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Main O, Jacquemot MP, Griveau Y, Guillaume S, Demonceaux C, Lopez-Marnet PL, Rey S, Fargier S, Sartre P, Montagnier C, Uijttewaal A, Mangel N, Meunier F, Reymond M, Méchin V, Coursol S. Precise control of water stress in the field reveals different response thresholds for forage yield and digestibility of maize hybrids. Front Plant Sci 2023; 14:1142462. [PMID: 36998698 PMCID: PMC10043421 DOI: 10.3389/fpls.2023.1142462] [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] [Figures] [Subscribe] [Scholar Register] [Received: 01/11/2023] [Accepted: 02/14/2023] [Indexed: 06/19/2023]
Abstract
INTRODUCTION With dwindling global freshwater supplies and increasing water stress, agriculture is coming under increasing pressure to reduce water use. Plant breeding requires high analytical capabilities. For this reason, near-infrared spectroscopy (NIRS) has been used to develop prediction equations for whole-plant samples, particularly for predicting dry matter digestibility, which has a major impact on the energy value of forage maize hybrids and is required for inclusion in the official French catalogue. Although the historical NIRS equations have long been used routinely in seed company breeding programmes, they do not predict all variables with the same accuracy. In addition, little is known about how accurate their predictions are under different water stress-environments. METHODS Here, we examined the effects of water stress and stress intensity on agronomic, biochemical, and NIRS predictive values in a set of 13 modern S0-S1 forage maize hybrids under four different environmental conditions resulting from the combination of a northern and southern location and two monitored water stress levels in the south. RESULTS First, we compared the reliability of NIRS predictions for basic forage quality traits obtained using the historical NIRS predictive equations and the new equations we recently developed. We found that NIRS predicted values were affected to varying degrees by environmental conditions. We also showed that forage yield gradually decreased as a function of water stress, whereas both dry matter and cell wall digestibilities increased regardless of the intensity of water stress, with variability among the tested varieties decreasing under the most stressed conditions. DISCUSSION By combining forage yield and dry matter digestibility, we were able to quantify digestible yield and identify varieties with different strategies for coping with water stress, raising the exciting possibility that important potential selection targets still exist. Finally, from a farmer's perspective, we were able to show that late silage harvest has no effect on dry matter digestibility and that moderate water stress does not necessarily result in a loss of digestible yield.
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Affiliation(s)
- Oscar Main
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Marie-Pierre Jacquemot
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Yves Griveau
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Sophie Guillaume
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Claire Demonceaux
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Paul-Louis Lopez-Marnet
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Sébastien Rey
- Unité Expérimentale DiaScope, INRAE, Mauguio, France
| | | | - Pascal Sartre
- Unité Expérimentale DiaScope, INRAE, Mauguio, France
| | | | - Anthony Uijttewaal
- ARVALIS – Institut du végétal, Station expérimentale de La Jaillière, Loireauxence, France
| | - Nathalie Mangel
- ARVALIS – Institut du végétal, Station expérimentale, Boigneville, France
| | | | - Matthieu Reymond
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Valérie Méchin
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Sylvie Coursol
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
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Rozière J, Guichard C, Brunaud V, Martin ML, Coursol S. A comprehensive map of preferentially located motifs reveals distinct proximal cis-regulatory sequences in plants. Front Plant Sci 2022; 13:976371. [PMID: 36311095 PMCID: PMC9597372 DOI: 10.3389/fpls.2022.976371] [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] [Figures] [Subscribe] [Scholar Register] [Received: 06/23/2022] [Accepted: 09/21/2022] [Indexed: 06/16/2023]
Abstract
Identification of cis-regulatory sequences controlling gene expression is an arduous challenge that is being actively explored to discover key genetic factors responsible for traits of agronomic interest. Here, we used a genome-wide de novo approach to investigate preferentially located motifs (PLMs) in the proximal cis-regulatory landscape of Arabidopsis thaliana and Zea mays. We report three groups of PLMs in both the 5'- and 3'-gene-proximal regions and emphasize conserved PLMs in both species, particularly in the 3'-gene-proximal region. Comparison with resources from transcription factor and microRNA binding sites shows that 79% of the identified PLMs are unassigned, although some are supported by MNase-defined cistrome occupancy analysis. Enrichment analyses further reveal that unassigned PLMs provide functional predictions that differ from those derived from transcription factor and microRNA binding sites. Our study provides a comprehensive map of PLMs and demonstrates their potential utility for future characterization of orphan genes in plants.
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Affiliation(s)
- Julien Rozière
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France
- Université de Paris Cité, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
| | - Cécile Guichard
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France
- Université de Paris Cité, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France
| | - Véronique Brunaud
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France
- Université de Paris Cité, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France
| | - Marie-Laure Martin
- Université Paris-Saclay, CNRS, INRAE, Université Evry, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France
- Université de Paris Cité, Institute of Plant Sciences Paris-Saclay (IPS2), Gif sur Yvette, France
- Université Paris-Saclay, INRAE, AgroParisTech, UMR MIA-Paris-Saclay, Palaiseau, France
| | - Sylvie Coursol
- Université Paris-Saclay, INRAE, AgroParisTech, Institut Jean-Pierre Bourgin (IJPB), Versailles, France
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El Hage F, Virlouvet L, Lopez-Marnet PL, Griveau Y, Jacquemot MP, Coursol S, Méchin V, Reymond M. Responses of Maize Internode to Water Deficit Are Different at the Biochemical and Histological Levels. Front Plant Sci 2021; 12:628960. [PMID: 33719300 PMCID: PMC7952650 DOI: 10.3389/fpls.2021.628960] [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] [Figures] [Subscribe] [Scholar Register] [Received: 11/13/2020] [Accepted: 01/22/2021] [Indexed: 06/12/2023]
Abstract
Maize feeding value is strongly linked to plant digestibility. Cell wall composition and structure can partly explain cell wall digestibility variations, and we recently showed that tissue lignification and lignin spatial distribution also contribute to cell wall digestibility variations. Although the genetic determinism of digestibility and cell wall composition has been studied for more than 20 years, little is available concerning that of tissue lignification. Moreover, maize yield is negatively impacted by water deficit, and we newly highlighted the impact of water deficit on cell wall digestibility and composition together with tissue lignification. Consequently, the aim of this study was to explore the genetic mechanisms of lignin distribution in link with cell wall composition and digestibility under contrasted water regimes. Maize internodes from a recombinant inbred line (RIL) population grown in field trials with contrasting irrigation scenarios were biochemically and histologically quantified. Results obtained showed that biochemical and histological traits have different response thresholds to water deficit. Histological profiles were therefore only modified under pronounced water deficit, while most of the biochemical traits responded whatever the strength of the water deficit. Three main clusters of quantitative trait locus (QTL) for histological traits were detected. Interestingly, overlap between the biochemical and histological clusters is rare, and one noted especially colocalizations between histological QTL/clusters and QTL for p-coumaric acid content. These findings reinforce the suspected role of tissue p-coumaroylation for both the agronomic properties of plants as well as their digestibility.
