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Radial and between-family variations of the microfibril angle and the relationships with bending properties in Picea jezoensis families

Jun Tanabe, Futoshi Ishiguri, Akira Tamura, Jyunichi Ohshima, Kazuya Iizuka, Shinso Yokota
Scandinavian journal of forest research 2017 v.32 no.1 pp. 39-44
Picea jezoensis, bark, bending strength, juvenile wood, juveniles, latewood, modulus of elasticity, modulus of rupture, open pollination, pith, tracheids, tree breeding, trees, wood, wood density, wood quality
With emphasis on tree breeding for wood quality in Picea jezoensis , we aimed to evaluate radial and between-family variations in the microfibril angle (MFA) of the S ₂ layer in the latewood tracheids in 10 open-pollinated families of 43-year-old P. jezoensis trees. In addition, the relationships between MFA/wood density with the modulus of elasticity (MOE) or modulus of rupture (MOR) were investigated. Significant differences in MFA between families were found from the pith toward the bark. MFA showed higher values around the pith area, although some families showed relatively lower values than others around this area. In addition, due to a larger coefficient of variations of MFA near the pith, the potential for juvenile wood MFA improvement may be greater compared with mature wood. MOE was correlated with MFA in juvenile wood and with wood density in mature wood, whereas MOR was mainly correlated with wood density at radial positions in both woods. Therefore, to improve the MOE and MOR of P. jezoensis wood, both MFA and wood density would be factors to consider in both juvenile and mature woods. On the other hand, there are indications that, only wood density would be an important criterion for improving mature wood properties.