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A rubber tree's durable resistance to Microcyclus ulei is conferred by a qualitative gene and a major quantitative resistance factor

Le Guen Vincent, Garcia Dominique, Doare Fabien, Mattos Carlos Raimunto Reis, Condina Virgile, Couturier Christophe, Chambon Aurélie, Weber Christelle, Espeout Sandra, Seguin Marc. 2011. A rubber tree's durable resistance to Microcyclus ulei is conferred by a qualitative gene and a major quantitative resistance factor. Tree Genetics and Genomes, 7 (5) : pp. 877-889.

Journal article ; Article de revue à facteur d'impact
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Quartile : Q1, Sujet : FORESTRY / Quartile : Q1, Sujet : HORTICULTURE / Quartile : Q3, Sujet : GENETICS & HEREDITY

Abstract : The components of genetic resistance from the Hevea brasiliensis cultivar MDF 180 against South American Leaf Blight (SALB) caused by Microcyclus ulei were investigated by QTL mapping. MDF 180 has already been described as a cultivar with a high level of partial and long-lasting resistance. The resistance of progeny individuals from a cross between a susceptible cultivar and MDF 180 was assessed both under controlled conditions of inoculation by three M. ulei isolates and under natural infection in a field trial. Genetic maps of the two parents of this progeny were mainly established based on microsatellites and AFLP markers. No resistance QTL were found in the susceptible parent. In the resistant parent, we identified a qualitative gene responsible for the resistance against isolates from French Guiana and a major quantitative resistance factor determining the resistance against isolates from the state of Bahia (Brazil). The qualitative resistance gene was denominated M15md and was located in the linkage group g15. Four minor resistance QTLs were also identified, two of which showed an epistatic interaction with M15md. The durability of the resistance of MDF 180 is discussed in light of these data. (Résumé d'auteur)

Mots-clés Agrovoc : Hevea brasiliensis, Microcyclus ulei

Mots-clés géographiques Agrovoc : Bahia, Languedoc-Roussillon, Guyane française

Classification Agris : F30 - Plant genetics and breeding
H20 - Plant diseases

Champ stratégique Cirad : Axe 1 (2005-2013) - Intensification écologique

Auteurs et affiliations

  • Le Guen Vincent, CIRAD-BIOS-UMR AGAP (FRA)
  • Garcia Dominique, CIRAD-BIOS-UMR AGAP (FRA)
  • Doare Fabien, CIRAD-BIOS-UPR Bioagresseurs (GUF)
  • Mattos Carlos Raimunto Reis, Michelin Brésil (BRA)
  • Condina Virgile, CIRAD-BIOS-UPR Bioagresseurs (GUF)
  • Couturier Christophe, CIRAD-BIOS-UPR Bioagresseurs (GUF)
  • Chambon Aurélie, INRA (FRA)
  • Weber Christelle, Centre Christophe Mérieux (FRA)
  • Espeout Sandra, CIRAD-BIOS-UMR AGAP (FRA)
  • Seguin Marc, CIRAD-BIOS-UMR AGAP (FRA)

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Source : Cirad - Agritrop (https://agritrop.cirad.fr/561476/)

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