GENETIC VARIATION, STEM STRAIGHTNESS AND BRACH THICKNESS OF ACACIA AURICULIFORMIS IN PROGENY TRIAL IN DONG PHU, BINH PHUOC

Abstract

Acacia auriculiformis species are widely planted for commercial plantations and have potential for saw-log production in Vietnam. The aim of the study was to select Acacia auriculiformis varieties with fast gr owth and good stem quality for saw-log plantations in the Southern region. The experiment was tested 79 selected families Acacia auricuiformis and 01 clonal (AA1). The results showed that there were significant differences in growth parameters (diameter and height) at aged four years, average stem volume, stem quality. Based on the results, the five slected families were 29; 4; 5; 49 và 57, with yields ranging from 20.4 to 23.5 m³/ha/year and 68.2% to 47.8% higher than the trial’s average. The quality sum index five families as 3,7 points were higher the trial’s average 3.6 points. The growths traits displayed moderately heritability h² = 0.42 of D_1.3 and h² = 0.38 of H_vn and coefficent of additive genetic variation CV_A = 13.83 of D_1.3 and CV_A = 11.06% of H_vn higher compared to stem quality h² = 0.09 of Dtt và h² = 0.01 of Dnc; with CV_A = 5.05% of Dtt and CV_A = 0.01% of Dnc. Predicted genetic gain of 18.52% about D_1.3 and 14.11% of H_vn if 5% best trees had been selected in the progeny trial at 4 age. The evaluation result about growths, D_1.3, H_vn, Dtt and Dnc are 5 families has promising select for subsequent breed selection studies.