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Development of the Poplar-Laccaria bicolor Ectomycorrhiza Modifies Root Auxin Metabolism, Signaling, and Response.

Identifieur interne : 001E24 ( Main/Exploration ); précédent : 001E23; suivant : 001E25

Development of the Poplar-Laccaria bicolor Ectomycorrhiza Modifies Root Auxin Metabolism, Signaling, and Response.

Auteurs : Alice Vayssières [France] ; Ales P N K [France] ; Judith Felten [France] ; Annegret Kohler [France] ; Karin Ljung [France] ; Francis Martin [France] ; Valérie Legué [France]

Source :

RBID : pubmed:26084921

Descripteurs français

English descriptors

Abstract

Root systems of host trees are known to establish ectomycorrhizae (ECM) interactions with rhizospheric fungi. This mutualistic association leads to dramatic developmental modifications in root architecture, with the formation of numerous short and swollen lateral roots ensheathed by a fungal mantle. Knowing that auxin plays a crucial role in root development, we investigated how auxin metabolism, signaling, and response are affected in poplar (Populus spp.)-Laccaria bicolor ECM roots. The plant-fungus interaction leads to the arrest of lateral root growth with simultaneous attenuation of the synthetic auxin response element DR5. Measurement of auxin-related metabolites in the free-living partners revealed that the mycelium of L. bicolor produces high concentrations of the auxin indole-3-acetic acid (IAA). Metabolic profiling showed an accumulation of IAA and changes in the indol-3-pyruvic acid-dependent IAA biosynthesis and IAA conjugation and degradation pathways during ECM formation. The global analysis of auxin response gene expression and the regulation of AUXIN SIGNALING F-BOX PROTEIN5, AUXIN/IAA, and AUXIN RESPONSE FACTOR expression in ECM roots suggested that symbiosis-dependent auxin signaling is activated during the colonization by L. bicolor. Taking all this evidence into account, we propose a model in which auxin signaling plays a crucial role in the modification of root growth during ECM formation.

