Genetic control of growth and form in Eucalyptus urophylla in northern Vietnam

Kien N. D., . and Jansson G., . and Harwood C., . and Thinh H. H., . Genetic control of growth and form in Eucalyptus urophylla in northern Vietnam. pp. 50-65. ISSN 0128-1283

Genetic parameters for growth stem straightness and branch size were estimated in two open-pollinated progeny trials of Eucalyptus urophylla at two sites in northern Vietnam. Each trial tested 144 open-pollinated families from nine natural provenances with 134 of these families being common to both trials. Height (HT) and diameter at breast height (DBH) were measured at ages 1 2 3 and 5 years in both trials also at age 8 years in one trial and at ages 7 and 9 years in the other trial. Stem straightness (STR) and branch size (BRA) were assessed at age 5 years and at the final measurement. At age 5 years the Lewotobi provenance displayed the fastest growth with only minor differences among other provenances. Growth traits had within-provenance narrow-sense heritabilities ranging from 0.10 to 0.31. Heritability for DBH increased with age but for HT it became stable after age two years. Coefficients of additive genetic variation for growth traits ranged from 7.3 to 12.4. Heritabilities for STR and BRA were from 0.09 to 0.22. Ageage genetic correlations for growth traits between earlier and later measurements increased with age from 0.27 to 0.97. The genetic correlations between growth (DBH HT) and form (STR BRA) were weak to moderate. Genetic correlations between sites for DBH and HT increased with age and became stable after age 3 years. Optimum selection efficiency for growth traits was reached at age 2 or 3 years depending on the anticipated plantation rotation age.

Full text available from: Official URL: http://www.frim.gov.my/v1/JTFSOnline/jtfs/v21n1/50...

Abstract

Genetic parameters for growth stem straightness and branch size were estimated in two open-pollinated progeny trials of Eucalyptus urophylla at two sites in northern Vietnam. Each trial tested 144 open-pollinated families from nine natural provenances with 134 of these families being common to both trials. Height (HT) and diameter at breast height (DBH) were measured at ages 1 2 3 and 5 years in both trials also at age 8 years in one trial and at ages 7 and 9 years in the other trial. Stem straightness (STR) and branch size (BRA) were assessed at age 5 years and at the final measurement. At age 5 years the Lewotobi provenance displayed the fastest growth with only minor differences among other provenances. Growth traits had within-provenance narrow-sense heritabilities ranging from 0.10 to 0.31. Heritability for DBH increased with age but for HT it became stable after age two years. Coefficients of additive genetic variation for growth traits ranged from 7.3 to 12.4. Heritabilities for STR and BRA were from 0.09 to 0.22. Ageage genetic correlations for growth traits between earlier and later measurements increased with age from 0.27 to 0.97. The genetic correlations between growth (DBH HT) and form (STR BRA) were weak to moderate. Genetic correlations between sites for DBH and HT increased with age and became stable after age 3 years. Optimum selection efficiency for growth traits was reached at age 2 or 3 years depending on the anticipated plantation rotation age.

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Item Type:	Article
AGROVOC Term:	Genetic control
AGROVOC Term:	Eucalyptus urophylla
AGROVOC Term:	Progeny testing
AGROVOC Term:	Eucalyptus urophylla
AGROVOC Term:	Provenance
AGROVOC Term:	Heritability
AGROVOC Term:	Genotype environment interaction
AGROVOC Term:	Genetic correlation
AGROVOC Term:	Natural forests
AGROVOC Term:	Growth rate
Depositing User:	Ms. Suzila Mohamad Kasim
Last Modified:	24 Apr 2025 06:27
URI:	http://webagris.upm.edu.my/id/eprint/21662

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