Genetic parameters of growth and quality traits in open-pollinated silver birch progeny tests

IF 1.7 3区农林科学 Q2 FORESTRY

Silva Fennica Pub Date : 2020-01-01 DOI:10.14214/sf.10220

A. Gailis, P. Zeltiņš, Andis Purviņš, Juris Augustovs, Valts Vīndedzis, I. Zariņa, Ā. Jansons

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引用次数: 6

Abstract

Genetic parameters of growth and stem quality traits were estimated for open-pollinated silver birch Betula pendula Roth progenies in Latvia at the age of 10 and 14 years. Tree height and stem volume were found to be under strong genetic control at both inventories (narrow-sense heritabilities varied from 0.41 to 0.66). Mainly low heritabilities were found for stem defects, yet genetic control of branch diameter, stem straightness and overall stem quality varied from low to high depending on study site. High additive genetic coefficient of variation was found for stem volume (25.3–32.5%). Genetic correlations among growth traits were strong and positive (0.90–0.99). Mainly weak genetic correlations between growth and quality traits implied simultaneous improvement. Still, strong negative correlations between branch angle and stem straightness might result in enlarged knot size for straighter logs. The genetic age-age correlations were strong. Weak genotype by environment interaction and stability of best genotypes over different sites was indicated by strong genetic correlations between trials. Each growth or quality trait alone showed substantial improvement in terms of estimated genetic gain (up to 62% over trial mean for stem volume). Therefore, selection index combining both growth and stem quality may be developed.

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开放授粉白桦子代生长和品质性状的遗传参数试验

对拉脱维亚开放授粉白桦(Betula pendula Roth) 10岁和14岁后代的生长和茎质量性状的遗传参数进行了估计。两种材料的树高和茎体积均受较强的遗传控制(狭义遗传力为0.41 ~ 0.66)。茎秆缺陷遗传力以低遗传力为主，而枝条直径、茎秆直度和整体茎秆质量的遗传控制因研究地点不同而有高低差异。茎体积的加性遗传变异系数较高(25.3 ~ 32.5%)。各生长性状间遗传相关均为正相关(0.90 ~ 0.99)。生长性状和品质性状之间的遗传相关性较弱，这主要意味着同时改良。尽管如此，分支角度和杆直度之间的强烈负相关可能导致更直的测井曲线的结尺寸增大。遗传年龄相关性很强。弱基因型受环境相互作用的影响，而最佳基因型在不同位点的稳定性表现为试验间的强遗传相关性。就估计遗传增益而言，每个生长或品质性状单独显示出显著的改善(茎体积比试验平均值高出62%)。因此，可以开发出生长质量和茎部质量相结合的选择指标。

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来源期刊

Silva Fennica 农林科学-林学

CiteScore

3.50

自引率

11.10%

发文量

审稿时长

3 months

期刊介绍： Silva Fennica publishes significant new knowledge on forest sciences. The scope covers research on forestry and forest ecosystems. Silva Fennica aims to increase understanding on forest ecosystems, and sustainable use and conservation of forest resources. Use of forest resources includes all aspects of forestry containing biomass-based and non-timber products, economic and social factors etc.