Comparisons of genetic parameters and clonal value predictions from clonal trials and seedling base population trials of radiata pine |
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Authors: | Brian S Baltunis Harry X Wu Heidi S Dungey T J “Tim” Mullin Jeremy T Brawner |
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Institution: | (1) CSIRO, Forest Biosciences, P.O. Box E4008, Kingston, 2604, Australian Capital Territory, Australia;(2) Scion, Ensis-Genetics, Private Bag 3020, Rotorua, New Zealand;(3) BioSylve Forest Science NZ Limited, 45 Korokoro Road, Korokoro, Lower Hutt, 5012, New Zealand;(4) CSIRO, Forest Biosciences, P.O. Box 873, Cooroy, 4563, Queensland, Australia |
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Abstract: | Different methods for predicting clonal values were explored for diameter growth (diameter at breast height (DBH)) in a radiata
pine clonal forestry program: (1) clones were analyzed with a full model in which the total genetic variation was partitioned
into additive, dominance, and epistasis (Clone Only—Full Model); (2) clones were analyzed together with seedling base population
data (Clone Plus Seedling (CPS)), and (3) clones were analyzed with a reduced model in which the only genetic term was the
total genetic variance (Clone Only—Reduced Model). DBH was assessed at age 5 for clones and between ages 4 to 13 at the seedling
trials. Significant additive, dominance, and epistatic genetic effects were estimated for DBH using the CPS model. Nonadditive
genetic effects for DBH were 87% as large as additive genetic effects. Narrow-sense ( ) and broad-sense ( ) heritability estimates for DBH using the CPS model were 0.14 ± 0.01 and 0.26 ± 0.01, respectively. Accuracy of predicted
clonal values increased 4% by combining the clone and seedling data over using clonal data alone, resulting in greater confidence
in the predicted genetic performance of clones. Our results indicate that exploiting nonadditive genetic effects in clonal
varieties will generate greater gains than that typically obtainable from conventional family-based forestry of radiata pine.
The predicted genetic gain for DBH from deployment of the top 5% of clones was 24.0%—an improvement of more than 100% over
family forestry at the same selection intensity. We conclude that it is best practice to predict clonal values by incorporating
seedling base population data in the clonal analysis. |
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Keywords: | Clonal forestry Clonal value predictions Radiata pine |
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