Image: article cover, from Prastyono and Susanto (2015), Jurnal Wasian, licensed CC BY-NC 4.0.
A research team from the Forest Biotechnology and Tree Improvement Research Centre evaluated the growth of ulin (Eusideroxylon zwageri T. et B.) in a progeny test in Bondowoso, East Java, at 5.5 years of age. The study, published in Jurnal Wasian, involved 49 families from three provenances: Batanghari, Berau and Kutai Kertanegara. The results show that families from the Batanghari provenance had the best stem diameter and height growth compared with the other provenances.
The study recorded significant differences in height among families within a provenance, but stem diameter did not differ significantly either among provenances or among families. Non-genetic or environmental factors had a considerable influence on ulin growth up to 5.5 years, as indicated by the large residual variance component. Individual heritability for height was high (0.37), while that for stem diameter was moderate (0.26). The genetic correlation between stem diameter and height was strong (0.95).
This information is important for future ulin breeding programmes. By identifying the best-growing families and the extent of genetic control over height, breeders can select more appropriate planting material to produce high-quality ulin. Ulin is known as a high-value hardwood widely used by communities, so genetic improvement is expected to support forest management and its cultivation.
Source and how to cite
This story is based on the research article Variation in Growth Traits of Ironwood (Eusideroxylon zwageri T. ET B.) Progeny Trial in Bondowoso by Prastyono Prastyono and Mudji Susanto Susanto, published in Jurnal Wasian Vol. 2 No. 2 (2015). The full article is free to read on the Jurnal Wasian website.
Cite the original article (APA 7):
Prastyono, P., & Susanto, M. S. (2015). Variation in Growth Traits of Ironwood (Eusideroxylon zwageri T. ET B.) Progeny Trial in Bondowoso. Jurnal Wasian, 2(2), 79–86. https://doi.org/10.62142/64rkka15
If you use these findings in coursework, a thesis or other writing, cite the original article above, not this news story. The original article is licensed CC BY-NC 4.0.
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