolome du Centre de Génomique Fonctionnelle Bordeaux, IBVM, Centre INRA de BordeauxF-33140Villenave d’OrnonFrance
| | - Mariusz Kowalczyk
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå UniversitySE-90187 UmeåSweden
- Present address: Institute of Soil Science and Plant Cultivation, Department of Biochemistry and Crop Quality24100 PulawyPoland
| | - Johannes Rohrmann
- Max-Planck Institute for Molecular Plant PhysiologyAm Mühlenberg 1, D-14476 Potsdam-GolmGermany
| | - Johann Petit
- INRA, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Université de Bordeaux, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
| | - Virginie Garcia
- INRA, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Université de Bordeaux, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
| | - Mickaël Maucourt
- INRA, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Université de Bordeaux, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Plateforme Métabolome du Centre de Génomique Fonctionnelle Bordeaux, IBVM, Centre INRA de BordeauxF-33140Villenave d’OrnonFrance
| | - Kentaro Yano
- Meiji University1-1-1 Higashi-Mita, Tama-Ku, Kawasaki, 214-8571Japan
| | - Catherine Deborde
- INRA, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Université de Bordeaux, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Plateforme Métabolome du Centre de Génomique Fonctionnelle Bordeaux, IBVM, Centre INRA de BordeauxF-33140Villenave d’OrnonFrance
| | - Koh Aoki
- Kazusa DNA Research Institute2-6-7 Kazusa-Kamatari, KisarazuJapan
- Present address: Osaka Prefecture University, Environmental and Life Sciences, 1-1 Gakuen-cho, Naka-ku, SakaiOsaka 599-8531Japan
| | - Hélène Bergès
- INRA-Centre National de Ressources Génomiques VégétalesF-31326 Castanet TolosanFrance
| | - Antonio Granell
- Instituto de Biología Molecular y Celular de Plantas, Universidad Politécnica de Valencia-CSIC46022 ValenciaSpain
| | - Alisdair R. Fernie
- Max-Planck Institute for Molecular Plant PhysiologyAm Mühlenberg 1, D-14476 Potsdam-GolmGermany
| | - Catherine Bellini
- Umeå Plant Science Centre, Department of Plant Physiology, Umeå UniversitySE-90187 UmeåSweden
- Institut Jean-Pierre Bourgin, UMR1318-INRA-AgroParisTech, INRA Centre of Versailles-GrignonF-78026 Versailles cedexFrance
| | - Christophe Rothan
- INRA, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Université de Bordeaux, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
| | - Martine Lemaire-Chamley
- INRA, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- Université de Bordeaux, UMR 1332 de Biologie du fruit et PathologieF-33140 Villenave d’OrnonFrance
- To whom correspondence should be addressed. E-mail:
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12
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Girard AL, Mounet F, Lemaire-Chamley M, Gaillard C, Elmorjani K, Vivancos J, Runavot JL, Quemener B, Petit J, Germain V, Rothan C, Marion D, Bakan B. Tomato GDSL1 is required for cutin deposition in the fruit cuticle. Plant Cell 2012; 24:3119-34. [PMID: 22805434 PMCID: PMC3426136 DOI: 10.1105/tpc.112.101055] [Citation(s) in RCA: 141] [Impact Index Per Article: 11.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 05/29/2012] [Revised: 05/29/2012] [Accepted: 06/26/2012] [Indexed: 05/18/2023]
Abstract
The plant cuticle consists of cutin, a polyester of glycerol, hydroxyl, and epoxy fatty acids, covered and filled by waxes. While the biosynthesis of cutin building blocks is well documented, the mechanisms underlining their extracellular deposition remain unknown. Among the proteins extracted from dewaxed tomato (Solanum lycopersicum) peels, we identified GDSL1, a member of the GDSL esterase/acylhydrolase family of plant proteins. GDSL1 is strongly expressed in the epidermis of growing fruit. In GDSL1-silenced tomato lines, we observed a significant reduction in fruit cuticle thickness and a decrease in cutin monomer content proportional to the level of GDSL1 silencing. A significant decrease of wax load was observed only for cuticles of the severely silenced transgenic line. Fourier transform infrared (FTIR) analysis of isolated cutins revealed a reduction in cutin density in silenced lines. Indeed, FTIR-attenuated total reflectance spectroscopy and atomic force microscopy imaging showed that drastic GDSL1 silencing leads to a reduction in ester bond cross-links and to the appearance of nanopores in tomato cutins. Furthermore, immunolabeling experiments attested that GDSL1 is essentially entrapped in the cuticle proper and cuticle layer. These results suggest that GDSL1 is specifically involved in the extracellular deposition of the cutin polyester in the tomato fruit cuticle.
