Preponderance of additive and non-additive variances for growth, ecophysiological and wood traits in Eucalyptus hybrid genotype-by-spacing interaction

Makouanzi Ekomono Garel Chrissy, Rambolarimanana Tahina, Bouvet Jean-Marc. 2022. Preponderance of additive and non-additive variances for growth, ecophysiological and wood traits in Eucalyptus hybrid genotype-by-spacing interaction. Tree Genetics and Genomes, 18:32, 12 p.

Résumé : The objective of this study was to better understand the underlying gene action in eucalyptus, under different plantation densities, for a different set of traits: growth, bark thickness, ecophysiological, and wood chemical property traits. We estimated the magnitude and relative proportion of the various genetic variance components using a eucalyptus genotype by spacing (G × S) interaction experiment. A clonally replicated progeny test including 888 clones belonging to 64 full-sib families of Eucalyptus urophylla × Eucalyptus grandis hybrid was used to estimate genetic parameters using genomic information to assess relationship matrix. Two densities (833 and 2500 trees/ha) were used representing contrasted environments in terms of individual tree available resource. Results showed that for height and circumference, additive-by-spacing (A × S) interaction variance increased from 18 to 55 months old, while dominance-by-spacing (D × S) interaction variance decreased. For bark thickness, specific leaf area, nitrogen, calcium, and magnesium, A × S interaction variance was preponderant. For wood chemical properties, except with Klason lignin, genetic additive effects strongly interacted with spacing compared to non-additive effects.

Mots-clés libres : Genetic variance, Genotype by spacing interaction, Ecophysiological trait, Wood traits, Growth traits

Classification Agris : F60 - Physiologie et biochimie végétale
F30 - Génétique et amélioration des plantes

Champ stratégique Cirad : CTS 2 (2019-) - Transitions agroécologiques

Auteurs et affiliations

• Makouanzi Ekomono Garel Chrissy, UMNG (COG) - auteur correspondant
• Rambolarimanana Tahina
• Bouvet Jean-Marc, CIRAD-DGDRS (MDG)

Source : Cirad-Agritrop (https://agritrop.cirad.fr/601264/)

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