文献类型：期刊文献

英文题名：Across-rotation genetic analysis and multitrait selection in a cloned cross of Eucalyptus urophylla x E. tereticornis

作者：Xu, Jiahong[1,2,3] Zhou, Mingming[1,2] Weng, Qijie[1,2] Li, Mei[1,2] Gan, Siming[1,2]

第一作者：Xu, Jiahong

通信作者：Li, M[1];Gan, SM[1];Li, M[2];Gan, SM[2]

机构：[1]Chinese Acad Forestry, State Key Lab Tree Genet & Breeding, Beijing, Peoples R China;[2]Chinese Acad Forestry, Res Inst Trop Forestry, Key Lab State Forestry Adm Trop Forestry Res, Guangzhou, Peoples R China;[3]Nanjing Forestry Univ, Coll Forestry, Nanjing, Peoples R China

年份：2025

卷号：16

外文期刊名：FRONTIERS IN PLANT SCIENCE

收录：;WOS:【SCI-EXPANDED(收录号:WOS:001509847000001)】；

基金：The author(s) declare that financial support was received for the research and/or publication of this article. This work was financially supported by the Forestry Administration of Guangdong Province, China (2022KJCX024).

语种：英文

外文关键词：Eucalyptus hybrid; across-rotation traits; genetic parameters; multi-trait genetic selection; genetic gain; selection efficiency

摘要：Clonal testing is crucial for estimating genetic parameters and selecting elite clones. However, few studies have tested clones over two or more rotations. In this study, a clonal trial of the sibs from a Eucalyptus urophylla x Eucalyptus tereticornis cross was used for genetic parameter analyses and multitrait selection based on traits such as across-rotation growth, wood properties, coppicing ability, and coppice chlorophyll fluorescence. Clonal repeatability (H 2) estimates for growth traits in the first rotation ranged from 0.73 (diameter at breast height at age 15) to 0.84 (single-tree volume at age 2.5) and were generally higher than those for growth traits in the second rotation (0.11-0.62). H 2 estimates for coppicing and chlorophyll fluorescence traits ranged from 0.35 to 0.57 and 0.03 to 0.53, respectively, indicating low to medium genetic control of these traits. Phenotypic correlations ( r p ) and additive genetic correlations ( r g ) were generally high among growth traits within a single rotation and among coppicing traits but varied considerably across other trait pairs. In particular, second-rotation volume at 2.5 years showed a very weak r p but a moderately positive r g with early-stage volumes from the first rotation. Multitrait selection index (SI) and multitrait genotype-idiotype distance index (MGIDI) methods were applied at a selection intensity of 15% under four scenarios, each combining two to five traits. Relative genetic gain (RG) and selection efficiency (E) estimates were positive for all traits included in multitrait selection, indicating the usefulness of all selection scenarios. Compared to SI, the MGIDI method produced slightly lower RG and E values for volumes at ages 8 and 15 years, but higher RG and E values for wood basic density and cellulose content at age 8 in the first rotation. This study has important implications for eucalypt clonal breeding and management.