DOI: 10.1104/pp.114.255620
PubMed: 26084921
PubMed Central: PMC4577371


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<term>Indoleacetic Acids (pharmacology)</term>
<term>Laccaria (drug effects)</term>
<term>Laccaria (physiology)</term>
<term>Metabolome (drug effects)</term>
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<term>Plant Roots (drug effects)</term>
<term>Plant Roots (growth & development)</term>
<term>Plant Roots (metabolism)</term>
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<term>Acides indolacétiques (pharmacologie)</term>
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<term>Laccaria (physiologie)</term>
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<term>Mycorhizes (physiologie)</term>
<term>Métabolome (effets des médicaments et des substances chimiques)</term>
<term>Populus (effets des médicaments et des substances chimiques)</term>
<term>Populus (microbiologie)</term>
<term>Protéines végétales (métabolisme)</term>
<term>Racines de plante (croissance et développement)</term>
<term>Racines de plante (effets des médicaments et des substances chimiques)</term>
<term>Racines de plante (microbiologie)</term>
<term>Racines de plante (métabolisme)</term>
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<term>Mycorrhizae</term>
<term>Plant Roots</term>
<term>Populus</term>
<term>Signal Transduction</term>
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<term>Laccaria</term>
<term>Mycorhizes</term>
<term>Métabolome</term>
<term>Populus</term>
<term>Racines de plante</term>
<term>Régulation de l'expression des gènes végétaux</term>
<term>Transduction du signal</term>
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<term>Plant Roots</term>
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<term>Plant Roots</term>
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<term>Populus</term>
<term>Racines de plante</term>
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<term>Plant Roots</term>
<term>Populus</term>
</keywords>
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<term>Acides indolacétiques</term>
<term>Protéines végétales</term>
<term>Racines de plante</term>
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<div type="abstract" xml:lang="en">Root systems of host trees are known to establish ectomycorrhizae (ECM) interactions with rhizospheric fungi. This mutualistic association leads to dramatic developmental modifications in root architecture, with the formation of numerous short and swollen lateral roots ensheathed by a fungal mantle. Knowing that auxin plays a crucial role in root development, we investigated how auxin metabolism, signaling, and response are affected in poplar (Populus spp.)-Laccaria bicolor ECM roots. The plant-fungus interaction leads to the arrest of lateral root growth with simultaneous attenuation of the synthetic auxin response element DR5. Measurement of auxin-related metabolites in the free-living partners revealed that the mycelium of L. bicolor produces high concentrations of the auxin indole-3-acetic acid (IAA). Metabolic profiling showed an accumulation of IAA and changes in the indol-3-pyruvic acid-dependent IAA biosynthesis and IAA conjugation and degradation pathways during ECM formation. The global analysis of auxin response gene expression and the regulation of AUXIN SIGNALING F-BOX PROTEIN5, AUXIN/IAA, and AUXIN RESPONSE FACTOR expression in ECM roots suggested that symbiosis-dependent auxin signaling is activated during the colonization by L. bicolor. Taking all this evidence into account, we propose a model in which auxin signaling plays a crucial role in the modification of root growth during ECM formation. </div>
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<AbstractText>Root systems of host trees are known to establish ectomycorrhizae (ECM) interactions with rhizospheric fungi. This mutualistic association leads to dramatic developmental modifications in root architecture, with the formation of numerous short and swollen lateral roots ensheathed by a fungal mantle. Knowing that auxin plays a crucial role in root development, we investigated how auxin metabolism, signaling, and response are affected in poplar (Populus spp.)-Laccaria bicolor ECM roots. The plant-fungus interaction leads to the arrest of lateral root growth with simultaneous attenuation of the synthetic auxin response element DR5. Measurement of auxin-related metabolites in the free-living partners revealed that the mycelium of L. bicolor produces high concentrations of the auxin indole-3-acetic acid (IAA). Metabolic profiling showed an accumulation of IAA and changes in the indol-3-pyruvic acid-dependent IAA biosynthesis and IAA conjugation and degradation pathways during ECM formation. The global analysis of auxin response gene expression and the regulation of AUXIN SIGNALING F-BOX PROTEIN5, AUXIN/IAA, and AUXIN RESPONSE FACTOR expression in ECM roots suggested that symbiosis-dependent auxin signaling is activated during the colonization by L. bicolor. Taking all this evidence into account, we propose a model in which auxin signaling plays a crucial role in the modification of root growth during ECM formation. </AbstractText>
<CopyrightInformation>© 2015 American Society of Plant Biologists. All Rights Reserved.</CopyrightInformation>
</Abstract>
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<LastName>Vayssières</LastName>
<ForeName>Alice</ForeName>
<Initials>A</Initials>
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<Affiliation>Institut National de la Recherche Agronomique and Université de Lorraine, Unité Mixte de Recherche Interactions Arbres/Microorganismes 1136, Institut National de la Recherche Agronomique-Nancy, F-54280 Champenoux, France (A.V., J.F., A.K., F.M., V.L.); andUmeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 901 83 Umea, Sweden (A.P., K.L.).</Affiliation>
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<Initials>A</Initials>
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<AffiliationInfo>
<Affiliation>Institut National de la Recherche Agronomique and Université de Lorraine, Unité Mixte de Recherche Interactions Arbres/Microorganismes 1136, Institut National de la Recherche Agronomique-Nancy, F-54280 Champenoux, France (A.V., J.F., A.K., F.M., V.L.); andUmeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 901 83 Umea, Sweden (A.P., K.L.).</Affiliation>
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<ForeName>Annegret</ForeName>
<Initials>A</Initials>
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<AffiliationInfo>
<Affiliation>Institut National de la Recherche Agronomique and Université de Lorraine, Unité Mixte de Recherche Interactions Arbres/Microorganismes 1136, Institut National de la Recherche Agronomique-Nancy, F-54280 Champenoux, France (A.V., J.F., A.K., F.M., V.L.); andUmeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 901 83 Umea, Sweden (A.P., K.L.).</Affiliation>
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<ForeName>Valérie</ForeName>
<Initials>V</Initials>
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<Affiliation>Institut National de la Recherche Agronomique and Université de Lorraine, Unité Mixte de Recherche Interactions Arbres/Microorganismes 1136, Institut National de la Recherche Agronomique-Nancy, F-54280 Champenoux, France (A.V., J.F., A.K., F.M., V.L.); andUmeå Plant Science Centre, Department of Forest Genetics and Plant Physiology, Swedish University of Agricultural Sciences, 901 83 Umea, Sweden (A.P., K.L.) valerie.legue@univ-bpclermont.fr.</Affiliation>
</AffiliationInfo>
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<Year>2015</Year>
<Month>06</Month>
<Day>17</Day>
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<Country>United States</Country>
<MedlineTA>Plant Physiol</MedlineTA>
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