Effect of Selfing on Various Economic Traits in Pinus radiata and Some Implications for Breeding Strategy
Abstract:Selfed and outcrossed progenies of 41 Pinus radiata plus trees were obtained from two separate studies to evaluate the effect of inbreeding on economic traits such as diameter, bole straightness, branching, wood density, and Dothistroma infection at the selection age and at the harvest age. The possibility of using selfed families for estimation of genetic parameters and future breeding was investigated. For diameter, inbreeding depression (ID) varied between 13 and 17% at different ages across different sites. An ID of about 13% and −3.0% was obtained for straightness and wood density, respectively. For Dothistroma, the pattern of ID at different ages was not consistent across different environments. There was generally a close agreement, for all traits except diameter, between estimates of narrow-sense heritability obtained from selfed and outcrossed progenies. Estimated correlations between predicted breeding values at different ages were higher for selfed families compared to outcrossed families, indicating that early selection would be more effective among selfed families than among outcrossed families. For all traits except diameter growth, ranking of parents on selfed performance was highly correlated with outcrossed performance at the selection age. This study showed that selection on selfs (even after culling of less vigorous individuals at the nursery stage) would not be effective for diameter growth, but it might be a reasonably good strategy for form traits, Dothistroma resistance, and wood density. FOR. SCI. 50(5):571–578.
Keywords: Dothistroma resistance; Inbreeding depression; early selection; environmental management; forest; forest management; forest resources; forestry; forestry research; forestry science; growth rate; heritability; natural resource management; natural resources; tree form
Document Type: Regular Article
Affiliations: New Zealand Forest Research Institute Private Bag 3020 Rotorua New Zealand Phone: +64 7 343 5732;, Fax: +64 7 348 0952, Email: Satish.Kumar@forestresearch.co.nz
Publication date: October 1, 2004
- Forest Science is a peer-reviewed journal publishing fundamental and applied research that explores all aspects of natural and social sciences as they apply to the function and management of the forested ecosystems of the world. Topics include silviculture, forest management, biometrics, economics, entomology & pathology, fire & fuels management, forest ecology, genetics & tree improvement, geospatial technologies, harvesting & utilization, landscape ecology, operations research, forest policy, physiology, recreation, social sciences, soils & hydrology, and wildlife management.
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