Study of early selection in tree breeding: 3. A case study using early information to enhance selection efficiency in late trait in lodgepole pine (Pinus contorta spp. Latifolia)

Study of early selection in tree breeding: 3. A case study using early information to enhance selection efficiency in late trait in lodgepole pine (Pinus contorta spp. Latifolia). Wu, H., Yeh, F., Pharis, R., Dhir, N., & Dancik, B. Silvae Genetica, 49:152–158, January, 2000.
abstract bibtex

We present a selection procedure that combines early performance from retrospective study and late performance from field testing into an index designed for enhancing the selection efficiency of the late performance. The prerequisite is that early performance from retrospective study and late performance from field testing must correlate genetically. This selection index procedure is particularly applicable when practical considerations make seedling selection of early traits preferable. An example is the study of biomass partitioning where young trees could offer a solution for large scale evaluation and serve as a useful first approximation to what might be expected in older trees. To numerically illustrate this selection procedure, we present a case study of retrospective early selection in 110 open-pollinated families from Alberta lodgepole pine (Pinus contorta spp. latifolia). Twenty-eight glasshouse traits in seedlings and the 9-year tree height of their siblings on four sites were conceived as the early and late traits, respectively. Five greenhouse traits having highest genetic correlations with overall field performance were selected and indices of one and two traits from these five glasshouse traits with 9-year tree height averaged 3.0% and 6% more efficient, respectively, relative to selection based on 9-year tree height alone. 24 seedling traits which had highest correlations with the field site height were selected for combination with 9-year tree height of one site. Their efficiencies, relative to selection based on 9-year tree height alone, for indices of one and two of glasshouse traits averaged 40% and 55% greater, respectively, than selection based on 9-year tree height alone. This demonstrates the potential of early retrospective genetic study to enhance later mature selection.

@article{wu_study_2000,
	title = {Study of early selection in tree breeding: 3. {A} case study using early information to enhance selection efficiency in late trait in lodgepole pine ({Pinus} contorta spp. {Latifolia})},
	volume = {49},
	shorttitle = {Study of early selection in tree breeding},
	abstract = {We present a selection procedure that combines early performance from retrospective study and late performance from field testing into an index designed for enhancing the selection efficiency of the late performance. The prerequisite is that early performance from retrospective study and late performance from field testing must correlate genetically. This selection index procedure is particularly applicable when practical considerations make seedling selection of early traits preferable. An example is the study of biomass partitioning where young trees could offer a solution for large scale evaluation and serve as a useful first approximation to what might be expected in older trees. To numerically illustrate this selection procedure, we present a case study of retrospective early selection in 110 open-pollinated families from Alberta lodgepole pine (Pinus contorta spp. latifolia). Twenty-eight glasshouse traits in seedlings and the 9-year tree height of their siblings on four sites were conceived as the early and late traits, respectively. Five greenhouse traits having highest genetic correlations with overall field performance were selected and indices of one and two traits from these five glasshouse traits with 9-year tree height averaged 3.0\% and 6\% more efficient, respectively, relative to selection based on 9-year tree height alone. 24 seedling traits which had highest correlations with the field site height were selected for combination with 9-year tree height of one site. Their efficiencies, relative to selection based on 9-year tree height alone, for indices of one and two of glasshouse traits averaged 40\% and 55\% greater, respectively, than selection based on 9-year tree height alone. This demonstrates the potential of early retrospective genetic study to enhance later mature selection.},
	journal = {Silvae Genetica},
	author = {Wu, H.X. and Yeh, Francis and Pharis, R.P. and Dhir, N. and Dancik, Bruce},
	month = jan,
	year = {2000},
	keywords = {⛔ No DOI found},
	pages = {152--158},
}

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This selection index procedure is particularly applicable when practical considerations make seedling selection of early traits preferable. An example is the study of biomass partitioning where young trees could offer a solution for large scale evaluation and serve as a useful first approximation to what might be expected in older trees. To numerically illustrate this selection procedure, we present a case study of retrospective early selection in 110 open-pollinated families from Alberta lodgepole pine (Pinus contorta spp. latifolia). Twenty-eight glasshouse traits in seedlings and the 9-year tree height of their siblings on four sites were conceived as the early and late traits, respectively. 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