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Affiliation(s)
- Fadi El Hage
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
- Ecole Doctorale n° 567: Science du Végétal: Du gène à l’écosystème, Université Paris-Saclay, Orsay, France
| | - Laetitia Virlouvet
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
| | - Paul-Louis Lopez-Marnet
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
- Ecole Doctorale n° 581: ABIES, Paris, France
| | - Yves Griveau
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
| | - Marie-Pierre Jacquemot
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
| | - Sylvie Coursol
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
| | - Valérie Méchin
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
| | - Matthieu Reymond
- Institut Jean-Pierre Bourgin, INRAE, AgroParisTech, Université Paris-Saclay, Versailles, France
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Cuello C, Baldy A, Brunaud V, Joets J, Delannoy E, Jacquemot MP, Botran L, Griveau Y, Guichard C, Soubigou-Taconnat L, Martin-Magniette ML, Leroy P, Méchin V, Reymond M, Coursol S. A systems biology approach uncovers a gene co-expression network associated with cell wall degradability in maize. PLoS One 2019; 14:e0227011. [PMID: 31891625 PMCID: PMC6938352 DOI: 10.1371/journal.pone.0227011] [Citation(s) in RCA: 1] [Impact Index Per Article: 0.2] [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: 08/09/2019] [Accepted: 12/09/2019] [Indexed: 11/18/2022] Open
Abstract
Understanding the mechanisms triggering variation of cell wall degradability is a prerequisite to improving the energy value of lignocellulosic biomass for animal feed or biorefinery. Here, we implemented a multiscale systems approach to shed light on the genetic basis of cell wall degradability in maize. We demonstrated that allele replacement in two pairs of near-isogenic lines at a region encompassing a major quantitative trait locus (QTL) for cell wall degradability led to phenotypic variation of a similar magnitude and sign to that expected from a QTL analysis of cell wall degradability in the F271 × F288 recombinant inbred line progeny. Using DNA sequences within the QTL interval of both F271 and F288 inbred lines and Illumina RNA sequencing datasets from internodes of the selected near-isogenic lines, we annotated the genes present in the QTL interval and provided evidence that allelic variation at the introgressed QTL region gives rise to coordinated changes in gene expression. The identification of a gene co-expression network associated with cell wall-related trait variation revealed that the favorable F288 alleles exploit biological processes related to oxidation-reduction, regulation of hydrogen peroxide metabolism, protein folding and hormone responses. Nested in modules of co-expressed genes, potential new cell-wall regulators were identified, including two transcription factors of the group VII ethylene response factor family, that could be exploited to fine-tune cell wall degradability. Overall, these findings provide new insights into the regulatory mechanisms by which a major locus influences cell wall degradability, paving the way for its map-based cloning in maize.
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Affiliation(s)
- Clément Cuello
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Aurélie Baldy
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Véronique Brunaud
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Saclay, Gif-sur-Yvette, France
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Diderot, Sorbonne Paris-Cité, Gif-sur-Yvette, France
| | - Johann Joets
- Génétique Quantitative et Evolution—Le Moulon, INRA, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, Gif-Sur-Yvette, France
| | - Etienne Delannoy
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Saclay, Gif-sur-Yvette, France
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Diderot, Sorbonne Paris-Cité, Gif-sur-Yvette, France
| | - Marie-Pierre Jacquemot
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Lucy Botran
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Yves Griveau
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Cécile Guichard
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Saclay, Gif-sur-Yvette, France
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Diderot, Sorbonne Paris-Cité, Gif-sur-Yvette, France
| | - Ludivine Soubigou-Taconnat
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Saclay, Gif-sur-Yvette, France
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Diderot, Sorbonne Paris-Cité, Gif-sur-Yvette, France
| | - Marie-Laure Martin-Magniette
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Sud, Université Evry, Université Paris-Saclay, Gif-sur-Yvette, France
- Institute of Plant Sciences Paris-Saclay, CNRS, INRA, Université Paris-Diderot, Sorbonne Paris-Cité, Gif-sur-Yvette, France
- UMR MIA-Paris, AgroParisTech, INRA, Université Paris-Saclay, Paris, France
| | | | - Valérie Méchin
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Matthieu Reymond
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Sylvie Coursol
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
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Virlouvet L, El Hage F, Griveau Y, Jacquemot MP, Gineau E, Baldy A, Legay S, Horlow C, Combes V, Bauland C, Palafre C, Falque M, Moreau L, Coursol S, Méchin V, Reymond M. Water Deficit-Responsive QTLs for Cell Wall Degradability and Composition in Maize at Silage Stage. Front Plant Sci 2019; 10:488. [PMID: 31105719 PMCID: PMC6494970 DOI: 10.3389/fpls.2019.00488] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.6] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [Track Full Text] [Figures] [Subscribe] [Scholar Register] [Received: 11/29/2018] [Accepted: 03/29/2019] [Indexed: 06/09/2023]
Abstract
The use of lignocellulosic biomass for animal feed or biorefinery requires the optimization of its degradability. Moreover, biomass crops need to be better adapted to the changing climate and in particular to periods of drought. Although the negative impact of water deficit on biomass yield has often been mentioned, its impact on biomass quality has only been recently reported in a few species. In the present study, we combined the mapping power of a maize recombinant inbred line population with robust near infrared spectroscopy predictive equations to track the response to water deficit of traits associated with biomass quality. The population was cultivated under two contrasted water regimes over 3 consecutive years in the south of France and harvested at silage stage. We showed that cell wall degradability and β-O-4-linked H lignin subunits were increased in response to water deficit, while lignin and p-coumaric acid contents were reduced. A mixed linear model was fitted to map quantitative trait loci (QTLs) for agronomical and cell wall-related traits. These QTLs were categorized as "constitutive" (QTL with an effect whatever the irrigation condition) or "responsive" (QTL involved in the response to water deficit) QTLs. Fifteen clusters of QTLs encompassed more than two third of the 213 constitutive QTLs and 13 clusters encompassed more than 60% of the 149 responsive QTLs. Interestingly, we showed that only half of the responsive QTLs co-localized with constitutive and yield QTLs, suggesting that specific genetic factors support biomass quality response to water deficit. Overall, our results demonstrate that water deficit favors cell wall degradability and that breeding of varieties that reconcile improved drought-tolerance and biomass degradability is possible.
