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Genetic improvement of plantation-grown Acacia auriculiformis for sawn timber production

Hai, Phi Hong (2009). Genetic improvement of plantation-grown Acacia auriculiformis for sawn timber production. Diss. (sammanfattning/summary) Uppsala : Sveriges lantbruksuniv., Acta Universitatis Agriculturae Sueciae, 1652-6880 ; 2009:56
ISBN 978-91-576-7403-6
[Doctoral thesis]

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Breeding of Acacia auriculiformis A.Cunn. ex Benth in Vietnam, which commenced in 1996, has focused to date on improving tree growth and stem straightness. Little attention has been paid to important properties of wood such as basic density, shrinkage, bending stiffness and strength, which determine suitability for specific end-use applications. The aim of the studies reported here was to obtain knowledge of genetic factors associated with wood traits and their relationships with growth and tree form, in order to facilitate improvement of A. auriculiformis for sawn timber production. Empirical data were gathered in a progeny test, three clonal tests and three genetic gain tests in four provinces of Vietnam. Genetic parameters for the studied traits were estimated at ages ranging from 3 to 9 years. The results showed that individual within-provenance heritabilities (h2) and clonal repeatabilities (H2) for growth, stem straightness, basic density and shrinkage increased with age, but those for mechanical properties were stable with age. In the progeny test, h2 ranged from 0.36 to 0.39 for growth traits, 0.40-0.61 for density and 0.12–0.31 for stem straightness. In clonal tests, H2 ranged from 0.21 to 0.56 for growth traits, 0.16-0.38 for shrinkage traits, and 0.21-0.57 for mechanical properties. Growth and wood properties had coefficients of additive genetic variation (CVA) and genotypic variation (CVG) ranging from 5-12%. High age-age correlations for most studied traits were found, suggesting that there would be more gain per unit time by selecting trees at 3 to 4 years old than at greater ages. Growth traits showed consistent positive genetic correlations with stem straightness, but non-significant correlations with wood properties, except for a significant negative correlation between diameter and stiffness. Genotype by environment interaction was important for growth and stem straightness in clone trials across southern, central-north and northern Vietnam, but not important for a number of improved and unimproved seedlots compared in genetic gain trials across northern, central-north and central Vietnam. Predicted and realised gains for growth were substantial for seed orchard seedlots produced by the current breeding program, compared with natural-provenance and local commercial control seedlots. Good gains in growth and form traits and wood properties could be obtained from clonal selection, although the absence of strong, favourable correlations between growth and wood properties indicates that gains for individual traits would be reduced if a multi-trait improvement approach was adopted. The findings clearly demonstrate that there is potential to improve tree growth, stem straightness, wood density, shrinkage and mechanical properties of A. auriculiformis in Vietnam.

Authors/Creators:Hai, Phi Hong
Title:Genetic improvement of plantation-grown Acacia auriculiformis for sawn timber production
Series Name/Journal:Acta Universitatis Agriculturae Sueciae
Year of publishing :2009
Number of Pages:54
ALLI. Hai, P.H., Jansson, G., Harwood, C., Hannrup, B. & Thinh, H.H. (2008). Genetic variation in growth, stem straightness and branch thickness in clonal trials of Acacia auriculiformis at three contrasting sites in Vietnam. Forest Ecology and Management 255(1), 156-167. II. Hai, P.H., Jansson, G., Harwood, C., Hannrup, B., Thinh, H.H. & Pinyopusarerk, K. (2008). Genetic variation in wood basic density and knot index and their relationship with growth traits for Acacia auriculiformis A. Cunn ex Benth in Northern Vietnam. New Zealand Journal of Forestry Science 38(1), 176-192. III. Hai, P.H., Jansson, G., Hannrup, B., Harwood, C. & Thinh, H.H. (2009). Use of wood shrinkage characteristics in breeding of fast-grown Acacia auriculiformis A. Cunn. ex Benth in Vietnam. Annals of Forest Science 66 (6), 611p1-611p9. IV. Hai, P.H., Hannrup, B., Harwood, C., Jansson, G. & Ban, D. V. (2009). Wood stiffness and strength as selection traits for sawn timber in Acacia auriculiformis A. Cunn. ex Benth. (Submitted). V. Hai, P.H., Harwood, C., Kha, L.D., Pinyopusarerk, K. & Thinh, H.H. (2008). Genetic gain from breeding Acacia auriculiformis in Vietnam. Journal of Tropical Forest Science 20(4), 313-327.
Place of Publication:Uppsala
ISBN for printed version:978-91-576-7403-6
Publication Type:Doctoral thesis
Full Text Status:Public
Agrovoc terms:acacia auriculiformis, timber trees, wood properties, genotype environment interaction, genetic correlation, genetic gain, heritability, viet nam
Keywords:Acacia auriculiformis, correlated response, genetic correlation, genotype by environment interaction, genetic gain, heritability, sawn timber, wood property
Permanent URL:
ID Code:2074
Department:(NL, NJ) > Dept. of Plant Biology and Forest Genetics (until 131231)
Deposited By: Hai Phi
Deposited On:03 Sep 2009 00:00
Metadata Last Modified:02 Dec 2014 10:16

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