Genetic control on wood density and cellulose content of Acacia crassicarpain the first - generation progeny test at Cam Lo - Quang Tri
Keywords:
progeny test, Acacia crassicarpa, heristablity, wood density, cellulose contentAbstract
This research on genetic control on growth, stem straightness, wood density and cellulose content of Acacia crassicarpa was implemented in the first - generation progeny test at Cam Lo, Quang Tri. The results showed that at age of 10 year old, growth traits and stem straightness, wood density and
cellulose content were significant difference between families (Fpr. <0.001), but not significantly between provenances in the Cam Lo test. Narrow - sense heristablities of growth traits and stem straightness were low - medium values (ranged from 0.19 to 0.24). Meanwhile, the heristablities of wood density and cellulose content were higher and ranged Tạp chí KHLN 2014 Phạm Xuân Đỉnhet al., 2014(2) from 0.39 to 0.74. Selection of 10% of the families resulted in gain varying from 2.0 to 5.0% for growth traits and 3.5 - 13.5% for wood density and cellulose content. Because of negative, low and non - significant correlations between growth traits and wood properties (ra
and rp= - 0.04÷ - 0.14), selection of families with high growth traits as well as high wood density and cellulose content could be practically. Our results also improved that two families (numberred 7 and 79) performed highgrowth rate, high wood density and cellulose content. Therefore, they should be deployed in the future commercial plantations. The genotypic and phenotypic correlations between wood density and
cellulose content were high (0.73÷0.89), so using wood density as selection traits would be an indirect trait in improvement of cellulose content of A. crassicarpa. Similarly, strong and significant correlations between wood density in heartwood and sapwood (0.72÷0.90) indicated that juvenile wood
density is a good genetic indicator of this trait in older trees.
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