Abstract
【Objective】 The study aims to investigate the genetic variation patterns in growth and wood traits among half-sib families of Liriodendron chinense, to select superior families, and thereby provide scientific guidance and essential breeding materials for the genetic improvement of this species. 【Method】 39 half-sib families of L. chinense served as the experimental material. Growth and wood traits were systematically measured at two key developmental stages: 2 and 7 years of age. A comprehensive analytical framework was employed, including analysis of variance (ANOVA), estimation of genetic parameters and breeding values, and correlation analysis. These methods were used to elucidate the patterns of genetic variation for traits at different ages and their interrelationships, forming the basis for selecting superior families for both rapid growth and desirable wood properties. 【Result】 The results of the analysis of variance revealed the presence of highly significant differences among families at 7 years of age for all measured traits, including tree height, diameter at breast height (DBH), individual tree volume, wood basic density, fiber traits, and vessel traits. This finding indicates a substantial and exploitable genetic variation at the family level, providing a robust foundation for selection. Estimation of genetic parameters showed that at 2 years old, the coefficient of variation (CV) for tree height was greater than that for ground diameter. By 7 years of age, however, the CV for DBH surpassed that of tree height. This shift suggests an increasing contribution of DBH to stem volume with ontogeny and its continued differentiation among families. The average phenotypic CV (34.17%) and genetic CV (24.90%) for growth traits at age 7 were both higher than those for wood traits (phenotypic CV 6.49%, genetic CV 5.20%), indicating that growth traits currently exhibit greater potential for genetic gain through selection compared to wood traits. Among the wood traits, wood basic density demonstrated the highest level of genetic variation (6.19%), followed by vessel traits (5.94%) and fiber traits (4.42%). Specifically, wood basic density, fiber wall thickness, and vessel lumen diameter showed more promising selection prospects compared to other wood characteristics. Heritability estimates revealed a trend of strengthening genetic control for stem diameter (from ground diameter at age 2 to DBH at age 7) with increasing age. At 7 years, several key traits were under strong genetic control, with family heritability estimates as follows: wood basic density (0.81), vessel traits (0.70), fiber traits (0.60), DBH (0.58), tree height (0.55), and volume (0.55). Targeting wood basic density, DBH, and volume for selection is therefore expected to yield high genetic gains. Correlation analysis identified significant negative genetic correlations between growth traits (tree height and DBH) and key wood quality traits (wood basic density and fiber wall thickness) at this specific developmental stage. This antagonistic relationship implies that advancing a multi-trait breeding program will require carefully balancing selection for both growth and wood properties. Based on the combined criteria of stem volume and wood basic density, 13 families were selected as superior for fast growth, and 12 families were selected as superior for wood quality. 【Conclusion】 7-year-old L. chinense half-sib families exhibit substantial genetic variation at the family level for tree height, DBH, wood basic density, fiber traits, and vessel traits. Among these, DBH, volume, and wood basic density demonstrate particularly significant potential for genetic improvement. The superior families identified through this study constitute valuable germplasm resources, providing critical material for the breeding and development of improved varieties of L. chinense.
Key words
Liriodendron chinense /
half-sib families /
genetic variation /
growth traits /
wood traits
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WANG Yunpeng, Yu Xiaoling, Hu Miao, Hu Ping, Zhong Yongda, Wu Zhaoxiang, Yang Aihong, Yu Faxin.
Genetic variation and selection of early growth and wood traits in half-sib families for Liriodendron chinense[J]. Journal of Nanjing Forestry University (Natural Sciences Edition）. 0 https://doi.org/10.12302/j.issn.1000-2006.202502008
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Funding
十四五国家重点研发计划(2022YFD2200104); 江西省重点研发计划项目(20252BCF320009); 江西省主要学科学术和技术带头人培养计划-青年人才项目(20212BCJ23032)
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