江西农业大学学报2025，Vol.47Issue(2)：414-425,12.DOI:10.3724/aauj.2025037
基于多点试验的湿地松半同胞家系早期选择研究
Early selection of half sibling families of Pinus elliottii based on multi-point experiments
摘要
Abstract
[Objective]This study aims to investigate the genetic variation patterns of growth traits in half-sib families of Pinus elliottii plantations across multiple sites,with the goal of early selection of superior families for Pinus elliottii.[Method]Taking the 2-year-old progeny test forest of Pinus elliottii established in three places in Jiangxi Province as the object,the seedling height and ground diameter were investigated.Genetic parameters were estimated using the HalfsibMS package developed by the Key Laboratory of Forest Genetics and Breeding at Nanjing Forestry University.Comprehensive evaluation and early selection of 18 Pinus elliottii families were performed through breeding value estimation,multiple comparison methods,and comprehensive selection index methods,combined with uniformity indicators.[Result]The variation ranges of tree height and diameter traits in the 2-year-old progeny test forest of Pinus elliottii families were 43 to 198 cm and 0.8 to 6.2 cm,respectively,with genetic variation coefficients of 22.81%to 45.83%.The differences in tree height and diameter growth among families were highly significant(P<0.01),and there were interaction effects on growth traits among the three locations.The estimated genetic parameters indicated that the family heritability for tree height and diameter were 0.573 9 and 0.647 6,respectively,with individual heritability values of 0.108 9 and 0.184 7,indicating high family heritability,genetic stability,and minimal environmental influence.The breeding value estimation results showed differences in growth trait breeding values among Pinus elliottii families.Among them,the top 5 families in terms of tree height are Family No.3,4,6,1 and 5;the top 5 families in terms of ground diameter are Family No.4,1,3,2 and 6.By leveraging a joint selection strategy based on breeding values and comprehensive methods,families 3,4,2,and 6 were preliminarily identified as superior families.Based on breeding values and comprehensive index joint selection,families 3,4,2,and 6 were identified as superior families;further selection based on uniformity indicated that families 3,4,and 6 were the final selected superior families.Genetic gain estimates for the final selected three superior families showed height genetic gains and actual gains of 12.98%,12.1%,and 11.6%;and 20.04%,18.6%,and 17.94%,respectively.Ground diameter genetic gains and actual gains were 14.29%,9.13%,and 10.34%;and 24.9%,15.9%,and 17.97%,indicating their genetic advantages and application potentials.[Conclusion]Taking the breeding value as the main factor and combining it with other methods to carry out comprehensive evaluation and early selection can effectively screen out the excellent families that meet the breeding objectives.Combined with the results of the joint selection of breeding values,comprehensive selection indices and uniformity indices,the excellent half-sib families with high genetic gains,good comprehensive evaluations,high breeding values and excellent uniformity are Family No.3,Family No.4 and Family No.6,These families provide good germplasm material for subsequent genetic improvement and stand establishment of Pinus elliottii.关键词
湿地松/多地点子代测定/早期选择/遗传参数Key words
Pinus elliottii/progeny determination/early selection/genetic parameters分类
农业科技引用本文复制引用
谢金文,靳藏馥,张露,万振和,朱柯帆,陈彬,孙世武,肖玉花,潘俊彬..基于多点试验的湿地松半同胞家系早期选择研究[J].江西农业大学学报,2025,47(2):414-425,12.基金项目
江西省林业科技创新专项(202114、201811)Project supported by the Jiangxi Province Forestry S&T Innovation Program(202114,201811) （202114、201811）
