Optimum age for selection based on a time trend of genetic parameters related to diameter growth in seedling seed orchards of Eucalyptus pellita in Indonesia |
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| Authors: | Budi Leksono Susumu Kurinobu Yuji Ide |
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| Institution: | (1) Laboratory of Forest Ecosystem Studies, Department of Ecosystem Studies, Graduate School of Agricultural and Life Sciences, The University of Tokyo, 1-1-1Yayoi, Bunkyo-ku, Tokyo 113-8657, Japan;(2) Forest Tree Breeding Center, Hitachi, Japan |
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| Abstract: | The time trend of genetic parameters related to diameter growth was investigated using data at ages from 1 to 6 years to determine
the optimum age for selection in four seedling seed orchards of Eucalyptus pellita in South Kalimantan and Riau (Sumatra), Indonesia. The seed orchards at each location were from three geographically distinct
provenances from Papua New Guinea. The pooled sum of squares and sum of cross products derived from an analysis of variance
of growth of the three provenance populations were used to estimate genetic parameters at each location. Because the genetic
parameters at rotation age, 8 years in this study, were not available, they were estimated using functions derived from their
time trends. Phenotypic variances and genetic variances calculated at each age were converted to the corresponding square
roots, and then analyzed by the linear regression using means as independent variables. The trend of juvenile–mature correlation
was fitted by a modified Richards function with the ratio of the older diameter mean to the juvenile diameter as an independent
variable. Early selection always resulted in more genetic gain per year than selection at rotation age, and the optimum age
for selection, where genetic gain per year was maximized, was found to be 4 and 5 years in the two locations. |
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| Keywords: | Eucalyptus pellita Genetic gain Heritability Juvenile– mature correlation Optimum selection age |
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