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Affiliation(s)
- Laëtitia Virlouvet
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Fadi El Hage
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
- Univ. Paris-Sud, Université Paris-Saclay, Orsay, France
| | - Yves Griveau
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Marie-Pierre Jacquemot
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Emilie Gineau
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Aurélie Baldy
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Sylvain Legay
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Christine Horlow
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Valérie Combes
- Génétique Quantitative et Evolution - Le Moulon, INRA, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Cyril Bauland
- Génétique Quantitative et Evolution - Le Moulon, INRA, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Carine Palafre
- Unité Expérimentale du Maïs, INRA, Saint-Martin-de-Hinx, France
| | - Matthieu Falque
- Génétique Quantitative et Evolution - Le Moulon, INRA, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Laurence Moreau
- Génétique Quantitative et Evolution - Le Moulon, INRA, Université Paris-Sud, CNRS, AgroParisTech, Université Paris-Saclay, Gif-sur-Yvette, France
| | - Sylvie Coursol
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Valérie Méchin
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
| | - Matthieu Reymond
- Institut Jean-Pierre Bourgin, INRA, AgroParisTech, CNRS, Université Paris-Saclay, Versailles, France
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El Hage F, Legland D, Borrega N, Jacquemot MP, Griveau Y, Coursol S, Méchin V, Reymond M. Tissue Lignification, Cell Wall p-Coumaroylation and Degradability of Maize Stems Depend on Water Status. J Agric Food Chem 2018; 66:4800-4808. [PMID: 29690760 DOI: 10.1021/acs.jafc.7b05755] [Citation(s) in RCA: 4] [Impact Index Per Article: 0.7] [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: 05/12/2023]
Abstract
Water supply and valorization are two urgent issues in the utilization of maize biomass in the context of climate change and replacement of fossil resources. Maximizing maize biomass valorization is of interest to make biofuel conversion competitive, and to increase forage energetic value for animal fodder. One way to estimate biomass valorization is to quantify cell wall degradability. In this study, we evaluated the impact of water supply on cell wall degradability, cell wall contents and structure, and distribution of lignified cell types in maize internodes using dedicated high-throughput tools to effectively phenotype maize internodes from 11 inbred lines under two contrasting irrigation scenarios in field trials over three years. Overall, our results clearly showed that water deficit induced significant changes in lignin content and distribution along with a reduction in lignin p-coumaroylation, thereby impacting cell wall degradability. Additionally, we also observed that responses to a water deficit varied between the lines examined, underscoring biochemical and histological target traits for plant breeding.
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Affiliation(s)
- F El Hage
- UMR 1318, Institut Jean-Pierre Bourgin, INRA-AgroParisTech, CNRS, Universite Paris-Saclay , 78026 Versailles Cedex , France
- École Doctorale 567 Sciences du Vegetal , University Paris-Sud, University of Paris-Saclay , bat 360 , Orsay Cedex 91405 , France
| | - D Legland
- UR1268 Biopolymères, Interactions et Assemblages, INRA , 44 316 Nantes Cedex 3, France
| | - N Borrega
- UMR 1318, Institut Jean-Pierre Bourgin, INRA-AgroParisTech, CNRS, Universite Paris-Saclay , 78026 Versailles Cedex , France
| | - M-P Jacquemot
- UMR 1318, Institut Jean-Pierre Bourgin, INRA-AgroParisTech, CNRS, Universite Paris-Saclay , 78026 Versailles Cedex , France
| | - Y Griveau
- UMR 1318, Institut Jean-Pierre Bourgin, INRA-AgroParisTech, CNRS, Universite Paris-Saclay , 78026 Versailles Cedex , France
| | - S Coursol
- UMR 1318, Institut Jean-Pierre Bourgin, INRA-AgroParisTech, CNRS, Universite Paris-Saclay , 78026 Versailles Cedex , France
| | - V Méchin
- UMR 1318, Institut Jean-Pierre Bourgin, INRA-AgroParisTech, CNRS, Universite Paris-Saclay , 78026 Versailles Cedex , France
| | - M Reymond
- UMR 1318, Institut Jean-Pierre Bourgin, INRA-AgroParisTech, CNRS, Universite Paris-Saclay , 78026 Versailles Cedex , France
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Coursol S, Fromentin J, Noirot E, Brière C, Robert F, Morel J, Liang YK, Lherminier J, Simon-Plas F. Long-chain bases and their phosphorylated derivatives differentially regulate cryptogein-induced production of reactive oxygen species in tobacco (Nicotiana tabacum) BY-2 cells. New Phytol 2015; 205:1239-1249. [PMID: 25303640 DOI: 10.1111/nph.13094] [Citation(s) in RCA: 13] [Impact Index Per Article: 1.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 07/25/2014] [Accepted: 09/06/2014] [Indexed: 06/04/2023]
Abstract
The proteinaceous elicitor cryptogein triggers defence reactions in Nicotiana tabacum (tobacco) through a signalling cascade, including the early production of reactive oxygen species (ROS) by the plasma membrane (PM)-located tobacco respiratory burst oxidase homologue D (NtRbohD). Sphingolipid long-chain bases (LCBs) are emerging as potent positive regulators of plant defence-related mechanisms. This led us to question whether both LCBs and their phosphorylated derivatives (LCB-Ps) are involved in the early signalling process triggered by cryptogein in tobacco BY-2 cells. Here, we showed that cryptogein-induced ROS production was inhibited by LCB kinase (LCBK) inhibitors. Additionally, Arabidopsis thaliana sphingosine kinase 1 and exogenously supplied LCB-Ps increased cryptogein-induced ROS production, whereas exogenously supplied LCBs had a strong opposite effect, which was not driven by a reduction in cellular viability. Immunogold-electron microscopy assay also revealed that LCB-Ps are present in the PM, which fits well with the presence of a high LCBK activity associated with this fraction. Our data demonstrate that LCBs and LCB-Ps differentially regulate cryptogein-induced ROS production in tobacco BY-2 cells, and support a model in which a cooperative synergism between LCBK/LCB-Ps and NtRbohD/ROS in the cryptogein signalling pathway is likely at the PM in tobacco BY-2 cells.
