Agritrop
Home

Plasticity of primary and secondary growth dynamics in Eucalyptus hybrids: A quantitative genetics and QTL mapping perspective

Bartholomé Jérôme, Salmon Frédéric, Vigneron Philippe, Bouvet Jean-Marc, Plomion Christophe, Gion Jean-Marc. 2013. Plasticity of primary and secondary growth dynamics in Eucalyptus hybrids: A quantitative genetics and QTL mapping perspective. BMC Plant Biology, 13 (120), 14 p.

Journal article ; Article de revue à facteur d'impact Revue en libre accès total
[img]
Preview
Published version - Anglais
Use under authorization by the author or CIRAD.
document_571777.pdf

Télécharger (756kB) | Preview

Quartile : Q1, Sujet : PLANT SCIENCES

Abstract : Background: The genetic basis of growth traits has been widely studied in forest trees. Quantitative trait locus (QTL) studies have highlighted the presence of both stable and unstable genomic regions accounting for biomass production with respect to tree age and genetic background, but results remain scarce regarding the interplay between QTLs and the environment. In this study, our main objective was to dissect the genetic architecture of the growth trajectory with emphasis on genotype x environment interaction by measuring primary and secondary growth covering intervals connected with environmental variations. Results: Three different trials with the same family of Eucalyptus urophylla x E. grandis hybrids (with different genotypes) were planted in the Republic of Congo, corresponding to two QTL mapping experiments and one clonal test. Height and radial growths were monitored at regular intervals from the seedling stage to five years old. The correlation between growth increments and an aridity index revealed that growth before two years old (r = 0.5; 0.69) was more responsive to changes in water availability than late growth (r = 0.39; 0.42) for both height and circumference. We found a regular increase in heritability with time for cumulative growth for both height [0.06 - 0.33] and circumference [0.06 - 0.38]. Heritabilities for incremental growth were more heterogeneous over time even if ranges of variation were similar (height [0-0.31]; circumference [0.19 to 0.48]). Within the trials, QTL analysis revealed collocations between primary and secondary growth QTLs as well as between early growth increments and final growth QTLs. Between trials, few common QTLs were detected highlighting a strong environmental effect on the genetic architecture of growth, validated by significant QTL x E interactions. Conclusion: These results suggest that early growth responses to water availability determine the genetic architecture of total growth at the mature stage and highlight the importance of considering growth as a composite trait (such as yields for annual plants) for a better understanding of its genetic bases. (Résumé d'auteur)

Mots-clés Agrovoc : Eucalyptus grandis, Eucalyptus urophylla, Hybride, Héritabilité, Croissance, Locus des caractères quantitatifs, modèle de croissance forestière, Plasticité, Paramètre génétique, Sélection

Mots-clés géographiques Agrovoc : République démocratique du Congo

Classification Agris : K10 - Forestry production
F62 - Plant physiology - Growth and development
F30 - Plant genetics and breeding

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

Auteurs et affiliations

  • Bartholomé Jérôme, CIRAD-BIOS-UMR AGAP (FRA) ORCID: 0000-0002-0855-3828
  • Salmon Frédéric, CIRAD-BIOS-UMR AGAP (GLP)
  • Vigneron Philippe, CIRAD-BIOS-UMR AGAP (COG)
  • Bouvet Jean-Marc, CIRAD-BIOS-UMR AGAP (FRA)
  • Plomion Christophe, INRA (FRA)
  • Gion Jean-Marc, CIRAD-BIOS-UMR AGAP (FRA)

Source : Cirad - Agritrop (https://agritrop.cirad.fr/571777/)

View Item (staff only) View Item (staff only)

[ Page générée et mise en cache le 2020-10-28 ]