Genetics & Provenances
Isozyme studies revealed marked genetic variation in A.auriculiformis. Three distinct groups of populations corresponding to the geographic distribution in Papua NewGuinea, Queensland and Northern Territory (Wickneswari and Norwati 1991). These regional groupings are also apparent in seedling morphology (Pinyopusarerk et al. 1991). Additionally, field trials have shown marked differences in growth and form. Provenances from Papua New Guinea have the highest production while those from Queensland have a high proportion of single stems. Those from the Northern Territory are inferior in both growth and form (Harwood et al. 1991).
Research Needs
Selection and breeding for superior growth and stem form are now underway in many countries, including Thailand and Vietnam. Natural hybrids of A. auriculiformis x A. mangium have shown desirable characteristics; e.g. vigor, fine branching and tendency for a strong apical dominance. These characteristics lead to healthy trees with single stems and a good clear bole. Production and vegetative propagation of these hybrids warrant detailed study. (Acacia auriculiformis - a multipurpose tropical wattle)