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Affiliation(s)
- Anne-Laure Girard
- Unité Biopolymères, Interactions, Assemblages, Institut National de la Recherche Agronomique, F-44316 Nantes cedex 3, France
| | - Fabien Mounet
- Unité Biopolymères, Interactions, Assemblages, Institut National de la Recherche Agronomique, F-44316 Nantes cedex 3, France
| | - Martine Lemaire-Chamley
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1332 Biologie du Fruit et Pathologie, F-33140 Villenave d’Ornon, France
- Université de Bordeaux, Unité Mixte de Recherche 1332 Biologie du Fruit et Pathologie, F-33140 Villenave d’Ornon, France
| | - Cédric Gaillard
- Unité Biopolymères, Interactions, Assemblages, Institut National de la Recherche Agronomique, F-44316 Nantes cedex 3, France
| | - Khalil Elmorjani
- Unité Biopolymères, Interactions, Assemblages, Institut National de la Recherche Agronomique, F-44316 Nantes cedex 3, France
| | - Julien Vivancos
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1332 Biologie du Fruit et Pathologie, F-33140 Villenave d’Ornon, France
| | - Jean-Luc Runavot
- Unité Biopolymères, Interactions, Assemblages, Institut National de la Recherche Agronomique, F-44316 Nantes cedex 3, France
| | - Bernard Quemener
- Unité Biopolymères, Interactions, Assemblages, Institut National de la Recherche Agronomique, F-44316 Nantes cedex 3, France
| | - Johann Petit
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1332 Biologie du Fruit et Pathologie, F-33140 Villenave d’Ornon, France
- Université de Bordeaux, Unité Mixte de Recherche 1332 Biologie du Fruit et Pathologie, F-33140 Villenave d’Ornon, France
| | - Véronique Germain
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1332 Biologie du Fruit et Pathologie, F-33140 Villenave d’Ornon, France
- Université de Bordeaux, Unité Mixte de Recherche 1332 Biologie du Fruit et Pathologie, F-33140 Villenave d’Ornon, France
| | - Christophe Rothan
- Institut National de la Recherche Agronomique, Unité Mixte de Recherche 1332 Biologie du Fruit et Pathologie, F-33140 Villenave d’Ornon, France
- Université de Bordeaux, Unité Mixte de Recherche 1332 Biologie du Fruit et Pathologie, F-33140 Villenave d’Ornon, France
| | - Didier Marion
- Unité Biopolymères, Interactions, Assemblages, Institut National de la Recherche Agronomique, F-44316 Nantes cedex 3, France
| | - Bénédicte Bakan
- Unité Biopolymères, Interactions, Assemblages, Institut National de la Recherche Agronomique, F-44316 Nantes cedex 3, France
- Address correspondence to
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13
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Mounet F, Moing A, Garcia V, Petit J, Maucourt M, Deborde C, Bernillon S, Le Gall G, Colquhoun I, Defernez M, Giraudel JL, Rolin D, Rothan C, Lemaire-Chamley M. Gene and metabolite regulatory network analysis of early developing fruit tissues highlights new candidate genes for the control of tomato fruit composition and development. Plant Physiol 2009; 149:1505-28. [PMID: 19144766 PMCID: PMC2649409 DOI: 10.1104/pp.108.133967] [Citation(s) in RCA: 142] [Impact Index Per Article: 9.5] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 12/10/2008] [Accepted: 01/10/2009] [Indexed: 05/18/2023]
Abstract
Variations in early fruit development and composition may have major impacts on the taste and the overall quality of ripe tomato (Solanum lycopersicum) fruit. To get insights into the networks involved in these coordinated processes and to identify key regulatory genes, we explored the transcriptional and metabolic changes in expanding tomato fruit tissues using multivariate analysis and gene-metabolite correlation networks. To this end, we demonstrated and took advantage of the existence of clear structural and compositional differences between expanding mesocarp and locular tissue during fruit development (12-35 d postanthesis). Transcriptome and metabolome analyses were carried out with tomato microarrays and analytical methods including proton nuclear magnetic resonance and liquid chromatography-mass spectrometry, respectively. Pairwise comparisons of metabolite contents and gene expression profiles detected up to 37 direct gene-metabolite correlations involving regulatory genes (e.g. the correlations between glutamine, bZIP, and MYB transcription factors). Correlation network analyses revealed the existence of major hub genes correlated with 10 or more regulatory transcripts and embedded in a large regulatory network. This approach proved to be a valuable strategy for identifying specific subsets of genes implicated in key processes of fruit development and metabolism, which are therefore potential targets for genetic improvement of tomato fruit quality.
