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林业科学 ›› 2025, Vol. 61 ›› Issue (11): 242-254.doi: 10.11707/j.1001-7488.LYKX20240653

• 研究简报 • 上一篇    

刺槐群体遗传多样性分析及其核心种质初步筛选

梁燕1,王因花1,*(),燕丽萍1,孔雨光2,李庆华1,仲伟国1,田泽新1,董元夫3,张元帅3   

  1. 1. 山东省林业科学研究院 山东省生态林草遗传育种重点实验室 济南 250014
    2. 山东省国土空间规划院 济南 250014
    3. 费县国有大青山林场 临沂 276000
  • 收稿日期:2024-11-03 修回日期:2025-02-18 出版日期:2025-11-25 发布日期:2025-12-11
  • 通讯作者: 王因花 E-mail:415474942@qq.com
  • 基金资助:
    山东省农业良种工程项目(2023LZGC012-2);泰山学者工程项目。

Analysis of Genetic Diversity in Robinia pseudoacacia Populations and Preliminary Screening of the Core Germplasm

Yan Liang1,Yinhua Wang1,*(),Liping Yan1,Yuguang Kong2,Qinghua Li1,Weiguo Zhong1,Zexin Tian1,Yuanfu Dong3,Yuanshuai Zhang3   

  1. 1. Shandong Academy of Forestry Shandong Provincical Key Laboratory of Ecological Forest and Grassland Genetics and Breeding Jinan 250014
    2. Shandong Territorial and Spatial Planning Institute Jinan 250014
    3. Feixian State-Owned Daqingshan Forest Farm Linyi 276000
  • Received:2024-11-03 Revised:2025-02-18 Online:2025-11-25 Published:2025-12-11
  • Contact: Yinhua Wang E-mail:415474942@qq.com

摘要:

目的: 基于荧光SSR分子标记技术分析刺槐群体遗传多样性和遗传结构,初步筛选核心种质资源,为科学管理和保存刺槐种质资源、精确构建核心种质资源库以及有效提高育种效率提供理论参考。方法: 利用17对荧光SSR引物,分析来自美国阿巴拉契亚、北京、河南、山东、山西、辽宁6个种源地323份刺槐种质资源群体的遗传多样性和遗传结构,应用Gene Marker 2.2.0 结合POPGENE 32软件计算观测等位基因数(Na)、有效等位基因数(Ne)、观测杂合度(Ho)、期望杂合度(He)、Shannon信息指数(I)、Nei’s基因多样性指数(H)和种群间F值。运用PowerMaker软件获得多态性信息含量(PIC)值。利用Structure软件分析刺槐种群结构,使用Python 3算法中的Evanno2005方法推断划分最佳遗传类群。采用最小距离逐步抽样法(LDSS)构建核心种质库后进行优化,t检验验证优化核心种质库的代表性。结果: 323份刺槐种质资源群体共扩增出135个等位基因,平均每对引物扩增7.941个等位基因,有效等位基因数均值2.808,Shannon信息指数均值1.200,观测杂合度均值0.191,期望杂合度均值0.588,Nei’s基因多样性指数均值0.589,多态信息含量均值0.544,表明刺槐群体遗传多样性较高;6个地理来源刺槐群体整体分析显示遗传多样性最高为辽宁、最低为北京;6个地理来源323份刺槐种质资源可划分为2个亚群,基因变异主要存在于种质资源个体间。最小距离逐步抽样法确定初始核心种质资源库最佳比例为20%,优化核心种质资源库比例为23.220%,确定248份保留种质、63份初始核心种质、12份补充种质,共筛选出75份核心种质,北京6份、河南8份、美国阿巴拉契亚17份、山西8份、山东29份、辽宁7份;核心种质资源库相比原始种质资源库Na保留比例100.00%,NeIHoHeH分别增加0.423、0.245、0.267、0.192和0.197,t检验表明核心种质库能够充分代表原始种质资源群体的遗传多样性。结论: 323份刺槐种质资源群体遗传多样性处于较高水平,遗传结构与地理来源相关性较小,初步构建的核心种质库可为下一步的资源保护和高效利用提供参考。

关键词: 刺槐, 荧光SSR, 遗传多样性, 遗传结构, 核心种质库

Abstract:

Objective: The genetic diversity and genetic structure of Robinia pseudoacacia populations were studied by fluorescent SSR molecular marker technique, and the core germplasm resources were preliminarily screened, in order to provide some theoretical references for scientific management and conservation of R. pseudoacacia germplasm resources, accurate construction of the core germplasm resource bank and effective improvement of breeding efficiency. Method: The genetic diversity and genetic structure of 323 R. pseudoacacia germplasm populations from 6 provenance regions of Appalachia in USA, Beijing, Henan, Shandong, Shanxi and Liaoning were analyzed using 17 pairs of fluorescent SSR primers. The software Gene Marker 2.2.0 and POPGENE32 were used to calculate and observed allele number (Na), effective allele number (Ne), observed heterozygosity (Ho), expected heterozygosity (He), Shannon information index (I), Nei’s gene diversity index (H) and inter-population F value. The polymorphism information content (PIC) value was obtained by PowerMaker software. The software Structure was used to analyze the population structure of R. pseudoacacia, and the Evanno2005 method in Python 3 algorithm was used to infer and divide the best genetic groups. The least distance step-up sampling method (LDSS) was used to construct the core germplasm and optimize it. The representativeness of the optimized core germplasm bank was verified by t test. Result: A total of 135 alleles were amplified from 323 R. pseudoacacia germplasm resources. Through calculation and analysis, the results showed that the average value of allele number (Na) amplified by each primer pair was 7.941, the average value of effective allele number (Ne) was 2.808, the average value of Shannon information index (I) was 1.200, the average value of observed heterozygosity (Ho) was 0.191, the average value of expected heterozygosity (He) was 0.588, the average value of Nei’s diversity index (H) was 0.589, and the average value of polymorphism information content (PIC) was 0.544, indicating that the genetic diversity of R. pseudoacacia population was high. According to the analysis of 6 geographical source populations of R. pseudoacacia, the highest genetic diversity was in Liaoning and the lowest was in Beijing. There were 6 geographical sources of 323 R. pseudoacacia germplasm resources, which could be divided into 2 subgroups, and the gene variation mainly existed among germplasm resources individuals. The LDSS was used to determine the optimal proportion of the initial core germplasm collection of 20% and the optimized core germplasm collection of 23.220%. After optimizing the core germplasm resource collection, 248 retained germplasm, 63 initial core germplasm and 12 supplementary germplasm were identified. A total of 75 core germplasm were screened, including 6 in Beijing, 8 in Henan, 17 in Appalachia of USA, 8 in Shanxi, 29 in Shandong and 7 in Liaoning. The retention rate of Na was 100.00%, and Ne, I, Ho, He and H increased by 0.423, 0.245, 0.267, 0.192 and 0.197, respectively. The t test showed that the core germplasm collection could fully represent the genetic diversity of the original germplasm resource populations. Conclusion: The genetic diversity of 323 R. pseudoacacia germplasm resources is at a high level, and there is no significant correlation between genetic structure and geographical origin. The preliminarily constructed core germplasm collection can provide a reference for further resource conservation and efficient utilization.

Key words: Robinia pseudoacacia, fluorescent SSR, genetic diversity, genetic structure, core germplasm collection

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