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外文期刊>Silvae genetica
>Variance components and parent–offspring cor- relations of growth traits vary among the initial planting spacings in Zelkova serrata
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Variance components and parent–offspring cor- relations of growth traits vary among the initial planting spacings in Zelkova serrata
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.
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机译:针对Zelkova Serrata(拇指的八个授粉的Zelkova Serrata(拇指)麦诺群中,研究了树高(HT)和茎直径的树木高度(HT)和茎直径为1.3米的茎直径。千叶,日本。通过使用这些家庭及其母树,还评估了父母后代相关性。与中等(1.30 x 1.36米)和宽(2.00 x 1.80米)间距相比,在最窄的初始种植间隔(1.10 x 1.10米)中观察到最小的HT和DBH值,表明竞争与邻居的不利影响在高度和径向生长中发生树木。与HT和DBH类似,初始种植间隔也影响了遗传参数估计:家族方差分量与总表型方差的比率显示出HT和DBH的窄初始种植间距中的最高值。因此,家庭方差分量可能包括竞争效应,导致偏置遗传参数估计。相反,父级后代相关系数在广泛的初始种植间隔中显示出最高值,其中竞争效果可能更小。因此,当竞争效应小时,Z.Serrata的生长特征可能是从父母继承到后代。
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