中国农业科学 ›› 2021, Vol. 54 ›› Issue (8): 1751-1760.doi: 10.3864/j.issn.0578-1752.2021.08.014

• 园艺 • 上一篇    下一篇

利用SNP标记构建茶树品种资源分子身份证

樊晓静1(),于文涛2(),蔡春平2,林浥1,王泽涵1,房婉萍3,张见明4,叶乃兴1()   

  1. 1福建农林大学园艺学院/茶学福建省高校重点实验室,福州 350002
    2福州海关技术中心/福建省检验检疫技术研究重点实验室,福州 350001
    3南京农业大学园艺学院,南京 210095
    4武夷学院科研处,福建武夷山 354300
  • 收稿日期:2020-08-28 接受日期:2020-09-27 出版日期:2021-04-16 发布日期:2021-04-25
  • 通讯作者: 于文涛,叶乃兴
  • 作者简介:樊晓静,E-mail: 1187248076@qq.com
  • 基金资助:
    福建省“2011协同创新中心”中国乌龙茶产业协同创新中心专项(闽教科〔2015〕75号);海关总署科技项目(2020HK187);福建农林大学茶产业链科技创新与服务体系建设项目(2020-01);福建张天福茶叶发展基金会科技创新基金(FJZTF01)

Construction of Molecular ID for Tea Cultivars by Using of Single- nucleotide Polymorphism (SNP) Markers

FAN XiaoJing1(),YU WenTao2(),CAI ChunPing2,LIN Yi1,WANG ZeHan1,FANG WanPing3,ZHANG JianMing4,YE NaiXing1()   

  1. 1College of Horticulture, Fujian Agriculture and Forestry University/Key Laboratory of Tea Science in Universities of Fujian Province, Fuzhou 350002
    2Technology Centre of Fuzhou Customs District/Fujian Key Laboratory for Technology Research of Inspection and Quarantine, Fuzhou 350001
    3College of Horticulture, Nanjing Agricultural University, Nanjing 210095
    4Wuyi University, Wuyishan 354300, Fujian
  • Received:2020-08-28 Accepted:2020-09-27 Online:2021-04-16 Published:2021-04-25
  • Contact: WenTao YU,NaiXing YE

摘要:

【目的】建立茶树品种的SNP分子标记数据库,结合茶树品种基本信息,将SNP位点组成的DNA指纹图谱构建28位数字组成的茶树品种资源分子身份证,便于茶树品种资源的保护与精准管理,避免“同名异物、同物异名”的现象。【方法】通过挖掘茶树的表达序列标签,获得大量的高质量表达序列标签,将其进行装配后,开发候选位点,将候选位点与茶树全基因组进行BLAST,得到其在全基因组染色体上的位置与具体关联基因。以铁观音、福鼎大白茶、龙井43、云抗10号等103份国内外不同类型的茶树品种资源为供试材料,提取基因组DNA,利用预扩增技术和微流体芯片法对供试茶树品种资源进行SNP基因分型,获得SNP位点数据及候选SNP位点的信息指数、观测杂合度、期望杂合度等信息,将多态性从高到低进行排序,进行SNP位点组合筛选,得到最优SNP位点组合后,结合茶树品种基本信息构建茶树品种资源分子身份证。【结果】从茶树的表达序列标签数据库中挖掘出1 786个候选SNP位点。根据序列保守性,筛选出96个SNP标记位点,与最新茶树基因组比对发现候选位点较均匀地分布于茶树全基因组的15条染色体上;对茶树品种资源的候选SNP位点的多态性信息进行分析,剔除10个不具多态性的位点,剩余86个位点的信息指数平均值为0.517,观测杂合度平均值为0.370,期望杂合度平均值为0.346,固定指数平均值为-0.036,次等位基因频率平均值为0.269。从86个SNP位点中筛选出24个多态性高的SNP位点,组成DNA指纹图谱,可区分出全部参试茶树品种资源。对24个SNP位点组成的DNA指纹图谱并结合茶树品种资源基本信息进行数字编码,最终形成由28位数字组成的茶树品种资源分子身份证。【结论】依据SNP标记的多态性信息,筛选SNP位点,精准区分全部供试茶树品种,并将24个SNP位点所构建的茶树品种资源DNA指纹图谱及品种资源的基本属性信息编码成特定的数字串,使每份茶树品种资源具有唯一的分子身份证,并生成相应的条形码和二维码,可快速被扫码设备识别。

关键词: 茶树, 品种资源, SNP, 分子身份证, DNA指纹图谱

Abstract:

【Objective】In order to facilitate the protection and precise management of tea cultivars and avoid the phenomenon of homonyms and synonyms, single-nucleotide polymorphism (SNP) molecular marker database of tea cultivars was established, and the 28 digit molecular identities of tea cultivars were constructed by DNA fingerprinting of SNP loci and the basic information of tea cultivars. 【Method】By mining the expressed sequence tags (EST) of tea plants, a large number of high-quality ESTs were obtained. Then, the ESTs were assembled to develop candidate SNP loci. And, high-quality SNPs for tea plants were screened. Furthermore, the candidate SNP loci were compared with the whole genome of tea plant to confirm their positions on the chromosomes and specific genes. The genomic DNA was extracted from fresh leaves of 103 tea cultivars. Subsequently, the genotyping of accessions was carried out on microfluidic chips. Information index, observed heterozygosity and expected heterozygosity of the candidate SNPs were obtained. The SNP loci were further screened by their polymorphism, obtaining the optimal combination of SNP loci. The molecular identities of tea cultivars were finally constructed by combining the basic information of tea cultivars. 【Result】A total of 1 786 candidate SNP loci were selected from the EST database of Camellia sinensis. According to the sequence conservation, 96 SNP loci were selected. Compared with the latest tea plant genome, the candidate loci were evenly distributed on 15 chromosomes of the whole tea plant genome. The polymorphism information of candidate SNP loci of tea cultivars were analyzed, and 10 non-polymorphic loci were eliminated. The average values of information index, observed heterozygosity, expected heterozygosity, fixed index and minor allele frequency of the remaining 86 loci were 0.517, 0.370, 0.346, -0.036, 0.269, respectively. 24 SNPs, with high polymorphism, were screened out from 86 SNPs to distinguish all tea cultivars. Based on the fingerprint of 24 SNP markers and the basic information of tea cultivars, the tea molecular ID, which composed of 28 digits, was formed finally. 【Conclusion】According to the polymorphism information of SNP markers, the candidate SNP loci were screened. And all tea cultivars were accurately distinguished. Furthermore, The DNA fingerprints of 103 tea cultivars were constructed by the 24 SNP markers and the converted serial codes from information of the tea cultivars, each germplasm thus has a unique molecular identity code, and the bar codes and quick response (QR) codes are generated as the molecular ID card, which can be quickly identified by the code scanning equipment.

Key words: Camellia sinensis, cultivar, SNP, molecular ID, DNA fingerprint