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中国农学通报 ›› 2025, Vol. 41 ›› Issue (17): 144-151.doi: 10.11924/j.issn.1000-6850.casb2024-0725

• 水产·渔业 • 上一篇    下一篇

基于全基因组SNP变异分析江苏克氏原螯虾7个天然群体的遗传多样性特征

徐宇1(), 许志强1(), 严维辉1, 李佳佳1, 黄鸿兵1, 李旭光1, 刘远柱2, 潘建林1   

  1. 1 农业农村部淡水虾蟹遗传育种与养殖重点实验室(部省共建)/江苏省淡水水产研究所,南京 210017
    2 南京螯龙现代农业科技研究院有限公司,南京 211800
  • 收稿日期:2024-11-29 修回日期:2025-03-03 出版日期:2025-06-15 发布日期:2025-06-15
  • 通讯作者:
    许志强,男,1978年出生,江苏赣榆人,研究员,博士,主要从事水产动物种质资源保护与遗传育种研究。通信地址:210017 江苏南京建邺区南湖东路90号 江苏省淡水水产研究所,E-mail:
  • 作者简介:

    徐宇,女,1986年出生,江苏高邮人,副研究员,硕士,研究方向:水产动物种质资源保护与遗传育种。通信地址:210017 江苏南京建邺区南湖东路90号 江苏省淡水水产研究所,E-mail:

  • 基金资助:
    江苏省种业振兴“揭榜挂帅”项目“克氏原螯虾优异种质创制与新品种选育”(JBGS〔2021〕119); 江苏现代农业(克氏原螯虾)产业技术体系种质创新与苗种繁育创新团队(JATS〔2023〕372); 国家重点研发计划“中华绒螯蟹、克氏原螯虾、螺蛳大规格抗逆新品种培育”(2022YFD2400700)

Genetic Diversity Analysis of Seven Natural Populations of Procambarus clarkii from Jiangsu Province Based on Whole-Genome SNP Variations

XU Yu1(), XU Zhiqiang1(), YAN Weihui1, LI Jiajia1, HUANG Hongbing1, LI Xuguang1, LIU Yuanzhu2, PAN Jianlin1   

  1. 1 Key Laboratory of Genetic Breeding and Cultivation for Freshwater Crustacean, Ministry of Agriculture and Rural Affairs, Nanjing 210017
    2 Nanjing Aolong Modern Agricultural Science and Technology Research Institute Co., LTD, Nanjing 211800
  • Received:2024-11-29 Revised:2025-03-03 Published:2025-06-15 Online:2025-06-15

摘要:

为了解人工养殖活动对克氏原螯虾(Procambarus clarkii)天然群体遗传多样性的影响,本研究基于SLAF-Seq测序技术所开发的SNP分子标记,对江苏克氏原螯虾主产区(微山湖、高邮湖、洪泽湖和骆马湖)和非主产区(滆湖、固城湖和阳澄湖)7个天然群体进行遗传多样性和遗传结构特征分析。在7个群体210尾个体中共检测到176486个SNP和24828个Indel,平均Q30和GC含量分别为92.77%和44.31%。结果发现:7个克氏原螯虾天然群体的平均多态信息含量(PIC)为0.2070~0.2246;期望杂合度(He)为0.2388~0.2854,观测杂合度(Ho)为0.3204~0.3387,群体中存在杂合子过剩现象。群体间遗传分化系数(Fst)为0.033~0.124,表现为中度分化;7个群体可分为4个血统,洪泽湖、骆马湖、高邮湖、滆湖4个群体划为一群,微山湖、固城湖和阳澄湖3个群体均单独划为一群,不同群体间显示出明显的地理分布格局。连锁不平衡分析表明,克氏原螯虾群体的LD衰减距离较短,100 bp物理距离内r2衰减至0.1以下。进一步的选择清除分析显示,主产区与非主产区不同群体间共有153个受到强烈选择的基因组区域,受选基因显著富集在Cell cycle、AMPK signaling pathway以及Meiosis等与克氏原螯虾能量代谢、氧化应激以及生长发育等生物学功能密切相关的基因通路。本研究揭示了江苏克氏原螯虾主产区和非主产区天然群体的遗传多样性特征,以期为国内克氏原螯虾种质资源的开发、利用与保护工作提供理论依据。

关键词: 克氏原螯虾, SLAF-Seq测序, SNP, 群体遗传结构, 遗传多样性, 江苏省

Abstract:

To explore the influence of artificial breeding activities on the genetic diversity of natural Procambarus clarkii populations, SNP molecular markers developed via SLAF-Seq sequencing technology were employed to analyze the genetic diversity and genetic structure of seven natural P. clarkii populations in Jiangsu Province. These populations included the main production areas (Weishan Lake, Gaoyou Lake, Hongze Lake, and Luoma Lake) and non-main production areas (Ge Lake, Gucheng Lake, and Yangcheng Lake). In total, 176486 SNPs and 24828 Indels were detected in 210 individuals from these populations. The average Q30 and GC contents were 92.77% and 44.31%, respectively. The average polymorphic information content (PIC) of the seven populations ranged from 0.2070 to 0.2246. The expected heterozygosity (He) was between 0.2388 and 0.2854, while the observed heterozygosity (Ho) ranged from 0.3204 to 0.3387, suggesting a certain degree of heterozygote excess in these populations. The coefficient of genetic differentiation (Fst) among populations varied from 0.033 to 0.124, indicating moderate differentiation. The seven populations could be divided into four lineages. The populations from Hongze Lake, Luoma Lake, Gaoyou Lake, and Ge Lake were classified as one group, and the remaining three populations from Weishan Lake, Gucheng Lake, and Yangcheng Lake formed separate groups respectively. This demonstrated clear geographical distribution patterns among the populations. Linkage disequilibrium (LD) analysis showed that the LD decay distance in the P. clarkii populations was short, with the r2 value decreasing to less than 0.1 within a 100-bp physical distance. Further selection sweep analysis revealed 153 strongly selected genomic regions between the main production area and non-main production area populations. These selected genes were significantly enriched in pathways such as the Cell cycle, AMPK signaling pathway, Meiosis, and other gene pathways closely related to the biological functions of P. clarkii. This study elucidated the genetic diversity characteristics of natural populations in both main and non-main production areas of P. clarkii in Jiangsu Province, thus providing a theoretical basis for the development, utilization and conservation of P. clarkii germplasm resources.

Key words: Procambarus clarkii, SLAF-seq, SNP, genetic structure, genetic diversity, Jiangsu Province