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The effects of drying temperature and method of assessment on the expression of genetic variation in gross shrinkage of Eucalyptus globulus wood samples


Hamilton, MG and Harwood, CE and Potts, BM, The effects of drying temperature and method of assessment on the expression of genetic variation in gross shrinkage of Eucalyptus globulus wood samples, Silvae Genetica, 58, (5-6) pp. 252-261. ISSN 0037-5349 (2009) [Refereed Article]

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Copyright 2009 Silvae Genetica

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DOI: doi:10.1515/sg-2009-0032


Genetic variation in wood-sample gross shrinkage and basic density was examined in a Eucalyptus globulus base population trial growing in Tasmania, Australia. Gross shrinkage, which includes all components of shrinkage including collapse, was assessed in four ways (calliper- and visually-assessed tangential shrinkage, volumetric shrinkage and radial shrinkage) on samples dried at three temperatures (22C, 60C and 105C). Significant differences between subraces were observed using all measures of gross shrinkage for two or more of the three drying treatments. Furthermore, significant additive genetic variation within subraces was observed in calliper- and visually-assessed gross shrinkage under two or more of the drying treatments, with narrow-sense heritabilities greater than or equal to 0.35. There was no obvious trend in heritabilities or coefficients of additive genetic variation with drying temperature. Under the 105C drying treatment, subrace correlations among calliper-, visually- and volume-assessed gross shrinkage were positive and very strong (0.97), while these measures were less strongly correlated with radial gross shrinkage at the subrace level (0.77). Within subrace genetic correlations among the first three measures were also strongly positive (0.95). These high genetic correlations suggest that different drying regimes and the calliper, visual and volume methods of assessment could be used interchangeably to select for reduced tangential gross shrinkage. Estimated subrace and genetic correlations between basic density and measures of gross shrinkage were universally negative (i.e. favourable), although not all were significantly different to zero.

Item Details

Item Type:Refereed Article
Keywords:Heritability, genetic correlation, genotype-by-drying-regime interaction, drying defect, shrinkage, collapse, 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:Hamilton, MG (Dr Matthew Hamilton)
UTAS Author:Potts, BM (Professor Brad Potts)
ID Code:80518
Year Published:2009
Web of Science® Times Cited:3
Deposited By:Plant Science
Deposited On:2012-11-01
Last Modified:2013-05-28

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