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Genetic Variation in MFA, MOE and Wood Density Among Clones of Pinus taeda L.

Breeding and selection for desirable wood properties will be a key factor in determining the global competitiveness of forest industry in the United States. Microfibril angle (MFA), modulus of elasticity (MOE) and wood density are the most important wood characteristic that affect solid wood properties. Forty-five clones from nine full-sib families of loblolly pine were sampled in this study to study genetic variation in these traits. The experimental design was split-plots with seedlings and rooted cuttings of the same full-sib families in whole plots. In rooted cutting plots, 5 to 9 clonal sub-plots were established per family, with each sub-plot consisting of two ramets. The field trials were established in two locations with six complete blocks within each site. Increment cores (12 mm thick) were sampled from breast height of the stems. Wood properties were measured by SilviScan® 2, an instrument that combines x-ray densitometry, diffractometry and image analysis to measure a variety of wood properties.

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Author(s): Fikret Isik, Bailian Li, Barry Goldfarb

Publication: Tree Improvement and Genetics - Southern Forest Tree Improvement Conference - 2005