Key message

We assessed the narrow-sense heredity and genetic gains of multiple traits obtained using the indirect selection method for progeny of Cryptomeria japonica D. Don by artificial crossing. Using stress wave velocity and Pilodyn penetration depth as indicative parameters, wood properties could be improved in future generations of C. japonica plus trees and forest breeding programs will become more efficient.

Context

To advance generations of C. japonica D. Don breeding populations, the narrow-sense heredity and genetic gain of traits of progenies are required to assess the practical genetic performance of parental trees and improve traits.

Aims

We assessed the genetic gains in both growth characteristics and wood properties by indirect selection using full-sib progenies of C. japonica plus trees produced through artificial crosses.

Methods

In 18-year-old progenies of 549 trees, we assessed growth characteristics, dynamic modulus of elasticity, basic density, stress wave velocity, and Pilodyn penetration depth. Genetic parameters were calculated using a mixed model and the breedR package.

Results

The genetic correlation between growth characteristics and wood properties was low. The efficiencies of indirect selection for dynamic modulus of elasticity by stress wave velocity and for basic densities by Pilodyn penetration depth were higher than those for growth characteristics by stress wave velocity and Pilodyn penetration depth, respectively. Strong correlations were found between the parental clonal values and breeding values of parental trees predicted from progeny using stress wave velocity and Pilodyn penetration depth.

Conclusion

Using stress wave velocity and Pilodyn penetration depth as indicative parameters, future generations of C. japonica plus trees could produce superior wood properties. Growth characteristics and wood properties are independent; thus, both traits could be genetically improved compatibly.

中文翻译：

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可以通过间接选择和无损测量在日本雪松（Cryptomeria japonica。D. Don）的全同胞家族中以及树木无性繁殖中获得木材特性的遗传增益。

关键信息

我们 通过人工杂交对柳杉 后代的间接选择方法进行了评估，获得了多个性状的狭义遗传和遗传增益。使用应力波速度和Pilodyn穿透深度作为指示参数，可以在未来的 C. japonica 加上树木的情况下改善木材特性，森林育种程序将变得更加高效。

语境

为了使日本粳稻Don Don育种种群向前发展，需要评估子代性状的狭义遗传和遗传增益，以评估亲本树的实际遗传性能并改善其性状。

目的

我们评估了两种生长特性及材性通过间接选择使用的全同胞后代的遗传增益大蚕蛾加上经过人工杂交产生的树木。

方法

在549棵树木的18岁后代中，我们评估了生长特性，动态弹性模量，基本密度，应力波速度和Pilodyn穿透深度。使用混合模型和brineR软件包计算遗传参数。

结果

生长特性和木材特性之间的遗传相关性很低。通过应力波速度间接选择动态弹性模量和通过Pilodyn穿透深度间接选择基本密度的效率分别高于通过应力波速度和Pilodyn穿透深度进行生长特性的间接选择效率。利用应力波速度和皮洛第穿透深度，从后代预测的亲本克隆值与亲本树的育种值之间发现很强的相关性。

结论

使用应力波速度和Pilodyn穿透深度作为指示参数，C。japonica plus树木的后代可以产生出众的木材性能。生长特性和木材特性是独立的；因此，两个特征可以在遗传上相辅相成。