文献类型：期刊文献

中文题名：Age-related trends in genetic parameters for wood properties in Larix kaempferi clones and implications for early selection

英文题名：Age-related trends in genetic parameters for wood properties in Larix kaempferi clones and implications for early selection

作者：Chao SUN[1,2] Meng LAI[1,3] Shougong ZHANG[1,2] Xiaomei SUN[1,2]

第一作者：孙超

机构：[1]Key Laboratory of Tree Breeding and Cultivation of State Forestry Administration, Research Institute of Forestry,Chinese Academy of Forestry;[2]State Key Laboratory of Tree Genetics and Breeding, Chinese Academy of Forestry;[3]Key Laboratory of Silviculture, Co-Innovation Center of Jiangxi Typical Trees Cultivation and Utilization,College of Forestry, Jiangxi Agricultural University

年份：2017

卷号：0

期号：4

起止页码：482-492

中文期刊名：农业科学与工程前沿：英文版

收录：Scopus

基金：supported by"the Fundamental Research Funds for the Central Non-profit Research Institution of CAF(CAFYBB2017ZA001-4)"

语种：英文

中文关键词：early selection;genetic variation;wood properties;Silvi Scan;Larix kaempferi

外文关键词：early selection;genetic variation;wood properties;Silvi Scan;Larix kaempferi

分类号：S791.223

摘要：Wood properties are important traits that determine quality of structural wood. With the aim of performing efficient early selection for wood properties we investigated genetic variation in 20 Larix kaempferi clones aged from 4 to 15 years for four quality traits: wood density, wall thickness to lumen area, microfibrillar angle(MFA) and modulus of elasticity(MOE). We observed that age-related trends in overall means varied for differen traits: MFA decreased with the age, while the others generally increased with the age. Phenotypic variance always showed significant differences from the age of 8 years onward, with CVG ranging from 4% to 25%. Also clonal repeatability increased steadily until 9 years old and then kept medium or higher intensity(0.4–0.8). After the age of 6, genetic correlations were generally higher than phenotypic correlations. Estimates of early selection efficiency suggested that the optimal selection age for wood density was at age 5–6 years, while it was 9–10 years for the other traits. In combination with previous results we proposed a comprehensive early selection strategy for larch clonal breeding that involved selection based on nursery rooting ability, phenology, growth traits, and wood properties.
Wood properties are important traits that determine quality of structural wood. With the aim of performing efficient early selection for wood properties we investigated genetic variation in 20 Larix kaempferi clones aged from 4 to 15 years for four quality traits: wood density, wall thickness to lumen area, microfibrillar angle(MFA) and modulus of elasticity(MOE). We observed that age-related trends in overall means varied for differen traits: MFA decreased with the age, while the others generally increased with the age. Phenotypic variance always showed significant differences from the age of 8 years onward, with CVG ranging from 4% to 25%. Also clonal repeatability increased steadily until 9 years old and then kept medium or higher intensity(0.4–0.8). After the age of 6, genetic correlations were generally higher than phenotypic correlations. Estimates of early selection efficiency suggested that the optimal selection age for wood density was at age 5–6 years, while it was 9–10 years for the other traits. In combination with previous results we proposed a comprehensive early selection strategy for larch clonal breeding that involved selection based on nursery rooting ability, phenology, growth traits, and wood properties.