Jun Tanabe, Futoshi Ishiguri, Akira Tamura, Yuya Takashima, Jyunichi Ohshima, Kazuya Iizuka, Shinso Yokota. (2018). Within-tree radial and among-family variations in wood density, microfibril angle, and mechanical properties in Picea glehnii. Silva Fennica vol. 52 no. 2 article id 9914. https://doi.org/10.14214/sf.9914

Keywords: modulus of elasticity; modulus of rupture; early selection; tree breeding for wood quality

Highlights: The modulus of elasticity was affected by both microfibril angle and wood density, whereas the modulus of rupture was mainly affected by wood density in Picea glehnii; A larger degree of among-family variation in wood properties was detected in juvenile wood than in mature wood, indicating that genetic improvements in the mechanical properties may be more effective for juvenile wood.

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Genetic improvements in the mechanical properties of wood are important in forestry species used for lumber, such as Picea. The within-tree radial and among-family variations for the modulus of elasticity (MOE), modulus of rupture (MOR), and their related traits [i.e., microfibril angle (MFA) of the S₂ layer in latewood tracheid and air-dry density (AD)] were evaluated in nine open-pollinated families of Picea glehnii (F. Schmidt) Mast. The radial variation in MOR was mainly affected by AD, whereas MOE was affected by MFA and AD. Higher F-values obtained by analysis of variance and coefficient of variation were observed for all properties at the 6th–15th annual ring, except for AD at the 6th–10th annual ring. This result suggests that the contribution of genetic effect is larger in these highly variable regions. In addition, positive correlation coefficients were obtained between wood properties at the 6th–15th annual ring and mean values of these properties. Therefore, genetic improvements for MOE, MOR, and their related traits in P. glehnii is likely to be more effective in juvenile wood, specifically at the 6th–15th annual ring from the pith.

Tanabe, Faculty of Education, Chiba University, Chiba, 263-8522, Japan E-mail: tanabe_j@chiba-u.jp
Ishiguri, Faculty of Agriculture, Utsunomiya University, Utsunomiya 321-8505, Japan E-mail: ishiguri@cc.utsunomiya-u.ac.jp
Tamura, Forest Tree Breeding Center, Forestry and Forest Products Research Institute, Hitachi, 319-1301, Japan E-mail: akirat@affrc.go.jp
Takashima, Forest Tree Breeding Center, Forestry and Forest Products Research Institute, Hitachi, 319-1301, Japan E-mail: ytakashima@ffpri.affrc.go.jp
Ohshima, Faculty of Agriculture, Utsunomiya University, Utsunomiya 321-8505, Japan E-mail: joshima@cc.utsunomiya-u.ac.jp
Iizuka, Faculty of Agriculture, Utsunomiya University, Utsunomiya 321-8505, Japan E-mail: kiizuka@cc.utsunomiya-u.ac.jp
Yokota, Faculty of Agriculture, Utsunomiya University, Utsunomiya 321-8505, Japan E-mail: yokotas@cc.utsunomiya-u.ac.jp

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