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Genetics of wood quality attributes in Western Larch |
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| Authors: | Blaise Ratcliffe Foster J Hart Jaroslav Kláp?tě Barry Jaquish Shawn D Mansfield Yousry A El-Kassaby |
| Institution: | 1. Department of Forest and Conservation Sciences, Faculty of Forestry, The University of British Columbia, Vancouver, BC, V6T 1Z4, Canada 2. Department of Wood Science, Faculty of Forestry, The University of British Columbia, Vancouver, BC, V6T 1Z4, Canada 4. Department of Dendrology and Forest Tree Breeding, Faculty of Forestry and Wood Sciences, Czech University of Life Sciences Prague, Kamycka 129, Praha 6, 165 21, Czech Republic 3. British Columbia Ministry of Forests, Lands and Natural Resource Operations, Tree Improvement Branch, Kalamalka Research Station and Seed Orchard, 3401 Reservoir Road, Vernon, BC, V1B 2C7, Canada |
| Abstract: | ContextWood quality traits are important to balance the negative decline of wood quality associated with selection for growth attributes in gymnosperm breeding programs. Obtaining wood quality estimates quickly is crucial for successful incorporation in breeding programs.AimsThe aims of this paper are to: (1) Estimate genetic and phenotypic correlations between growth and wood quality attributes, (2) Estimate heritability of the studied traits, and (3) Assess the accuracy of in situ non-destructive tools as a representative of actual wood density.MethodsWood density (X-ray densitometry), tree height, diameter, volume, resistance drilling, acoustic velocity, and dynamic modulus of elasticity were estimated, along with their genetic parameters, for 1,200, 20-year-old trees from 25 open-pollinated families.ResultsIndividual tree level heritabilities for non-destructive evaluation attributes were moderate ( $ {\widehat{h}}_i^2=0.37-0.42 $ ), wood density and growth traits were lower ( $ {\widehat{h}}_i^2=0.23-0.35 $ ). Favorable genetic and phenotypic correlations between growth traits, wood density, and non-destructive evaluation traits were observed. A perfect genetic correlation was found between resistance drilling and wood density (r G ?=?1.00?±?0.07), while acoustic velocity and dynamic modulus of elasticity showed weaker genetic correlations with wood density (r G ?=?0.25?±?0.24;?0.46?±?0.21, respectively).ConclusionThis study confirmed that resistance drilling is a reliable predictor of wood density in western larch, while the weak genetic correlations displayed by acoustic velocity and dynamic modulus of elasticity suggest limited dependability for their use as fast in situ wood density assessment methods in this species. |
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