Comprehensive genetic dissection of wood properties in a widely-grown tropical tree: Eucalyptus

Gion Jean-Marc, Carouché Audrey, Deweer Sylvie, Bedon Franck, Pichavant Frédérique, Charpentier Jean-Paul, Baillères Henri, Rozenberg Philippe, Carocha Victor, Ognouabi Nina, Verhaegen Daniel, Grima Pettenati Jacqueline, Vigneron Philippe, Plomion Christophe. 2011. Comprehensive genetic dissection of wood properties in a widely-grown tropical tree: Eucalyptus. BMC Genomics, 12 (5), 19 p.

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Abstract : Background: Eucalyptus is an important genus in industrial plantations throughout the world and is grown for use as timber, pulp, paper and charcoal. Several breeding programmes have been launched worldwide to concomitantly improve growth performance and wood properties (WPs). In this study, an interspecific cross between Eucalyptus urophylla and E. grandis was used to identify major genomic regions (Quantitative Trait Loci, QTL) controlling the variability of WPs. Results: Linkage maps were generated for both parent species. A total of 117 QTLs were detected for a series of wood and end-use related traits, including chemical, technological, physical, mechanical and anatomical properties. The QTLs were mainly clustered into five linkage groups. In terms of distribution of QTL effects, our result agrees with the typical L-shape reported in most QTL studies, i.e. most WP QTLs had limited effects and only a few (13) had major effects (phenotypic variance explained > 15%). The co-locations of QTLs for different WPs as well as QTLs and candidate genes are discussed in terms of phenotypic correlations between traits, and of the function of the candidate genes. The major wood property QTL harbours a gene encoding a Cinnamoyl CoA reductase (CCR), a structural enzyme of the monolignol-specific biosynthesis pathway. Conclusions: Given the number of traits analysed, this study provides a comprehensive understanding of the genetic architecture of wood properties in this Eucalyptus full-sib pedigree. At the dawn of Eucalyptus genome sequence, it will provide a framework to identify the nature of genes underlying these important quantitative traits. (Résumé d'auteur)

Mots-clés Agrovoc : Bois, Eucalyptus urophylla, Eucalyptus grandis, Hybride, Eucalyptus, Bois tropical

Classification Agris : F30 - Plant genetics and breeding
F60 - Plant physiology and biochemistry
K50 - Processing of forest products

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

Auteurs et affiliations

  • Gion Jean-Marc, CIRAD-BIOS-UMR AGAP (FRA)
  • Carouché Audrey
  • Deweer Sylvie
  • Bedon Franck
  • Pichavant Frédérique, Institut du pin (FRA)
  • Charpentier Jean-Paul, INRA (FRA)
  • Baillères Henri, CIRAD-PERSYST-UPR Bois tropicaux (AUS)
  • Rozenberg Philippe, INRA (FRA)
  • Carocha Victor, Forestry and Paper Research Institute (PRT)
  • Ognouabi Nina, CRDPI (COG)
  • Verhaegen Daniel, CIRAD-BIOS-UMR AGAP (FRA)
  • Grima Pettenati Jacqueline, CNRS (FRA)
  • Vigneron Philippe, CIRAD-BIOS-UMR AGAP (COG)
  • Plomion Christophe, INRA (FRA)

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