Kien, Nguyen Duc
- Department of Plant Biology, Swedish University of Agricultural Sciences
Kien, Nguyen Duc; Jansson, Christer; Harwood, Chris; Thinh, Ha Huy
Genetic parameters for growth, stem straightness and branch size were estimated ill two open-pollinated progeny trials at two sites ill northern Vietnam. Each trial tested 144 open-pollinated families front 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 ill both trials, also at age 8 years ill one trial, and at ages 7 and 9 years ill 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 FIT it because stable after age two years. Coefficients of additive genetic variation for growth traits ranged From 7.3 to 12.4%. Heritabilities for TR and BRA were from 0.09 to 0.22. Age-age genetic correlations for growth trails 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 years, depending oil the anticipated plantation rotation age.
Provenance; heritability; age-age correlation; genotype by environment interaction; longitudinal data analysis; optimum selection age
Journal of Tropical Forest Science
2009, Volume: 21, number: 1, pages: 50-65
Publisher: FOREST RESEARCH INST MALAYSIA