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Affiliation(s)
- Sylvie Coursol
- INRA, Institut Jean-Pierre Bourgin, UMR 1318, ERL CNRS 3559, Saclay Plant Sciences, RD10, F-78026, Versailles, France
- AgroParisTech, Institut Jean-Pierre Bourgin, UMR 1318, ERL CNRS 3559, Saclay Plant Sciences, RD10, F-78026, Versailles, France
| | - Jérôme Fromentin
- INRA, UMR 1347 Agroécologie, ERL CNRS 6300, BP 86510, F-21065, Dijon Cedex, France
| | - Elodie Noirot
- INRA, UMR 1347 Agroécologie, ERL CNRS 6300, BP 86510, F-21065, Dijon Cedex, France
| | - Christian Brière
- Laboratoire de Recherche en Sciences Végétales, UMR 5546, Université de Toulouse, BP 42617, F-31326, Castanet-Tolosan, France
- Laboratoire de Recherche en Sciences Végétales, CNRS, UMR 5546, BP 42617, F-31326, Castanet-Tolosan, France
| | - Franck Robert
- INRA, UMR 1347 Agroécologie, ERL CNRS 6300, BP 86510, F-21065, Dijon Cedex, France
| | - Johanne Morel
- INRA, UMR 1347 Agroécologie, ERL CNRS 6300, BP 86510, F-21065, Dijon Cedex, France
| | - Yun-Kuan Liang
- State Key Laboratory of Hybrid Rice, College of Life Sciences, Wuhan University, Wuhan, 430072, China
| | - Jeannine Lherminier
- INRA, UMR 1347 Agroécologie, ERL CNRS 6300, BP 86510, F-21065, Dijon Cedex, France
| | - Françoise Simon-Plas
- INRA, UMR 1347 Agroécologie, ERL CNRS 6300, BP 86510, F-21065, Dijon Cedex, France
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Ng CKY, Coursol S. New insights into phospholipase d and sphingosine kinase activation in Arabidopsis. Front Physiol 2012; 3:67. [PMID: 22470350 PMCID: PMC3313476 DOI: 10.3389/fphys.2012.00067] [Citation(s) in RCA: 3] [Impact Index Per Article: 0.3] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Track Full Text] [Download PDF] [Journal Information] [Subscribe] [Scholar Register] [Received: 03/09/2012] [Accepted: 03/09/2012] [Indexed: 11/17/2022] Open
Affiliation(s)
- Carl K-Y Ng
- School of Biology and Environmental Science, University College Dublin Dublin, Ireland
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9
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Abstract
• Sphingolipids are emerging as important mediators of cellular and developmental processes in plants, and advances in lipidomics have yielded a wealth of information on the composition of plant sphingolipidomes. Studies using Arabidopsis thaliana showed that the dihydroxy long-chain base (LCB) is desaturated at carbon position 8 (d18:1(Δ8)). This raised important questions on the role(s) of sphingosine (d18:1(Δ4)) and sphingosine-1-phosphate (d18:1(Δ4)-P) in plants, as these LCBs appear to be absent in A. thaliana. • Here, we surveyed 21 species from various phylogenetic groups to ascertain the position of desaturation of the d18:1 LCB, in order to gain further insights into the prevalence of d18:1(Δ4) and d18:1(Δ8) in plants. • Our results showed that d18:1(Δ8) is common in gymnosperms, whereas d18:1(Δ4) is widespread within nonseed land plants and the Poales, suggesting that d18:1(Δ4) is evolutionarily more ancient than d18:1(Δ8) in Viridiplantae. Additionally, phylogenetic analysis indicated that the sphingolipid Δ4-desaturases from Viridiplantae form a monophyletic group, with Angiosperm sequences falling into two distinct clades, the Eudicots and the Poales. • We propose that efforts to elucidate the role(s) of d18:1(Δ4) and d18:1(Δ4)-P should focus on genetically tractable Viridiplantae species where the d18:1 LCB is desaturated at carbon position 4.
