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

Content Provider	Springer Nature Link
Author	Blackburn, David Hamilton, Matthew Harwood, Chris Innes, Trevor Potts, Brad Williams, Dean
Copyright Year	2010
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 (r $_{g}$ = 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 (r $_{g}$ = 0.62). However, a significant and adverse genetic correlation (r $_{g}$ = 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 (r $_{g}$ = 0.48–0.52).
Starting Page	757
Ending Page	765
Page Count	9
File Format	PDF
ISSN	16142942
Journal	Tree Genetics & Genomes
Volume Number	6
Issue Number	5
e-ISSN	16142950
Language	English
Publisher	Springer-Verlag
Publisher Date	2010-05-13
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Eucalyptus nitens Checking Density Heritability Stiffness Sawn timber Biotechnology Tree Biology Plant Breeding/Biotechnology Plant Genetics & Genomics Forestry
Content Type	Text
Resource Type	Article
Subject	Genetics Molecular Biology Horticulture Forestry

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