Library Open Repository

Stiffness and checking of Eucalyptus nitens sawn boards: Genetic variation and potential for genetic improvement

Downloads

Downloads per month over past year

Blackburn, DP and Hamilton, MG and Harwood, CE and Innes, TC and Potts, BM and Williams, DR (2010) Stiffness and checking of Eucalyptus nitens sawn boards: Genetic variation and potential for genetic improvement. Tree Genetics & Genomes, 6 (5). pp. 757-765. ISSN 1614-2942

[img] PDF
Blackburn_et_al_2010_TGG_nitens_sawn_boards.pdf | Request a copy
Full text restricted
Available under University of Tasmania Standard License.

Abstract

A trial was undertaken to assess the extent to which variation in sawn-board quality traits of plantation-grown Eucalyptus nitens is under genetic control and amenable to genetic improvement. Five hundred and sixty trees from 129 families and three central Victorian races were sampled from an open-pollinated progeny trial in Tasmania, Australia. Acoustic wave velocity (AWV) was assessed on standing-trees and sawlogs. Wedges from disks extracted from sawlogs were assessed for basic density and checking. Processed boards from 496 of the trees were assessed for board stiffness (static modulus of elasticity, MOE), and internal and surface checking. Genetic differences among races were significant for AWV and MOE traits. The Southern race had the highest mean values for these traits. Significant additive genetic variation within races was observed in all traits, demonstrating that the quality of plantation-grown E. nitens boards could be improved through breeding. Estimated narrow-sense heritabilities were 0.85 for standing-tree AWV, 0.71 for log AWV, 0.37 for board MOE, and ranged from 0.20 to 0.52 for checking traits. A strongly positive genetic correlation (rg = 1.05) was observed between standing-tree AWV and board MOE, indicating that AWV could be used as a selection trait to improve E. nitens board stiffness. The genetic correlation between basic density and board MOE was also positive (rg = 0.62). However, a significant and adverse genetic correlation (rg = 0.61) was identified between basic density and surface check length. Wood stiffness and checking traits were more-or-less genetically independent, and genetic correlations between surface and internal checking were positive but only moderate (rg = 0.48-0.52).

Item Type: Article
Keywords: Eucalyptus nitens, checking, density, heritability, stiffness, sawn timber
Journal or Publication Title: Tree Genetics & Genomes
Page Range: pp. 757-765
ISSN: 1614-2942
Identification Number - DOI: 10.1007/s11295-010-0289-7
Additional Information: The original publication is available at www.springerlink.com
Date Deposited: 13 Apr 2010 05:26
Last Modified: 18 Nov 2014 04:10
URI: http://eprints.utas.edu.au/id/eprint/9729
Item Statistics: View statistics for this item

Repository Staff Only (login required)

Item Control Page Item Control Page