GROWTH CHARACTERISTICS OF TETRAPLOID F2 ACACIA HYBRIDS IN A CLONAL TRIAL AT BA VI
DOI:
https://doi.org/10.70169/VJFS.1078Keywords:
Diploid, growth, polypoid breeding, tetraploid, F2 acacia hybridAbstract
The study evaluated and compared the growth performance of 41 diploid (2n) and 14 tetraploid (4n) F2 hybrid acacia clones at 4 years of age in Ba Vi. The growth traits assessed included diameter at breast height (D1.3), total tree height (Hvn), stem volume (V), and morphological characteristics such as stem straightness (St) and an overall stem quality index (Icl). The results showed that tetraploid clones exhibited lower growth compared to diploid clones in most parameters (P<0.05): D1.3 (5.74cm vs. 6.53cm), Hvn (7.44m vs. 8.08m), and stem volume (14.06 dm³/tree vs. 17.39 dm³/tree). The average survival rate of tetraploid clones was 56.96%, slightly lower than that of diploid clones (57.32%). However, tetraploid trees had a higher overall stem quality index (3.96 vs. 3.80), and several tetraploid clones demonstrated good growth (P < 0.05), indicating potential for improving planting stock quality through selection of superior tetraploid lines.
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