AN OPTIMUM DESIGN FOR SEEDLING SEED ORCHARDS TO MAXIMIZE GENETIC GAIN: AN INVESTIGATION ON SEEDLING SEED ORCHARDS OF Eucalyptus pellita F. Muell
| Main Authors: | Leksono Budi, Kurinobu Susumu, Ide Yuji |
|---|---|
| Format: | Article eJournal |
| Bahasa: | eng |
| Terbitan: |
, 2009
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| Subjects: | |
| Online Access: |
https://zenodo.org/record/1067321 |
Daftar Isi:
- The optimum design of seedling seed orchards in order to maximize genetic gain was investigated. Variance components were estimated on the basis of heigts of individual plants in the first-generation seed orchards of Encaliptus pelita with ages of 1 to 5 years old. The seed orchards were established at two locations in Indonesia - South Kalimantan and South Sumatra. There were three types of variance components,comprising family variance ,plot error variance, and within plot variance was derived using family variance as a percentage. A linear regression equation within plot variance was derived using family variance as an independent variable. The regression equation was statistically significant and could be used to determine relative size of the three variance under different levels of heritability. The optimum number of families of the intermediate heritability (= 0.20) were found to be around 40 to 50, with six to eight tress per plot for a seed orchard of 2 ha with 10 replicates. This result suggested that the design of the first-generation seedling seed orchards was close to the optimum to achieve maximum genetic gain throught the two stages of selections, i.e. within plot selection and family selection.