Infection-specific activation of the Medicago truncatula Enod11 early nodulin gene promoter during actinorhizal root nodulation.
Identifieur interne : 002665 ( Main/Curation ); précédent : 002664; suivant : 002666Infection-specific activation of the Medicago truncatula Enod11 early nodulin gene promoter during actinorhizal root nodulation.
Auteurs : Sergio Svistoonoff [France] ; Mame-Ourèye Sy ; Nathalie Diagne ; David G. Barker ; Didier Bogusz ; Claudine FrancheSource :
- Molecular plant-microbe interactions : MPMI [ 0894-0282 ] ; 2010.
Descripteurs français
- KwdFr :
- Frankia (physiologie), Maladies des plantes (MeSH), Medicago truncatula (génétique), Medicago truncatula (métabolisme), Mycorhizes (physiologie), Nodulation racinaire (génétique), Nodulation racinaire (physiologie), Protéines végétales (génétique), Protéines végétales (métabolisme), Racines de plante (génétique), Racines de plante (métabolisme), Régions promotrices (génétique) (MeSH), Régulation de l'expression des gènes bactériens (MeSH), Régulation de l'expression des gènes végétaux (physiologie).
- MESH :
- génétique : Medicago truncatula, Nodulation racinaire, Protéines végétales, Racines de plante.
- métabolisme : Medicago truncatula, Protéines végétales, Racines de plante.
- physiologie : Frankia, Mycorhizes, Nodulation racinaire, Régulation de l'expression des gènes végétaux.
- Maladies des plantes, Régions promotrices (génétique), Régulation de l'expression des gènes bactériens.
English descriptors
- KwdEn :
- Frankia (physiology), Gene Expression Regulation, Bacterial (MeSH), Gene Expression Regulation, Plant (physiology), Medicago truncatula (genetics), Medicago truncatula (metabolism), Mycorrhizae (physiology), Plant Diseases (MeSH), Plant Proteins (genetics), Plant Proteins (metabolism), Plant Root Nodulation (genetics), Plant Root Nodulation (physiology), Plant Roots (genetics), Plant Roots (metabolism), Promoter Regions, Genetic (MeSH).
- MESH :
- chemical , genetics : Plant Proteins.
- genetics : Medicago truncatula, Plant Root Nodulation, Plant Roots.
- metabolism : Medicago truncatula, Plant Proteins, Plant Roots.
- physiology : Frankia, Gene Expression Regulation, Plant, Mycorrhizae, Plant Root Nodulation.
- Gene Expression Regulation, Bacterial, Plant Diseases, Promoter Regions, Genetic.
Abstract
The MtEnod11 gene from Medicago truncatula is widely used as an early infection-related molecular marker for endosymbiotic associations involving both rhizobia and arbuscular mycorrhizal fungi. In this article, heterologous expression of the MtEnod11 promoter has been studied in two actinorhizal trees, Casuarina glauca and Allocasuarina verticillata. Transgenic C. glauca and A. verticillata expressing a ProMtEnod11::beta-glucuronidase (gus) fusion were generated and the activation of the transgene investigated in the context of the symbiotic associations with the N-fixing actinomycete Frankia and both endo- and ectomycorrhizal fungi (Glomus intraradices and Pisolithus albus, respectively). ProMtEnod11::gus expression was observed in root hairs, prenodules, and nodules and could be correlated with the infection of plant cells by Frankia spp. However, no activation of the gus reporter gene was detected prior to infection or in response to either rhizobial Nod factors or the wasp venom peptide MAS-7. Equally, ProMtEnod11::gus expression was not elicited during the symbiotic associations with either ecto- or endomycorrhizal fungi. These observations suggest that, although there is a conservation of gene regulatory pathways between legumes and actinorhizal plants in cells accommodating endosymbiotic N-fixing bacteria, the events preceding bacterial infection or related to mycorrhization appear to be less conserved.
DOI: 10.1094/MPMI-23-6-0740
PubMed: 20459313
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pubmed:20459313Le document en format XML
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<term>Gene Expression Regulation, Bacterial (MeSH)</term>
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<term>Medicago truncatula (genetics)</term>
<term>Medicago truncatula (metabolism)</term>
<term>Mycorrhizae (physiology)</term>
<term>Plant Diseases (MeSH)</term>
<term>Plant Proteins (genetics)</term>
<term>Plant Proteins (metabolism)</term>
<term>Plant Root Nodulation (genetics)</term>
<term>Plant Root Nodulation (physiology)</term>
<term>Plant Roots (genetics)</term>
<term>Plant Roots (metabolism)</term>
<term>Promoter Regions, Genetic (MeSH)</term>
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<term>Medicago truncatula (génétique)</term>
<term>Medicago truncatula (métabolisme)</term>
<term>Mycorhizes (physiologie)</term>
<term>Nodulation racinaire (génétique)</term>
<term>Nodulation racinaire (physiologie)</term>
<term>Protéines végétales (génétique)</term>
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<term>Racines de plante (génétique)</term>
<term>Racines de plante (métabolisme)</term>
<term>Régions promotrices (génétique) (MeSH)</term>
<term>Régulation de l'expression des gènes bactériens (MeSH)</term>
<term>Régulation de l'expression des gènes végétaux (physiologie)</term>
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<term>Racines de plante</term>
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<term>Régions promotrices (génétique)</term>
<term>Régulation de l'expression des gènes bactériens</term>
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<front><div type="abstract" xml:lang="en">The MtEnod11 gene from Medicago truncatula is widely used as an early infection-related molecular marker for endosymbiotic associations involving both rhizobia and arbuscular mycorrhizal fungi. In this article, heterologous expression of the MtEnod11 promoter has been studied in two actinorhizal trees, Casuarina glauca and Allocasuarina verticillata. Transgenic C. glauca and A. verticillata expressing a ProMtEnod11::beta-glucuronidase (gus) fusion were generated and the activation of the transgene investigated in the context of the symbiotic associations with the N-fixing actinomycete Frankia and both endo- and ectomycorrhizal fungi (Glomus intraradices and Pisolithus albus, respectively). ProMtEnod11::gus expression was observed in root hairs, prenodules, and nodules and could be correlated with the infection of plant cells by Frankia spp. However, no activation of the gus reporter gene was detected prior to infection or in response to either rhizobial Nod factors or the wasp venom peptide MAS-7. Equally, ProMtEnod11::gus expression was not elicited during the symbiotic associations with either ecto- or endomycorrhizal fungi. These observations suggest that, although there is a conservation of gene regulatory pathways between legumes and actinorhizal plants in cells accommodating endosymbiotic N-fixing bacteria, the events preceding bacterial infection or related to mycorrhization appear to be less conserved.</div>
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