华北农学报 ›› 2017, Vol. 32 ›› Issue (5): 69-77. doi: 10.7668/hbnxb.2017.05.011

所属专题: 甜椒辣椒

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基于花椒转录组序列SSR分子标记开发及花椒种质鉴定

李立新1, 司守霞2, 魏安智1, 刘玉林1, 冯世静1, 杨途熙1   

  1. 1. 西北农林科技大学, 陕西 杨凌 712100;
    2. 河南林业职业学院, 河南 洛阳 471002
  • 收稿日期:2017-08-16 出版日期:2017-10-28
  • 通讯作者: 杨途熙(1963-),男,陕西杨凌人,教授,硕士,主要从事林木遗传育种研究。
  • 作者简介:李立新(1990-),女,河北沧州人,在读硕士,主要从事林木遗传育种研究。
  • 基金资助:
    国家林业局林业公益性行业科研专项(201304706);西北农林科技大学产业技术集成与示范推广(TGZX2016-08);西北农林科技大学试验示范站(基地)科技成果推广专项(TGZX2015-46)

Study on Development of SSR Molecular Markers Based on Transcriptome Sequencing and Germplasm Identification in Zanthoxylum Germplasm

LI Lixin1, SI Shouxia2, WEI Anzhi1, LIU Yulin1, FENG Shijing1, YANG Tuxi1   

  1. 1. Northwest Agriculture and Forestry University, Yangling 712100, China;
    2. Henan Forestry Vocational College, Luoyang 471002, China
  • Received:2017-08-16 Published:2017-10-28

摘要: 为拓展分子标记在花椒种质资源分析中的应用、开发花椒EST-SSR功能性分子标记、分析花椒DNA指纹图谱,利用凤县大红袍花椒的茎尖节点转录组cDNA数据库中45 057条长度大于200 bp的非冗余Unigene序列,使用MIcroSAtellite(MISA)软件搜索SSR位点,分析花椒cDNA序列中SSR位点的频率和密度、SSR重复基元种类及比例、SSR重复次数与数量等分布特征;用Primer 3.0软件在线设计SSR引物并经PCR扩增筛选适合的多态性引物;用Quantity One软件统计多态性条带和分子量大小;NTsys 2.0软件分析12份花椒种质的遗传距离、构建树状聚类图及DNA指纹图谱库。结果表明,45 057条序列中有3 315条Unigene序列包含SSR位点,共3 814个,3 315条序列中SSR位点出现频率为7.07%;在检索出的SSR位点中,二核苷酸、三核苷酸是主要重复类型,分别占29.42%和58.58%,二核苷酸重复中以AG/TC、CT/GA出现频率最高,三核苷酸重复中GAA/CTT、AGA/TCT出现频率最高;二、三、四、五、六核苷酸重复基元总数随着重复次数的增加呈明显下降趋势。利用Primer 3.0设计的64对EST-SSR引物中,55对引物能产生预期片段大小的PCR产物,其中18对引物具有多态性;利用18对引物对12份花椒种质进行PCR扩增,共产生81条扩增条带,其中多态性条带73条,多态率为90.12%;各花椒种质的遗传相似系数为0.552 6~0.894 7,平均为0.725 0;经UPGMA聚类分析在相似系数0.70处12份花椒种质共分为3类,即顶坛花椒为Ⅰ类、竹叶椒为Ⅱ类、其他花椒为Ⅲ类;指纹图谱分析中,8对引物在5份种质中能扩增出特征带型,最少用3对引物进行组合即可将12份花椒种质区分开。成功在凤县大红袍花椒的茎尖节点转录组cDNA序列中开发SSR标记,设计并筛选出8对能扩增出特征带型的引物,最少用3对引物进行组合即可将12份花椒种质区分开,这为今后花椒遗传多样性分析、遗传图谱构建等方面提供新的引物序列并奠定了基础。

关键词: 花椒, EST-SSR, 引物开发, 指纹图谱

Abstract: To improve the application of molecular markers in the Zanthoxylum genus,the stuty developed functional EST-SSR markers and analyzed DNA fingerprint of Zanthoxylum germplasm.Microsatellite software was used to scan the SSR loci from 45 057 non-redundant Unigenes among length above 200 bp derived from the node tissue of stem tip transcriptome sequences of Zanthoxylum bungeanum Maxim Fengxiandahongpao. Then the frequency and density of SSR loci,the type and proportion of SSR motifs and the number of SSR repetitions were also analysed. The SSR primers were then designed by Primer 3.0 online and polymorphic primer were screened by PCR;the polymorphic bands and molecular size were evaluated by using Quantity One software;the genetic distance and clustering map were analyzed by using software NTsys 2.0 and then constructed Fingerprints by Quantity One. The results showed that 3 315 Unigene sequences contained a total of 3 814 SSR loci(7.07%) and the dinucleotide repeat and trinucleotide repeat were the main types and accounted for 29.42% and 58.58% of the total SSRs,respectively. Among dinucleotides,AG/TC and CT/GA were the most frequent repeats;among trinucleotides,GAA/CTT and AGA/TCT appeared high frequency;with the increased of the number of repetition,the total number of repeat motifs showed a clear downward trend. 64 pairs of SSR primers were designed and 55 primer pairs were successfully amplifying DNA fragments. Out of 55 primer pairs,18 pairs of polymorphic primer were used for PCR amplification in 12 Zanthoxylum germplasm. A total of 81 clear bands were amplified and the percentage of polymorphic bands was 90.12%.Genetic similarity coefficients of each Zanthoxylum germplasm among 0.552 6-0.894 7,with an average of 0.725 0. The UPGMA clustering showed that all the Zanthoxylum germplasm was divided into three main groups at the similarity coefficient 0.70:(Ⅰ) Zanthoxylum armatum DC,(Ⅱ) Zanthoxylum bungeanum Maxim,and (Ⅲ) Zanthoxylum planispinum var. dingtanensis;In the fingerprint analysis,8 pairs of primers could amplify characteristic bands on 5 Zanthoxylum germplasms and 3 pairs of primers could be used to separate the 12 Zanthoxylum germplasm at least. We successfully developed SSR markers in the node tissue of stem tip transcriptome sequences of Zanthoxylum bungeanum Maxim Fengxiandahongpao. 8 pairs of primers could amplify characteristic bands were designed and screened,a minimum of 3 pairs of primers could be used to separate 12 pepper cultivars,these new EST-SSR markers from Zanthoxylum germplasm provided a new primer sequence,basis for genetic analysis and fingerprint construction of Zanthoxylum germplasm.

Key words: Zanthoxylum bungeanum Maxim, EST-SSR, Primer development, Fingerprint

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引用本文

李立新, 司守霞, 魏安智, 刘玉林, 冯世静, 杨途熙. 基于花椒转录组序列SSR分子标记开发及花椒种质鉴定[J]. 华北农学报, 2017, 32(5): 69-77. doi: 10.7668/hbnxb.2017.05.011.

LI Lixin, SI Shouxia, WEI Anzhi, LIU Yulin, FENG Shijing, YANG Tuxi. Study on Development of SSR Molecular Markers Based on Transcriptome Sequencing and Germplasm Identification in Zanthoxylum Germplasm[J]. ACTA AGRICULTURAE BOREALI-SINICA, 2017, 32(5): 69-77. doi: 10.7668/hbnxb.2017.05.011.

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