| 摘要: |
| 湿地松Pinus elliottii是引进树种，遗传基础变窄是高世代育种面临的严重问题，需要不断补充新的基因资源。研究对二十世纪90年代从美国引进的126个全同胞家系、32个自由授粉家系湿地松种子营建的基因资源林进行了生长量调查分析，结果显示，与一代种子园和改良种子园生产的子代相比，个体树高、胸径、材积的最大值和最小值均来自引进的子代群体，表明新引进群体包含更多的遗传变异；树高、胸径、材积的单株狭义遗传力范围分别为0.323-0.417、0.218~0.392、0.255~0.426，与其它报道范围一致，生长量性状受中等程度的遗传控制。使用个体模型分别计算全同胞家系、半同胞家系所有个体的育种值并以材积育种值为标准进行了排名，全同胞家系排名前30的个体集中在7个家系，半同胞家系排名前15的集中在5个家系，为保证更多的遗传多样性，从这12个家系中选择1~2个个体补充到新一轮的育种群体中，有效的拓宽现有湿地松育种群体的遗传背景。 |
| 关键词: 湿地松 引种 遗传基础 种子园 |
| DOI： |
| 分类号: |
| 基金项目:广东省林业科技创新项目(2019KJCX019) |
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| Evaluation of Individual Breeding Value of Pinus elliottii’s Introduction Families |
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tan zhiqiang1, deng leping1, li yiliang2, chen xiuyun1, li fuming1, guo wenbing2, zhao fencheng2, wang zhe2
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1.Hongling Seed Orchard;2.Guangdong Provincial Key Laboratory of Silviculture, Protection and Utilization/ Guangdong Academy of Forestry
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| Abstract: |
| Pinus elliottii is an introduced tree species. The narrowing of the genetic basis is a serious problem faced by high-generation breeding, and new genetic resources need to be continuously supplemented. This study conducted a survey and analysis of the growth of genetic resource forests constructed by seeds of 126 all-sibling families and 32 open-pollinated families from the United States in the 1990s. The results showed that compared with the progeny produced by the first-generation seed orchard and the improved seed orchard, the maximum and minimum individual tree height, DBH, and volume all came from the introduced progeny population, indicating that the newly introduced population contains more genetic variation. The narrow-sense heritability ranges of tree height, DBH, and volume were0.323-0.417, 0.218-0.392 and 0.255-0.426 respectively, which were consistent with other reports. The growth traits were under moderate genetic control. The individual models were used to calculate the breeding values of all individuals in the full-sib family and half-sib family and ranked based on the volume breeding value. The top 30 individuals in the full-sib family were concentrated in 7 families, and the top 15 individuals in the half-sib family were concentrated in 5 families. In order to ensure more genetic diversity, 1-2 individuals from these 12 families were selected to be added to the new round of breeding population. These individuals effectively broaden the genetic background of the existing P. elliottii breeding population. |
| Key words: Pinus elliottii introduction genetic basis seed orchard |
