文献类型：期刊文献

英文题名：Effects of generation improvement of Cunninghamia lanceolata (Lamb.) Hook on genetic diversity and genetic structure in seed orchards

作者：Wu, Hanbin[1,2,3,4] Duan, Aiguo[2,3,4] Wang, Xihan[5] Chen, Zhiyun[6] Zhang, Xie[6] He, Guiping[7] Zhang, Jianguo[2,3,4]

第一作者：Wu, Hanbin

通信作者：Duan, AG[1];Zhang, JG[1]

机构：[1]Cent South Univ Forestry & Technol, Sch Forestry, Changsha 410004, Peoples R China;[2]Chinese Acad Forestry, Res Inst Forestry, State Key Lab Efficient Prod Forest Resources, Key Lab Tree Breeding & Cultivat Natl Forestry, Beijing 100091, Peoples R China;[3]Nanjing Forestry Univ, Collaborat Innovat Ctr Sustainable Forestry Southe, Nanjing 210037, Peoples R China;[4]Yuelu Mt Lab, Changsha 410004, Peoples R China;[5]State Owned Forestry Farm Weimin, Shaowu 354006, Fujian, Peoples R China;[6]Hunan Acad Forestry, Inst Forestry, Changsha 410004, Peoples R China;[7]Chinese Acad Forestry, Res Inst Subtrop Forestry, Hangzhou 311400, Peoples R China

年份：2026

卷号：239

外文期刊名：INDUSTRIAL CROPS AND PRODUCTS

收录：;EI(收录号：20255019686941);Scopus(收录号：2-s2.0-105024236985);WOS:【SCI-EXPANDED(收录号:WOS:001639137000001)】；

基金：This work was supported by the National Key Research and Development Special Project of China of the 14th Five-Year Plan, Research on Breeding of High-Yield, High-Quality and High-Efficiency New Varieties of Chinese Fir (Grant Number 2022YFD2200201) and the Scientific Research Start-up Fund for Introduced Talents of Central South University of Forestry and Technology (Grant Number 2025YJZ030).The authors are grateful to the anonymous reviewers and handling Editor for their constructive comments to improve the manuscript.

语种：英文

外文关键词：Chinese fir; Genetic diversity; Genetic structure; Seed orchard

摘要：Maintaining genetic diversity among generations in seed orchards is an important management goal because it lays a foundation for the generation process of seed orchards and the formulation of breeding plans. Meanwhile, clonal seed orchards play a pivotal role in supplying genetically improved seeds for afforestation, but the dynamics of genetic diversity and structure across multiple generations and geographic regions remain poorly understood. This study aimed to investigate genetic variation patterns across generations and geographic genetic differences in Chinese fir seed orchards using microsatellite markers. We analyzed genetic diversity, population structure, and co-ancestry of nine Chinese fir seed orchards, with three generations each in Hunan, Fujian, and Zhejiang provinces (representing central and marginal production regions, respectively). Results showed genetic diversity of the seed orchards remained relatively high (mean Ho = 0.553, He = 0.657) and exhibited distinct geographic variations with generational advancement, reflecting differences in parental selection strategies. Genetic diversity in Hunan (HN) first increased (HN2 > HN1) then slightly decreased (HN3 < HN2), while Fujian (FJ) showed a trend of initial decline followed by recovery (FJ1 > FJ3 > FJ2), and Zhejiang (ZJ) exhibited a gradual decrease (ZJ1 > ZJ2 > ZJ3). Geographic differences were evident, with diversity levels ordered ZJ > FJ > HN. Genetic differentiation among populations was low (Fst = 0.007 - 0.043), with 97.81 % of variance attributed to within-population variation. The population structure of the Hunan seed orchard was different from those of the Fujian and Zhejiang orchards, the population structure of Zhejiang's advanced-generation seed orchards risked genetic convergence. All seed orchard populations had mixed branches, which shows the complex relationships among the population genotypes. There was a moderate degree of genetic homology (56 %) among the seed orchard resources, and the genetic relationship between generations in seed orchards in the same region became closer as generations improved. Population genetic analysis will greatly promote the molecular breeding of Chinese fir.