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Affiliation(s)
- M Nurul Islam
- School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland
| | | | - Sylvie Coursol
- INRA, UMR 320/UMR 8120 Génétique Végétale, F-91190 Gif-sur-Yvette, France
| | - Carl K-Y Ng
- School of Biology and Environmental Science, University College Dublin, Belfield, Dublin 4, Ireland
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10
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Virlouvet L, Jacquemot MP, Gerentes D, Corti H, Bouton S, Gilard F, Valot B, Trouverie J, Tcherkez G, Falque M, Damerval C, Rogowsky P, Perez P, Noctor G, Zivy M, Coursol S. The ZmASR1 protein influences branched-chain amino acid biosynthesis and maintains kernel yield in maize under water-limited conditions. Plant Physiol 2011; 157:917-36. [PMID: 21852416 PMCID: PMC3192578 DOI: 10.1104/pp.111.176818] [Citation(s) in RCA: 78] [Impact Index Per Article: 6.0] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 03/22/2011] [Accepted: 08/04/2011] [Indexed: 05/02/2023]
Abstract
Abscisic acid-, stress-, and ripening-induced (ASR) proteins were first described about 15 years ago as accumulating to high levels during plant developmental processes and in response to diverse stresses. Currently, the effects of ASRs on water deficit tolerance and the ways in which their physiological and biochemical functions lead to this stress tolerance remain poorly understood. Here, we characterized the ASR gene family from maize (Zea mays), which contains nine paralogous genes, and showed that maize ASR1 (ZmASR1) was encoded by one of the most highly expressed paralogs. Ectopic expression of ZmASR1 had a large overall impact on maize yield that was maintained under water-limited stress conditions in the field. Comparative transcriptomic and proteomic analyses of wild-type and ZmASR1-overexpressing leaves led to the identification of three transcripts and 16 proteins up- or down-regulated by ZmASR1. The majority of them were involved in primary and/or cellular metabolic processes, including branched-chain amino acid (BCAA) biosynthesis. Metabolomic and transcript analyses further indicated that ZmASR1-overexpressing plants showed a decrease in BCAA compounds and changes in BCAA-related gene expression in comparison with wild-type plants. Interestingly, within-group correlation matrix analysis revealed a close link between 13 decreased metabolites in ZmASR1-overexpressing leaves, including two BCAAs. Among these 13 metabolites, six were previously shown to be negatively correlated to biomass, suggesting that ZmASR1-dependent regulation of these 13 metabolites might contribute to regulate leaf growth, resulting in improvement in kernel yield.
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Affiliation(s)
| | | | | | | | | | | | | | | | | | | | | | | | | | | | | | - Sylvie Coursol
- Université Paris-Sud, UMR 320/UMR 8120 Génétique Végétale, F–91190 Gif-sur-Yvette, France (L.V.); INRA, UMR 320/UMR 8120 Génétique Végétale, F–91190 Gif-sur-Yvette, France (M.-P.J., H.C., S.B., B.V., J.T., M.F., S.C.); Biogemma Auvergne, F–63028 Clermont-Ferrand cedex, France (D.G., P.P.); CNRS, UMR 8618 Institut de Biotechnologie des Plantes, F–91405 Orsay, France (F.G.); Université Paris-Sud, UMR 8618 Institut de Biotechnologie des Plantes, F–91405 Orsay, France (G.T., G.N.); CNRS, UMR 320/UMR 8120 Génétique Végétale, F–91190 Gif-sur-Yvette, France (C.D., M.Z.); INRA, UMR 879 Reproduction et Développement des Plantes, F–69364 Lyon, France (P.R.)
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11
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Capelle V, Remoué C, Moreau L, Reyss A, Mahé A, Massonneau A, Falque M, Charcosset A, Thévenot C, Rogowsky P, Coursol S, Prioul JL. QTLs and candidate genes for desiccation and abscisic acid content in maize kernels. BMC Plant Biol 2010; 10:2. [PMID: 20047666 PMCID: PMC2826337 DOI: 10.1186/1471-2229-10-2] [Citation(s) in RCA: 34] [Impact Index Per Article: 2.4] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 08/03/2009] [Accepted: 01/04/2010] [Indexed: 05/17/2023]
Abstract
BACKGROUND Kernel moisture at harvest is an important trait since a low value is required to prevent unexpected early germination and ensure seed preservation. It is also well known that early germination occurs in viviparous mutants, which are impaired in abscisic acid (ABA) biosynthesis. To provide some insight into the genetic determinism of kernel desiccation in maize, quantitative trait loci (QTLs) were detected for traits related to kernel moisture and ABA content in both embryo and endosperm during kernel desiccation. In parallel, the expression and mapping of genes involved in kernel desiccation and ABA biosynthesis, were examined to detect candidate genes. RESULTS The use of an intermated recombinant inbred line population allowed for precise QTL mapping. For 29 traits examined in an unreplicated time course trial of days after pollination, a total of 78 QTLs were detected, 43 being related to kernel desiccation, 15 to kernel weight and 20 to ABA content. Multi QTL models explained 35 to 50% of the phenotypic variation for traits related to water status, indicating a large genetic control amenable to breeding. Ten of the 20 loci controlling ABA content colocated with previously detected QTLs controlling water status and ABA content in water stressed leaves. Mapping of candidate genes associated with kernel desiccation and ABA biosynthesis revealed several colocations between genes with putative functions and QTLs. Parallel investigation via RT-PCR experiments showed that the expression patterns of the ABA-responsive Rab17 and Rab28 genes as well as the late embryogenesis abundant Emb5 and aquaporin genes were related to desiccation rate and parental allele effect. Database searches led to the identification and mapping of two zeaxanthin epoxidase (ZEP) and five novel 9-cis-epoxycarotenoid dioxygenase (NCED) related genes, both gene families being involved in ABA biosynthesis. The expression of these genes appeared independent in the embryo and endosperm and not correlated with ABA content in either tissue. CONCLUSIONS A high resolution QTL map for kernel desiccation and ABA content in embryo and endosperm showed several precise colocations between desiccation and ABA traits. Five new members of the maize NCED gene family and another maize ZEP gene were identified and mapped. Among all the identified candidates, aquaporins and members of the Responsive to ABA gene family appeared better candidates than NCEDs and ZEPs.
