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Genetic variation of microfibril angle and its relationship with solid wood and pulpwood traits in two progeny trials of Eucalyptus nitens in Tasmania


Rocha-Sepulveda, MF and Williams, D and Vega, M and Harrison, PA and Vaillancourt, RE and Potts, BM, Genetic variation of microfibril angle and its relationship with solid wood and pulpwood traits in two progeny trials of Eucalyptus nitens in Tasmania, Holzforschung, 75, (8) pp. 689-701. ISSN 0018-3830 (2021) [Refereed Article]

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Available from 08 January 2022

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2020 Walter de Gruyter GmbH, Berlin/Boston

DOI: doi:10.1515/hf-2020-0196


Microfibril angle (MFA) is a key biological trait contributing to wood stiffness, which is a common breeding objective for solid wood products in many tree species. To explore its genetic architecture, area-weighted MFA was measured in two Eucalyptus nitens progeny trials in Tasmania, Australia, with common open-pollinated families. Radial strips were extracted from 823 trees in 131 families and MFA assessed using SilviScan-2. Heritability, genotype-by-environment interaction and inter-trait genetic correlations were evaluated to examine the genetic variability and stability of MFA and its relationships with other solid wood and pulpwood selection traits. Significant family variation was found for MFA in both trials. There was no significant genotype-by-environment interaction and the across site narrow-sense heritability was 0.27. MFA was genetically independent of basic density, growth, and tree form. However, MFA was strongly and favourable genetically correlated to acoustic wave velocity in standing trees, modulus of elasticity and kraft pulp yield (KPY). The present study has shown that genetic improvement of E. nitens for pulpwood selection traits is unlikely to have adversely affected MFA, and thus timber stiffness. Rather these results suggest the possibility that selection for increased KPY may have indirectly improved MFA favourably for solid wood products.

Item Details

Item Type:Refereed Article
Keywords:acoustic wave velocity, cellulose microfibril angle, Eucalyptus nitens, kraft pulp yield, modulus of elasticity, wood basic density
Research Division:Agricultural, Veterinary and Food Sciences
Research Group:Forestry sciences
Research Field:Tree improvement (incl. selection and breeding)
Objective Division:Plant Production and Plant Primary Products
Objective Group:Forestry
Objective Field:Hardwood plantations
UTAS Author:Rocha-Sepulveda, MF (Mr Manuel Rocha Sepulveda)
UTAS Author:Vega, M (Dr Mario Vega Rivero)
UTAS Author:Harrison, PA (Dr Peter Harrison)
UTAS Author:Vaillancourt, RE (Professor Rene Vaillancourt)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:145968
Year Published:2021
Funding Support:Australian Research Council (IC150100004)
Deposited By:Plant Science
Deposited On:2021-08-14
Last Modified:2021-09-02

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