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Publication Details
AFRICAN RESEARCH NEXUS
SHINING A SPOTLIGHT ON AFRICAN RESEARCH
agricultural and biological sciences
Partial Resistance of medicago truncatula to aphanomyces euteiches is associated with protection of the root stele and is controlled by a major QTL rich in proteasome-related genes
Molecular Plant-Microbe Interactions, Volume 22, No. 9, Year 2009
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Description
A pathosystem between Aphanomyces euteiches, the causal agent of pea root rot disease, and the model legume Medicago truncatula was developed to gain insights into mechanisms involved in resistance to this oomycete. The F83005.5 French accession and the A17-Jemalong reference line, susceptible and partially resistant, respectively, to A. euteiches, were selected for further cytological and genetic analyses. Microscopy analyses of thin root sections revealed that a major difference between the two inoculated lines occurred in the root stele, which remained pathogen free in A17. Striking features were observed in A17 roots only, including i) frequent pericycle cell divisions, ii) lignin deposition around the pericycle, and iii) accumulation of soluble phenolic compounds. Genetic analysis of resistance was performed on an F7 population of 139 recombinant inbred lines and identified a major quantitative trait locus (QTL) near the top of chromosome 3. A second study, with nearisogenic line responses to A. euteiches confirmed the role of this QTL in expression of resistance. Fine-mapping allowed the identification of a 135-kb sequenced genomic DNA region rich in proteasome-related genes. Most of these genes were shown to be induced only in inoculated A17. Novel mechanisms possibly involved in the observed partial resistance are proposed. © 2009 The American Phytopathological Society.
Authors & Co-Authors
Djébali, Naceur
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
France, Paris
Cnrs Centre National de la Recherche Scientifique
Tunisia, Hamam Lif
Centre de Biotechnologie de Borj Cédria
Jauneau, Alain
France, Castanet-tolosan
Ifr40 Cnrs
Carine, Ameline Torregrosa
France, Toulouse
Institut National Polytechnique de Toulouse
Chardon, Fabien
France, Toulouse
Institut National Polytechnique de Toulouse
France, Versailles
Centre de Recherche Île-de-france - Versailles-grignon
Jaulneau, Valérie
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
France, Paris
Cnrs Centre National de la Recherche Scientifique
Mathé, Catherine
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
France, Paris
Cnrs Centre National de la Recherche Scientifique
Bottin, Arnaud
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
France, Paris
Cnrs Centre National de la Recherche Scientifique
Cazaux, Marc
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
France, Paris
Cnrs Centre National de la Recherche Scientifique
Pilet-Nayel, Marie Laure
France, Le Rheu
Centre Inrae Bretagne-normandie
Baranger, Alain
France, Le Rheu
Centre Inrae Bretagne-normandie
Aouani, Mohamed Elarbi
Tunisia, Hamam Lif
Centre de Biotechnologie de Borj Cédria
Egypt, Giza
National Research Centre
Esquerré-Tugayé, Marie Thérèse
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
France, Paris
Cnrs Centre National de la Recherche Scientifique
Dumas, Bernard
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
France, Paris
Cnrs Centre National de la Recherche Scientifique
Huguet, Thierry
France, Castanet-tolosan
Ifr40 Cnrs
Jacquet, Christophe
France, Toulouse
Université Fédérale Toulouse Midi-pyrénées
France, Paris
Cnrs Centre National de la Recherche Scientifique
France, Castanet-tolosan
Laboratoire de Recherche en Sciences Végétales
Statistics
Citations: 85
Authors: 15
Affiliations: 9
Identifiers
Doi:
10.1094/MPMI-22-9-1043
ISSN:
08940282
Research Areas
Genetics And Genomics
Study Design
Cross Sectional Study
Study Approach
Quantitative