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Affiliation(s)
- Valérie Capelle
- Univ Paris-Sud, Institut de Biotechnologie des Plantes, Bât 630, F-91405 Orsay, France
- CNRS, UMR 8618, F-91405 Orsay, France
| | - Carine Remoué
- CNRS, UMR 8618, F-91405 Orsay, France
- CNRS, UMR 0320/UMR 8120 Génétique Végétale, F-91190 Gif-sur-Yvette, France
| | - Laurence Moreau
- INRA, UMR 0320/UMR 8120 Génétique Végétale, F-91190 Gif-sur-Yvette, France
| | - Agnès Reyss
- Univ Paris-Sud, Institut de Biotechnologie des Plantes, Bât 630, F-91405 Orsay, France
- CNRS, UMR 8618, F-91405 Orsay, France
| | - Aline Mahé
- Univ Paris-Sud, Institut de Biotechnologie des Plantes, Bât 630, F-91405 Orsay, France
- CNRS, UMR 8618, F-91405 Orsay, France
| | - Agnès Massonneau
- INRA, Reproduction et Développement des Plantes, UMR 879 INRA-CNRS-ENSL-UCBL, IFR128 Biosciences Lyon-Gerland, F-69364 Lyon Cedex 07, France
- 52, Av de la Marjolaine, 34110 Frontigan, France
| | - Matthieu Falque
- INRA, UMR 0320/UMR 8120 Génétique Végétale, F-91190 Gif-sur-Yvette, France
| | - Alain Charcosset
- INRA, UMR 0320/UMR 8120 Génétique Végétale, F-91190 Gif-sur-Yvette, France
| | - Claudine Thévenot
- Univ Paris-Sud, Institut de Biotechnologie des Plantes, Bât 630, F-91405 Orsay, France
- CNRS, UMR 8618, F-91405 Orsay, France
| | - Peter Rogowsky
- INRA, Reproduction et Développement des Plantes, UMR 879 INRA-CNRS-ENSL-UCBL, IFR128 Biosciences Lyon-Gerland, F-69364 Lyon Cedex 07, France
| | - Sylvie Coursol
- INRA, UMR 0320/UMR 8120 Génétique Végétale, F-91190 Gif-sur-Yvette, France
| | - Jean-Louis Prioul
- Univ Paris-Sud, Institut de Biotechnologie des Plantes, Bât 630, F-91405 Orsay, France
- CNRS, UMR 8618, F-91405 Orsay, France
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12
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Xiong TC, Coursol S, Grat S, Ranjeva R, Mazars C. Sphingolipid metabolites selectively elicit increases in nuclear calcium concentration in cell suspension cultures and in isolated nuclei of tobacco. Cell Calcium 2008; 43:29-37. [PMID: 17570488 DOI: 10.1016/j.ceca.2007.02.005] [Citation(s) in RCA: 27] [Impact Index Per Article: 1.7] [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: 12/20/2006] [Revised: 02/07/2007] [Accepted: 02/13/2007] [Indexed: 11/29/2022]
Abstract
Sphingolipids are known to interfere with calcium-based signalling pathways. Here we report that these compounds modulate nuclear calcium signalling in tobacco BY-2 cells. Nuclear protein kinase activity phosphorylated endogenous sphingoid long-chain bases (LCBs), suggesting that LCBs are actively metabolized in the nucleus of tobacco BY-2 cells. The Delta4-unsaturated LCB D-erythro-sphingosine and the saturated LCB D-ribo-phytosphingosine elicited increases in free calcium in the nucleus in a dose-dependent and structure-related manner. However, neither sphingosine-1-phosphate nor C2-ceramide was able to stimulate nuclear calcium changes. N-,N-Dimethyl-D-erythro-sphingosine, a structural analogue of D-erythro-sphingosine, was the most efficient LCB so far tested in eliciting nuclear calcium changes both in intact tobacco BY-2 cells and in isolated nuclei. TRP channel inhibitors prevent the effect of DMS, suggesting that LCBs may activate TRP-like channels located on the inner nuclear membrane Collectively, the obtained data show that nuclei respond to LCBs on their own independently of the cytosolic compartment.
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Affiliation(s)
- Tou Cheu Xiong
- UMR CNRS/UPS 5546, Surfaces Cellulaires et Signalisation chez les Végétaux, Pôle de Biotechnologie Végétale, 24 Chemin de Borde Rouge, BP 42617 Auzeville, 31326 Castanet-Tolosan, France
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13
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Dowd PE, Coursol S, Skirpan AL, Kao TH, Gilroy S. Petunia phospholipase c1 is involved in pollen tube growth. Plant Cell 2006. [PMID: 16648366 DOI: 10.1105/tpc.106.041582.1] [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: 05/12/2023]
Abstract
Although pollen tube growth is essential for plant fertilization and reproductive success, the regulators of the actin-related growth machinery and the cytosolic Ca2+ gradient thought to determine how these cells elongate remain poorly defined. Phospholipases, their substrates, and their phospholipid turnover products have been proposed as such regulators; however, the relevant phospholipase(s) have not been characterized. Therefore, we cloned cDNA for a pollen-expressed phosphatidylinositol 4,5-bisphosphate (PtdInsP2)-cleaving phospholipase C (PLC) from Petunia inflata, named Pet PLC1. Expressing a catalytically inactive form of Pet PLC1 in pollen tubes caused expansion of the apical Ca2+ gradient, disruption of the organization of the actin cytoskeleton, and delocalization of growth at the tube tip. These phenotypes were suppressed by depolymerizing actin with low concentrations of latrunculin B, suggesting that a critical site of action of Pet PLC1 is in regulating actin structure at the growing tip. A green fluorescent protein (GFP) fusion to Pet PLC1 caused enrichment in regions of the apical plasma membrane not undergoing rapid expansion, whereas a GFP fusion to the PtdInsP2 binding domain of mammalian PLC delta1 caused enrichment in apical regions depleted in PLC. Thus, Pet PLC1 appears to be involved in the machinery that restricts growth to the very apex of the elongating pollen tube, likely through its regulatory action on PtdInsP2 distribution within the cell.
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Affiliation(s)
- Peter E Dowd
- Department of Biochemistry and Molecular Biology, Pensylvania State University, University Park, Pensylvania 16802, USA
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14
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Dowd PE, Coursol S, Skirpan AL, Kao TH, Gilroy S. Petunia phospholipase c1 is involved in pollen tube growth. Plant Cell 2006; 18:1438-53. [PMID: 16648366 PMCID: PMC1475500 DOI: 10.1105/tpc.106.041582] [Citation(s) in RCA: 163] [Impact Index Per Article: 9.1] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Received: 02/01/2006] [Revised: 03/17/2006] [Accepted: 04/05/2006] [Indexed: 05/08/2023]
Abstract
Although pollen tube growth is essential for plant fertilization and reproductive success, the regulators of the actin-related growth machinery and the cytosolic Ca2+ gradient thought to determine how these cells elongate remain poorly defined. Phospholipases, their substrates, and their phospholipid turnover products have been proposed as such regulators; however, the relevant phospholipase(s) have not been characterized. Therefore, we cloned cDNA for a pollen-expressed phosphatidylinositol 4,5-bisphosphate (PtdInsP2)-cleaving phospholipase C (PLC) from Petunia inflata, named Pet PLC1. Expressing a catalytically inactive form of Pet PLC1 in pollen tubes caused expansion of the apical Ca2+ gradient, disruption of the organization of the actin cytoskeleton, and delocalization of growth at the tube tip. These phenotypes were suppressed by depolymerizing actin with low concentrations of latrunculin B, suggesting that a critical site of action of Pet PLC1 is in regulating actin structure at the growing tip. A green fluorescent protein (GFP) fusion to Pet PLC1 caused enrichment in regions of the apical plasma membrane not undergoing rapid expansion, whereas a GFP fusion to the PtdInsP2 binding domain of mammalian PLC delta1 caused enrichment in apical regions depleted in PLC. Thus, Pet PLC1 appears to be involved in the machinery that restricts growth to the very apex of the elongating pollen tube, likely through its regulatory action on PtdInsP2 distribution within the cell.
