Realized genetic gain of improved seed sources of Acacia mangium compare to natural provenances and commercial seed sources in North and South Central Vietnam
Keywords:
Acacia mangium, genetic gain trial, natural provenances, plantation-converted seed production areas, seed orchardAbstract
Objectives of the study were to evaluate genetic gain in growth rate of seedlots derived from clonal seed orchards, seedling seed orchards, seed production areas in comparison with seed from natural provenances and commercial seedlots. The study was performed in two genetic gain trials of Acacia mangium at North Central (Dong Ha, Quang Tri) and South Central (Quy Nhon, Binh Dinh) planted in 2014 which include 8 different Acacia mangium seed sources collected from seed orchard, seed production area, best natural provenances and commercial seedlot. At age of 30 - 32 months, the high survival (from 81.5 to 95.5%) and significant difference in growth rate between seed sources were observed in both sites. Although growth rate was different between the two sites, stem volume ranking of seed sources was similar between sites. The seed collected from Bau Bang clonal seed orchard and Ba Vi seedling seed orchard were the best performers (17 - 22 m3 /ha/year), followed by natural provenances from Papua New Guinea (10 - 16 m3 /ha/year). Seed from plantation-converted seed production areas at Long Thanh and Ham Yen, and commercial seedlots were worst at both sites (6.7 - 7.5 m3 /ha/year). Results from this study showed high benefit of using improved seed from well established seed orchards in commercial plantations.
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