Comparative Transcriptomic Analysis of Salt Adaptation in Roots of Contrasting Medicago truncatula Genotypes

Ons Zahaf; Anouck Diet; Mounawer Badri; Ana Zabalza; Esther M.González; Hervé Delacroix; Véronique Gruber; Florian Frugier; Martin Crespi; Sandrine Blanchet; Axel de Zélicourt; Beno(i)t Alunni; Julie Plet; Carole Laffont; Laura de Lorenzo; Sandrine Imbeaud; Jean-Laurent Ichanté

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Comparative Transcriptomic Analysis of Salt Adaptation in Roots of Contrasting Medicago truncatula Genotypes

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Evolutionary diversity can be driven by the interaction of plants with different environments.Molecular bases involved in ecological adaptations to abiotic constraints can be explored using genomic tools.Legumes are major crops worldwide and soil salinity is a main stress affecting yield in these plants.We analyzed in the Medicago truncatula legume the root transcriptome of two genotypes having contrasting responses to salt stress:TN1.11,sampled in a salty Tunisian soil,and the reference Jemalong A17 genotype.TN1.11 plants show increased root growth under salt stress as well as a differential accumulation of sodium ions when compared to A17.Transcriptomic analysis revealed specific gene clusters preferentially regulated by salt in root apices of TN1.11,notably those related to the auxin pathway and to changes in histone variant isoforms.Many genes encoding transcription factors (TFs) were also differentially regulated between the two genotypes in response to salt.Among those selected for functional studies,overexpression in roots of the A17 genotype of the bHLH-type TF most differentially regulated between genotypes improved significantly root growth under salt stress.Despite the global complexity of the differential transcriptional responses,we propose that an increase in this bHLH TF expression may be linked to the adaptation of M.truncatula to saline soil environments.

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《分子植物（英文版）》 |2012年第5期|1068-1081|共14页
作者
Ons Zahaf; Anouck Diet; Mounawer Badri; Ana Zabalza; Esther M.González; Hervé Delacroix; Véronique Gruber; Florian Frugier; Martin Crespi; Sandrine Blanchet; Axel de Zélicourt; Beno(i)t Alunni; Julie Plet; Carole Laffont; Laura de Lorenzo; Sandrine Imbeaud; Jean-Laurent Ichanté;
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Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Université Paris Diderot Paris 7, 75205 Paris Cedex 13, France;

Laboratory of Legumes, Centre of Biotechnology of Borj Cedria, BP 901, 2050 Hammam-Lif, Tunisia;

Departamento de Ciencias del Medio Natural, Universidad Pública de Navarra, 31006 Pamplona, Spain;

Departamento de Ciencias del Medio Natural, Universidad Pública de Navarra, 31006 Pamplona, Spain;

Centre de Génétique Moléculaire(CGM), CNRS, Gif/Orsay DNA Microarray Platform(GODMAP), Université Paris-Sud 11, 91190 Gif-sur-Yvette, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Université Paris Diderot Paris 7, 75205 Paris Cedex 13, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Université Paris Diderot Paris 7, 75205 Paris Cedex 13, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Université Paris Diderot Paris 7, 75205 Paris Cedex 13, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Institut des Sciences du Végétal(ISV), CNRS, 91198 Gif-sur-Yvette, France;

Departamento de Microbiología y Parasitología, Universidad de Sevilla, 41012 Sevilla, Spain;

Centro Nacional de Biotecnología(CNB), CSIC, 28049 Madrid, Spain;

Centre de Génétique Moléculaire(CGM), CNRS, Gif/Orsay DNA Microarray Platform(GODMAP), Université Paris-Sud 11, 91190 Gif-sur-Yvette, France;

Génomique Fonctionnelle des tumeurs solides, INSERM, IUH, Université Paris Descartes, 75010 Paris, France;

Centre de Génétique Moléculaire(CGM), CNRS, Gif/Orsay DNA Microarray Platform(GODMAP), Université Paris-Sud 11, 91190 Gif-sur-Yvette, France;

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Comparative Transcriptomic Analysis of Salt Adaptation in Roots of Contrasting Medicago truncatula Genotypes

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