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Affiliation(s)
- Peter E Dowd
- Department of Biochemistry and Molecular Biology, Pensylvania State University, University Park, Pensylvania 16802, USA
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15
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Coursol S, Le Stunff H, Lynch DV, Gilroy S, Assmann SM, Spiegel S. Arabidopsis sphingosine kinase and the effects of phytosphingosine-1-phosphate on stomatal aperture. Plant Physiol 2005; 137:724-37. [PMID: 15665242 PMCID: PMC1065372 DOI: 10.1104/pp.104.055806] [Citation(s) in RCA: 63] [Impact Index Per Article: 3.3] [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: 10/29/2004] [Revised: 12/08/2004] [Accepted: 12/08/2004] [Indexed: 05/17/2023]
Abstract
Sphingolipids are a major component of membrane lipids and their metabolite sphingosine-1-phosphate (S1P) is a potent lipid mediator in animal cells. Recently, we have shown that the enzyme responsible for S1P production, sphingosine kinase (SphK), is stimulated by the phytohormone abscisic acid in guard cells of Arabidopsis (Arabidopsis thaliana) and that S1P is effective in regulating guard cell turgor. We have now characterized SphK from Arabidopsis leaves. SphK activity was mainly associated with the membrane fraction and phosphorylated predominantly the Delta4-unsaturated long-chain sphingoid bases sphingosine (Sph) and 4,8-sphingadienine, and to a lesser extent, the saturated long-chain sphingoid bases dihydrosphingosine and phytosphingosine (Phyto-Sph). 4-Hydroxy-8-sphingenine, which is a major sphingoid base in complex glycosphingolipids from Arabidopsis leaves, was a relatively poor substrate compared with the corresponding saturated Phyto-Sph. In contrast, mammalian SphK1 efficiently phosphorylated Sph, dihydrosphingosine, and 4,8-sphingadienine, but not the 4-hydroxylated long-chain bases Phyto-Sph and 4-hydroxy-8-sphingenine. Surface dilution kinetic analysis of Arabidopsis SphK with Sph presented in mixed Triton X-100 micelles indicated that SphK associates with the micellar surface and then with the substrate presented on the surface. In addition, measurements of SphK activity under different assay conditions combined with phylogenetic analysis suggest that multiple isoforms of SphK may be expressed in Arabidopsis. Importantly, we found that phytosphingosine-1-phosphate, similar to S1P, regulates stomatal apertures and that its action is impaired in guard cells of Arabidopsis plants harboring T-DNA null mutations in the sole prototypical G-protein alpha-subunit gene, GPA1.
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Affiliation(s)
- Sylvie Coursol
- Department of Biology, Pennsylvania State University, University Park, Pennsylvania 16802-5301, USA.
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Osuna L, Coursol S, Pierre JN, Vidal J. A Ca(2+)-dependent protein kinase with characteristics of protein kinase C in leaves and mesophyll cell protoplasts from Digitaria sanguinalis: possible involvement in the C(4)-phosphoenolpyruvate carboxylase phosphorylation cascade. Biochem Biophys Res Commun 2004; 314:428-33. [PMID: 14733923 DOI: 10.1016/j.bbrc.2003.12.103] [Citation(s) in RCA: 9] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 10/26/2022]
Abstract
In mesophyll cells (MC) of Digitaria sanguinalis, the C(4)-phosphoenolpyruvate carboxylase (C(4)-PEPC) initiating the photosynthetic pathway is controlled by a complex light-dependent phosphorylation process. We showed previously that the transduction cascade involves the phosphoinositide pathway and a Ca(2+)-dependent step, which precedes the upregulation of the PEPC kinase (PEPCk). We have now further characterized the cascade component requiring Ca(2+). A Ca(2+)-dependent protein kinase that shows several characteristics of the conventional type of mammalian protein kinase C (PKC) was detected in protein extracts from mesophyll cell protoplasts (MCPs). It catalyzed the in vitro phosphorylation of the C1-peptide PKC substrate and was markedly inhibited by a PKC-specific pseudosubstrate domain. However, it was only modestly activated by the phospholipids phosphatidylserine and lysophosphatidylcholine, while choline, oleyl acetylglycerol, phosphatidylinositol, and the phorbol ester phorbol 12-myristate 13-acetate did not show any effect. Nevertheless, its activity was found to be associated with a polypeptide of 75kDa that was recognized by a PKC antibody raised against the C-terminus of rabbit PKCbeta II. In addition, this protein kinase was also inhibited by the Ca(2+)-dependent protein kinase (CDPK)/PKC inhibitors W7, H7, and staurosporine. Surprisingly, it was found to be phosphorylated in dark-adapted MCPs, albeit to a low extent, and this did not change during protoplast induction by light. W7, H7, and staurosporine were shown to markedly inhibit C(4)-PEPC phosphorylation in light-treated MCPs. These results support the view that this protein kinase is a good candidate to represent the Ca(2+)-activated component of the C(4)-PEPC phosphorylation cascade.
