Genetic variation in wood mechanical properties in ten-year-old Acacia crassicarpa grown in Vietnam

Hai, P. H. and Toan, L. X. and Duong, L. A. (2024) Genetic variation in wood mechanical properties in ten-year-old Acacia crassicarpa grown in Vietnam. Journal of Tropical Forest Science (JTFS) (Malaysia), 36 (2). pp. 205-214. ISSN 0128-1283

Wood mechanical properties of Acacia crassicarpa were assessed at the age of ten years old in a progeny test at Cam Lo, Quang Tri Province, central Vietnam. A total of 208 trees from 52 open-pollinated families were selected for study. Height and diameter at breast height were measured for all selected trees and spiral grain was also measured at breast height on the standing trees using a Chalmers device, which measures the grain angle of the surface wood. Basic density and shrinkage were measured on one 12-mm bark-tobark increment cores taken at breast height from each sampled tree. Microfibril angle was measured on fiber prepared from the core samples using polarized light microscopy. Genetic parameters of the wood and growth traits were estimated using individual-tree linear mixed models. High coefficients of additive genetic variation (CV₂, 17-34%) and high heritabilities (h²= 0.61-0.82) for all wood traits indicated that there is potential to improve basic density, wood shrinkage, grain angle and microfibril angle in the species in central Vietnam. The genetic correlation between DBH and shrinkage was positive and thus unfavourable, whereas correlations between DBH and both spiral grain and microfibril angle were negative and favourable. The Chalmers device appeared to be a reliable indirect method for investigating genetic variation in spiral grain in A. crassicarpa. Index selection, based on genetic parameters and economic weighting dependent on breeding objectives is suggested for development of seed orchards to deliver genetic gain for A. crassicarpa in central Vietnam.

Full text available from: Official URL: https://jtfs.frim.gov.my/jtfs/article/view/2723/19...

Abstract

Wood mechanical properties of Acacia crassicarpa were assessed at the age of ten years old in a progeny test at Cam Lo, Quang Tri Province, central Vietnam. A total of 208 trees from 52 open-pollinated families were selected for study. Height and diameter at breast height were measured for all selected trees and spiral grain was also measured at breast height on the standing trees using a Chalmers device, which measures the grain angle of the surface wood. Basic density and shrinkage were measured on one 12-mm bark-tobark increment cores taken at breast height from each sampled tree. Microfibril angle was measured on fiber prepared from the core samples using polarized light microscopy. Genetic parameters of the wood and growth traits were estimated using individual-tree linear mixed models. High coefficients of additive genetic variation (CV₂, 17-34%) and high heritabilities (h²= 0.61-0.82) for all wood traits indicated that there is potential to improve basic density, wood shrinkage, grain angle and microfibril angle in the species in central Vietnam. The genetic correlation between DBH and shrinkage was positive and thus unfavourable, whereas correlations between DBH and both spiral grain and microfibril angle were negative and favourable. The Chalmers device appeared to be a reliable indirect method for investigating genetic variation in spiral grain in A. crassicarpa. Index selection, based on genetic parameters and economic weighting dependent on breeding objectives is suggested for development of seed orchards to deliver genetic gain for A. crassicarpa in central Vietnam.

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Item Type:	Article
AGROVOC Term:	wood
AGROVOC Term:	Acacia crassicarpa
AGROVOC Term:	selection
AGROVOC Term:	genetic variation
AGROVOC Term:	microscopy
AGROVOC Term:	heritability
AGROVOC Term:	genetic gain
AGROVOC Term:	shrinkage
AGROVOC Term:	progeny testing
AGROVOC Term:	Exopalaemon vietnamicus
Geographical Term:	Vietnam
Depositing User:	Ms. Azariah Hashim
Date Deposited:	02 Mar 2026 02:51
Last Modified:	02 Mar 2026 02:51
URI:	http://webagris.upm.edu.my/id/eprint/3415

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