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Affiliation(s)
- Fabien Mounet
- INRA-UMR 619 Biologie du Fruit, Centre de Bordeaux, F-33140 Villenave d'Ornon, France
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Alhagdow M, Mounet F, Gilbert L, Nunes-Nesi A, Garcia V, Just D, Petit J, Beauvoit B, Fernie AR, Rothan C, Baldet P. Silencing of the mitochondrial ascorbate synthesizing enzyme L-galactono-1,4-lactone dehydrogenase affects plant and fruit development in tomato. Plant Physiol 2007; 145:1408-22. [PMID: 17921340 PMCID: PMC2151702 DOI: 10.1104/pp.107.106500] [Citation(s) in RCA: 112] [Impact Index Per Article: 6.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/31/2007] [Accepted: 09/25/2007] [Indexed: 05/18/2023]
Abstract
L-Galactono-1,4-lactone dehydrogenase (EC 1.3.2.3) catalyzes the last step in the main pathway of vitamin C (L-ascorbic acid) biosynthesis in higher plants. In this study, we first characterized the spatial and temporal expression of SlGalLDH in several organs of tomato (Solanum lycopersicum) plants in parallel with the ascorbate content. P(35S):Slgalldh(RNAi) silenced transgenic tomato lines were then generated using an RNAi strategy to evaluate the effect of any resulting modification of the ascorbate pool on plant and fruit development. In all P(35S):Slgalldh(RNAi) plants with reduced SlGalLDH transcript and activity, plant growth rate was decreased. Plants displaying the most severe effects (dwarf plants with no fruit) were excluded from further analysis. The most affected lines studied exhibited up to an 80% reduction in SlGalLDH activity and showed a strong reduction in leaf and fruit size, mainly as a consequence of reduced cell expansion. This was accompanied by significant changes in mitochondrial function and altered ascorbate redox state despite the fact that the total ascorbate content remained unchanged. By using a combination of transcriptomic and metabolomic approaches, we further demonstrated that several primary, like the tricarboxylic acid cycle, as well as secondary metabolic pathways related to stress response were modified in leaves and fruit of P(35S):Slgalldh(RNAi) plants. When taken together, this work confirms the complexity of ascorbate regulation and its link with plant metabolism. Moreover, it strongly suggests that, in addition to ascorbate synthesis, GalLDH could play an important role in the regulation of cell growth-related processes in plants.
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Affiliation(s)
- Moftah Alhagdow
- Institut National de la Recherche Agronomique, Université Bordeaux 1, Université Victor Ségalen-Bordeaux 2, BP 81, 33883 Villenave d'Ornon cedex, France
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Baldet P, Hernould M, Laporte F, Mounet F, Just D, Mouras A, Chevalier C, Rothan C. The expression of cell proliferation-related genes in early developing flowers is affected by a fruit load reduction in tomato plants. J Exp Bot 2006; 57:961-70. [PMID: 16488916 DOI: 10.1093/jxb/erj082] [Citation(s) in RCA: 42] [Impact Index Per Article: 2.3] [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
Changes in photoassimilate partitioning between source and sink organs significantly affect fruit development and size. In this study, a comparison was made of tomato plants (Solanum lycopersicum L.) grown under a low fruit load (one fruit per truss, L1 plants) and under a standard fruit load (five fruits per truss, L5 plants), at morphological, biochemical, and molecular levels. Fruit load reduction resulted in increased photoassimilate availability in the plant and in increased growth rates in all plant organs analysed (root, stem, leaf, flower, and fruit). Larger flower and fruit size in L1 plants were correlated with higher cell number in the pre-anthesis ovary. This was probably due to the acceleration of the flower growth rate since other flower developmental parameters (schedule and time-course) remained otherwise unaffected. Using RT-PCR, it was shown that the transcript levels of CYCB2;1 (cyclin) and CDKB2;1 (cyclin-dependent kinase), two mitosis-specific genes, strongly increased early in developing flower buds. Remarkably, the transcript abundance of CYCD3;1, a D-type cyclin potentially involved in cell cycle regulation in response to mitogenic signals, also increased by more than 5-fold at very early stages of L1 flower development. By contrast, transcripts from fw2.2, a putative negative regulator of cell division in tomato fruit, strongly decreased in developing flower bud, as confirmed by in situ hybridization studies. Taken together, these results suggest that changes in carbohydrate partitioning could control fruit size through the regulation of cell proliferation-related genes at very early stages of flower development.
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Affiliation(s)
- Pierre Baldet
- UMR 619 Physiologie et Biotechnologie Végétales, Institut National de la Recherche Agronomique, Universités Bordeaux 1 et 2, Centre de Recherche de Bordeaux, BP 81, F-33883 Villenave d'Ornon Cedex, France.
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Mounet F, Soula P, Concina P, Baradat G, Cérène A. [Heart valve diseases specific in rheumatoid polyarthritis. Apropos of 2 cases]. Arch Mal Coeur Vaiss 1997; 90:987-989. [PMID: 9339261] [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] [Subscribe] [Scholar Register] [Indexed: 05/22/2023]
Abstract
Rheumatoid nodules represent a rare cardiac valvular involvement in rheumatoid arthritis. Patients are usually asymptomatic. We report two cases of such involvement: one presented as a tumour implanted on the mitral valve, with systemic embolisation; the other presented as aortic regurgitation with acute heart failure. Surgical treatment was performed in both cases. Histological examination revealed typical rheumatoid nodules. The authors discuss valvular involvement in rheumatoid arthritis.
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Affiliation(s)
- F Mounet
- Service de chirurgie cardiaque, CHD Félix-Guyon, Saint-Denis
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