文献类型：期刊文献

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

作者：Sun, Chao[1,2] Lai, Meng[1,3] Zhang, Shougong[1,2] Sun, Xiaomei[1,2]

第一作者：孙超

通信作者：Sun, XM[1];Sun, XM[2]

机构：[1]Chinese Acad Forestry, Res Inst Forestry, Key Lab Tree Breeding & Cultivat, State Forestry Adm, Beijing 100091, Peoples R China;[2]China Acad Forestry, State Key Lab Tree Genet & Breeding, Beijing 100091, Peoples R China;[3]Jiangxi Agr Univ, Coll Forestry, Key Lab Silviculture, Coinnovat Ctr Jiangxi Typ Trees Cultivat & Utiliz, Nanchang 330045, Jiangxi, Peoples R China

年份：2017

卷号：4

期号：4

起止页码：482-492

外文期刊名：FRONTIERS OF AGRICULTURAL SCIENCE AND ENGINEERING

收录：Scopus(收录号：2-s2.0-85041547340);WOS:【ESCI(收录号:WOS:000424570400013)】；

基金：This work was supported by "the Fundamental Research Funds for the Central Non-profit Research Institution of CAF (CAFYBB2017ZA001-4)". We gratefully thank Prof. Harry X. Wu for his revision of our manuscript. The help of Changgeng Ma, Yunhui Xie, Shu Diao, and Weibo Xiang is also acknowledged.

语种：英文

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

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 different 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.