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Affiliation(s)
- Lidia Osuna
- Laboratorio de Fisiologia Vegetal, Facultad de Biologia, Universidad de Sevilla, Avda., Reina Mercedes, Sevilla, Spain
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17
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Coursol S, Fan LM, Le Stunff H, Spiegel S, Gilroy S, Assmann SM. Sphingolipid signalling in Arabidopsis guard cells involves heterotrimeric G proteins. Nature 2003; 423:651-4. [PMID: 12789341 DOI: 10.1038/nature01643] [Citation(s) in RCA: 235] [Impact Index Per Article: 11.2] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [Key Words] [MESH Headings] [Track Full Text] [Journal Information] [Subscribe] [Scholar Register] [Received: 02/05/2003] [Accepted: 04/07/2003] [Indexed: 11/09/2022]
Abstract
In animals, the sphingolipid metabolite sphingosine-1-phosphate (S1P) functions as both an intracellular messenger and an extracellular ligand for G-protein-coupled receptors of the S1P receptor family, regulating diverse biological processes ranging from cell proliferation to apoptosis. Recently, it was discovered in plants that S1P is a signalling molecule involved in abscisic acid (ABA) regulation of guard cell turgor. Here we report that the enzyme responsible for S1P production, sphingosine kinase (SphK), is activated by ABA in Arabidopsis thaliana, and is involved in both ABA inhibition of stomatal opening and promotion of stomatal closure. Consistent with this observation, inhibition of SphK attenuates ABA regulation of guard cell inward K(+) channels and slow anion channels, which are involved in the regulation of stomatal pore size. Surprisingly, S1P regulates stomatal apertures and guard cell ion channel activities in wild-type plants, but not in knockout lines of the sole prototypical heterotrimeric G-protein alpha-subunit gene, GPA1 (refs 5, 6, 7-8). Our results implicate heterotrimeric G proteins as downstream elements in the S1P signalling pathway that mediates ABA regulation of stomatal function, and suggest that the interplay between S1P and heterotrimeric G proteins represents an evolutionarily conserved signalling mechanism.
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Affiliation(s)
- Sylvie Coursol
- Department of Biology, Pennsylvania State University, 208 Mueller Laboratory, University Park, Pennsylvania 16802-5301, USA
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18
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Coursol S, Pierre JN, Vidal J, Grisvard J. Cloning and characterization of a phospholipase C from the C(4) plant Digitaria sanguinalis. J Exp Bot 2002; 53:1521-1524. [PMID: 12021300] [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: 05/23/2023]
Abstract
As a PLC activity was implicated in the light transduction pathway that controls C(4) photosynthesis in Digitaria sanguinalis, a full length PLC cDNA (DsPLC2) was cloned. The proteins encoded by the two possible open reading frames were produced in Escherichia coli; they both harbour a PLC activity but with different response to Ca(2+) concentration, and with different sensitivity to the PLC inhibitor U-73122.
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Affiliation(s)
- Sylvie Coursol
- Institut de Biotechnologie des Plantes, UMR 8618, Université Paris XI, Bâtiment 630, 91405 Orsay Cedex, France
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Coursol S, Pierre JN, Vidal J. Role of the phosphoinositide pathway in the light-dependent C4 phosphoenolpyruvate carboxylase phosphorylation cascade in Digitaria sanguinalis protoplasts. Biochem Soc Trans 2000; 28:821-3. [PMID: 11171220] [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] [Journal Information] [Subscribe] [Scholar Register] [Indexed: 02/18/2023]
Abstract
Stimulus-response coupling in animal cells frequently involves the hydrolysis of PtdIns(4,5)P(2) which is catalysed by phosphoinositide-specific phospholipase C (PI-PLC). There is an increasing body of evidence for PI-PLC-based signalling in plant cells; however, the physiological role of this system remains poorly documented in plants. Our data provide the first evidence that a PI-PLC-based signalling system is a committed step in the transduction chain controlling the phosphorylation state of C(4) phosphoenolpyruvate carboxylase (PEPC), the regulation of which is central to the assimilation of atmospheric CO(2) in C(4) plants.
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Affiliation(s)
- S Coursol
- Institut de Biotechnologie des Plantes, UMR 8618, Université Paris XI, Bâtiment 630, 91405 Orsay Cedex, France
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Coursol S, Giglioli-Guivarc'h N, Vidal J, Pierre JN. An increase in phosphoinositide-specific phospholipase C activity precedes induction of C4 phosphoenolpyruvate carboxylase phosphorylation in illuminated and NH4Cl-treated protoplasts from Digitaria sanguinalis. Plant J 2000; 23:497-506. [PMID: 10972876 DOI: 10.1046/j.1365-313x.2000.00819.x] [Citation(s) in RCA: 19] [Impact Index Per Article: 0.8] [Reference Citation Analysis] [What about the content of this article? (0)] [Affiliation(s)] [Abstract] [MESH Headings] [Track Full Text] [Subscribe] [Scholar Register] [Indexed: 05/23/2023]
Abstract
A Ca2+-dependent phosphoinositide-specific phospholipase C (PI-PLC) activity has been characterized in the microsomal fraction of Digitaria sanguinalis mesophyll cell protoplasts. Microsomal PI-PLC was found to be inhibited in vitro by a mammalian anti-PLC-delta1 antibody and by the aminosteroide U-73122, an inhibitor of PI-PLC activity in animal cells. In Western blot experiments, the antibody recognized an 85 kDa protein in both microsomal protein extracts from mesophyll protoplasts and rat brain protein extracts containing the authentic enzyme. The involvement of the microsomal PI-PLC in the light-dependent transduction pathway leading to the phosphorylation of C4 phosphoenolpyruvate carboxylase (PEPC) was investigated in D. sanguinalis protoplasts. A transient increase in the PI-PLC reaction product inositol-1,4,5-trisphosphate (Ins(1,4, 5)P3) was observed in situ during early induction of the C4 PEPC phosphorylation cascade. U-73122, but not the inactive analogue U-73343, efficiently blocked the transient accumulation of Ins(1,4, 5)P3, and both the increase in C4 PEPC kinase activity and C4 PEPC phosphorylation in illuminated and weak base-treated protoplasts. Taken together, these data suggest that PI-PLC-based signalling is a committed step in the cascade controlling the regulation of C4 PEPC phosphorylation in C4 leaves.
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Affiliation(s)
- S Coursol
- Institut de Biotechnologie des Plantes, UMR 8618, Université Paris XI, Bâtiment 630, 91405 Orsay Cedex, France
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