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Genetic variation of wood density components in a radiata pine progeny test located in the south of Chile

Abstract : This article describes changes in the genetic variation of wood density components with cambial age and their relationship with the within-ring area components. Wood samples from 31 half-sib families of radiata pine were submitted to X-ray densitometry procedures. Traits studied were earlywood (ED) and latewood (LD) density, earlywood (EA) and latewood (LA) area, and latewood proportion (LP). Between rings 2 to 5 (juvenile wood) and 11 to 14 (mature wood), heritability estimates suggest that breeding for increased ED is feasible. Upward selection for ED would also be associated with a phenotypic reduction in EA in juvenile and mature wood. Between rings 6 to 10, the heritability estimates for ED indicate low genetic variation in the transition region. Attempts to increase ED by breeding might not have a significant impact on LD, though this trait showed a moderate genetic control in this region. Any change in ED and LD would have unclear effects on EA and LA, respectively, because of the changing pattern of genetic covariances.
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Francisco Zamudio, Philippe Rozenberg, Ricardo Baettig, Adriana Vergara, Marco Yañez, et al.. Genetic variation of wood density components in a radiata pine progeny test located in the south of Chile. Annals of Forest Science, Springer Nature (since 2011)/EDP Science (until 2010), 2005, 62 (2), pp.105-114. ⟨10.1051/forest:2005002⟩. ⟨hal-02677871⟩

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