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草业学报 ›› 2022, Vol. 31 ›› Issue (11): 48-60.DOI: 10.11686/cyxb2022137

• 研究论文 • 上一篇    下一篇

基于SCoT标记的披碱草属种质遗传多样性分析及指纹图谱构建

潘静1,2,3(), 张俊超1,2,3, 陈有军1,2,3, 周青平1,2,3()   

  1. 1.西南民族大学青藏高原研究院,四川 成都 610041
    2.四川省抗逆牧草种质创新及生态修复工程实验室,四川 成都 610041
    3.四川若尔盖高寒湿地生态系统国家野外科学观测研究站,四川 成都 610041
  • 收稿日期:2022-03-26 修回日期:2022-05-18 出版日期:2022-11-20 发布日期:2022-10-01
  • 通讯作者: 周青平
  • 作者简介:E-mail: qpingzh@yahoo.com.cn
    潘静(1997-),女,蒙古族,内蒙古通辽人,在读硕士。E-mail: 2671278923@qq.com
  • 基金资助:
    国家牧草产业技术体系(CAS34),西南民族大学中央高校基本科研业务专项经费项目(2021PTJS30);西南民族大学中央高校优秀学生培养工程项目(2021NYYXS03)

Genetic diversity analysis and fingerprint construction of Elymus germplasm based on SCoT markers

Jing PAN1,2,3(), Jun-chao ZHANG1,2,3, You-jun CHEN1,2,3, Qing-ping ZHOU1,2,3()   

  1. 1.Institute of Qinghai-Tibetan Plateau,Southwest Minzu University,Chengdu 610041,China
    2.Sichuan Provincial Stress Resistant Forage Germplasm Innovation and Ecological Restoration Engineering Laboratory,Chengdu 610041,China
    3.Sichuan Zoige Alpine Wetland Ecosystem National Observation and Research Station,Chengdu 610041,China
  • Received:2022-03-26 Revised:2022-05-18 Online:2022-11-20 Published:2022-10-01
  • Contact: Qing-ping ZHOU

摘要:

本研究利用SCoT分子标记对青藏高原披碱草属3个物种的种质资源开展遗传多样性分析和DNA指纹图谱构建,为不同物种的材料鉴定提供理论依据。在80个SCoT引物中筛选出22条引物进行PCR扩增,共扩增出290个条带,其中多态性条带254个,多态性条带比率占87.59%。Shannon多样性信息指数(I)、Nei’s 基因多样性指数(H)、观察等位基因数(Na)和有效等位基因数(Ne)的平均值分别为:0.5411、0.3643、1.9856和1.6270。聚类分析结果表明,遗传相似系数变化范围为0.50~0.80,在遗传相似系数为0.53处,可将46份材料分为2个组群,主坐标分析结果与聚类分析结果保持一致,同时利用4个SCoT引物构建了46份材料的DNA指纹图谱。SCoT分子标记适用于披碱草属种质资源遗传多样性分析及DNA指纹图谱构建,该研究为野生披碱草属种质鉴定、优质性状挖掘、育种实践提供了理论基础。

关键词: 披碱草属, SCoT分子标记, 遗传多样性, 指纹图谱

Abstract:

In this study, SCoT molecular markers were used to analyze the genetic diversity and construct DNA fingerprints of three species of Elymus on the Qinghai-Tibet Plateau to provide a theoretical basis for identification of the different species in collection material. Among 80 SCoT primers, 22 primers were selected for PCR amplification, and a total of 290 bands were amplified, of which 254 were polymorphic with the percentage of polymorphic bands (PPB) of 87.59%. The average values of the Shannon diversity information index (I), Nei’s gene diversity index (H), the observed number of alleles (Na), and an effective number of alleles (Ne) were 0.5411, 0.3643, 1.9856, and 1.6270, respectively. Cluster analysis results showed that the genetic similarity coefficient ranged from 0.50 to 0.80. At a genetic similarity coefficient of 0.53, 46 collections could be divided into 2 groups, and the results of the principal coordinate analysis were consistent with those of cluster analysis. At the same time, the DNA fingerprints of 46 materials were constructed by using 4 SCoT primers. The SCoT molecular marker was suitable for genetic diversity analysis and DNA fingerprint construction of Elymus germplasm resources. This study provides fundamental information for germplasm identification, high-quality character mining, and breeding practice for wild Elymus.

Key words: Elymus, SCoT molecular marker, genetic diversity, fingerprint