Preponderance of additive and non-additive variances for growth, ecophysiological and wood traits in Eucalyptus hybrid genotype-by-spacing interaction
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.
| Main Authors: | , , |
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| Format: | article biblioteca |
| Language: | eng |
| Published: |
Springer
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| Subjects: | F60 - Physiologie et biochimie végétale, F30 - Génétique et amélioration des plantes, |
| Online Access: | http://agritrop.cirad.fr/601264/ http://agritrop.cirad.fr/601264/1/00a0905d-92b1-4686-9ed6-b1b3982a7088.pdf |
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| Summary: | 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. |
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