Basic density and modulus of elasticity as potential traits in improvement of wood quality of Acacia crassicarpa in Central Vietnam
Keywords:
Genetic variation;, basic density, dynamic modulus of elasticity, Acacia crassicarpaAbstract
200 trees of 50 families were randomly selected from 81 families at the age
of 9 in and Acacia crassicarpa progeny test at Nam Dan (Nghe An) for
evaluating variation and inheritability of wood basic density and dynamic
elastic modulus and then applicating these results to breeding improvement
programs in the North Central. The results showed that there was
significant differences in basic density, but non-significant differences in
modulus of elasticity between both provenances and families. Provenance
of Cape Melville và Luncida (QLD) showed high potential to develop highquality timber plantations. Heritability and coefficient of additive genetic
variation were a very high level for basic density (h
2
= 0.78; CVa = 16.8%),
but low for dynamic modulus of elasticity (h
2
= 0.17; CVa = 8.0%).
Therefore, it could be confirmed that basic density will be a potential trait
to improve, while the dynamic modulus of elasticity will be more difficult
to improve wood quality in the studied species in Central Vietnam. Genetic
correlation between growth traits and wood properties also indicates that
growth traits were independent traits with both basic density and dynamic
modulus of elasticity. Development of seed orchards or clonal seed
orchards as nuclear breeding populations would be suggested to provide
significant benefits in A. crassicarpa breeding.
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