<abstract xmlns="http://www.w3.org/1999/xhtml"><p>Variance components of tree height (HT) and stem diameter at 1.3 m above the ground (DBH) were investigated for the eight open-pollinated families of <italic>Zelkova serrata</italic> (Thumb.) Makino planted with three different initial planting spacings in a progeny test site, Chiba, Japan. Parent–offspring correlations were also evaluated by using these families and their mother trees. The smallest values of HT and DBH were observed in the narrowest initial planting spacing (1.10 x 1.10 m) compared to those in medium (1.30 x 1.36 m) and wide (2.00 x 1.80 m) spacings, suggesting that adverse effects of competition with neighboring trees occurred on both height and radial growth. Similar to HT and DBH, the initial planting spacings also affected the genetic parameter estimates: the ratio of family variance component to total phenotypic variance showed the highest value in narrow initial planting spacing for both HT and DBH. Thus, family variance component might include competition effects, leading to biased genetic parameter estimates. In contrast, parent–offspring correlation coefficients showed the highest value in wide initial planting spacing where competition effect might be smaller. Therefore, the growth traits of <italic>Z. serrata</italic> might be inherited from the parent to the offspring when competition effect was small.</p></abstract>

Variance components of tree height (HT) and stem diameter at 1.3 m above the ground (DBH) were investigated for the eight open-pollinated families of Zelkova serrata (Thumb.) Makino planted with three different initial planting spacings in a progeny test site, Chiba, Japan. Parent–offspring correlations were also evaluated by using these families and their mother trees. The smallest values of HT and DBH were observed in the narrowest initial planting spacing (1.10 x 1.10 m) compared to those in medium (1.30 x 1.36 m) and wide (2.00 x 1.80 m) spacings, suggesting that adverse effects of competition with neighboring trees occurred on both height and radial growth. Similar to HT and DBH, the initial planting spacings also affected the genetic parameter estimates: the ratio of family variance component to total phenotypic variance showed the highest value in narrow initial planting spacing for both HT and DBH. Thus, family variance component might include competition effects, leading to biased genetic parameter estimates. In contrast, parent–offspring correlation coefficients showed the highest value in wide initial planting spacing where competition effect might be smaller. Therefore, the growth traits of Z. serrata might be inherited from the parent to the offspring when competition effect was small.

Variance components and parent–offspring cor- relations of growth traits vary among the initial planting spacings in <italic>Zelkova serrata</italic>

Forestry Research Institute, Chiba Prefectural Agriculture and Forestry Research Center

Forest Division, Chiba Prefectural Agriculture, Forestry and Fisheries Department

Forest Tree Breeding Center, Forestry and Forest Products Research Institute

Silvae Genetica

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Variance components and parent–offspring cor- relations of growth traits vary among the initial planting spacings in 

Variance components of tree height (HT) and stem diameter at 1.3 m above the ground (DBH) were investigated for the eight open-pollinated families of Zelkova...

Variance components and parent–offspring cor- relations of growth traits vary among the initial planting spacings in Zelkova serrata

Publié en ligne: 15 juin 2019

Pages: 45 - 50

DOI: https://doi.org/10.2478/sg-2019-0008

Mots clés
Competition effects, Inheritance from parent to off- spring, Planting density management, Repeatability, Tree breeding for hardwood

© 2019 Jun Tanabe et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Variance components and parent–offspring cor- relations of growth traits vary among the initial planting spacings in Zelkova serrata

Publié en ligne: 15 juin 2019

Pages: 45 - 50

DOI: https://doi.org/10.2478/sg-2019-0008

Mots clésCompetition effects, Inheritance from parent to off- spring, Planting density management, Repeatability, Tree breeding for hardwood

© 2019 Jun Tanabe et al., published by Sciendo

This work is licensed under the Creative Commons Attribution-NonCommercial-NoDerivatives 3.0 License.

Mots clés
Competition effects, Inheritance from parent to off- spring, Planting density management, Repeatability, Tree breeding for hardwood