河南农业科学 ›› 2020, Vol. 49 ›› Issue (5): 15-30.DOI: 10.15933/j.cnki.1004-3268.2020.05.002

• 作物栽培·遗传育种 • 上一篇    下一篇

贵紫麦1号转录组EST-SSR标记发掘与应用

杨帅1,杨喜翠1,何方1,2,李鲁华1,2,李振华1,2,任明见1,2,徐如宏1,2   

  1. (1.贵州大学 农学院,贵州 贵阳 550025;2.国家小麦改良中心贵州分中心,贵州 贵阳 550025)
  • 收稿日期:2019-12-04 出版日期:2020-05-15 发布日期:2020-05-15
  • 通讯作者: 徐如宏(1970-),男,贵州平坝人,教授,主要从事小麦遗传育种与分子生物学研究。E-mail:xrhgz@163.com
  • 作者简介:杨帅(1995-),男,苗族,贵州印江人,在读硕士研究生,研究方向:小麦遗传育种与分子生物学。E-mail:1153600337@qq.com
  • 基金资助:
    国家自然科学基金项目(31660390);贵州省农业成果转化计划项目(黔科合成果[2016]4022号);国家“七大农作物育种”重点专项(2017YFD0100900)

Exploration and Application of EST-SSR Markers in Guizimai No.1 Transcriptome

YANG Shuai1,YANG Xicui1,HE Fang1,2,LI Luhua1,2,LI Zhenhua1,2,REN Mingjian1,2,XU Ruhong1,2   

  1. (1.Agricultural College,Guizhou University,Guiyang 550025,China;2.Guizhou Sub-center of National Wheat Improvement Center,Guiyang 550025,China)
  • Received:2019-12-04 Published:2020-05-15 Online:2020-05-15

摘要: 为了开发新的小麦分子标记,利用前期小麦品种贵紫麦1号的转录组测序结果,对所得序列进行EST-SSR(Expressed sequence tagssimple sequence repeat)标记开发,并对开发的标记进行了染色体定位、多态性筛选。结果表明, 在119 572条总Unigenes序列中得到8 749条含SSR位点的EST序列,占7.3%,平均每8.04 kb就会出现1个SSR;EST序列中SSR类型的分布特点为三核苷酸重复类型最多,而五、六核苷酸重复类型出现频次很少,单核苷酸重复以A/T出现频次最多,二核苷酸重复以AG/CT出现频次最多,三核苷酸重复以CCG/CGG出现频次最多;对含SSR位点的EST序列进行引物设计,成功设计出引物的序列有5 503条,占总EST序列的62.9%,从中筛选到341对有效性EST-SSR引物;以中国春为对照,利用16份中国春缺体-四体系材料对341对EST-SSR引物进行染色体定位,共定位153对引物、201个位点,涉及除3A、5A、3B、4B及1D外的16条染色体,其中5B染色体定位引物对最多,达23对;筛选出53对多态性EST-SSR引物,对52份小麦材料进行遗传多样性分析发现,其中18对EST-SSR引物可将52份小麦材料一一区分。

关键词: 紫色小麦, EST-SSR, 多态性筛选, 标记开发, 染色体定位, 遗传多样性

Abstract: In order to develop new wheat molecular markers,EST-SSR markers were developed based on the results of transcriptome sequencing of Guizimai No.1.The chromosome location,polymorphism of developed markers were studied.The results showed that 8 749 EST sequences containing SSR loci were obtained from 119 572 total unigenes sequences,accounting for 7.3%,with an average of 1 SSR per 8.04 kb.The distribution characteristic of SSR types in EST sequences was that the trinucleotide repeat was the most,and pentanucleotide and hexanucleotide repeats were less;A/T repeat was the most in the single nucleotide repeats,AG/CT repeat was the most in the dinucleotide repeats,and CCG/CGG repeat was the most in trinucleotide repeats. Primers were successfully designed for 5 503 EST sequences containing SSR loci,accounting for 62. 9% of the total EST sequences; 341 effective EST-SSR primer pairs were screened;341 EST-SSR primer pairs were located using 16 Chinese Spring nulli-tetrasome system materials,and 153 EST-SSR primer pairs were located in 201 loci,involving 16 chromosomes except 3A,5A,3B,4B and 1D,of which primer pairs were the most on 5B chromosome,up to 23 primer pairs; 53 polymorphic EST-SSR primer pairs were screened out, and genetic diversity analysis of 52 wheat germplasms showed that 18 EST-SSR primer pairs could distinguish 52 wheat germplasms one by one.

Key words: Purple wheat, EST-SSR, Polymorphism screening, Marker exploration, Chromosome location, Genetic diversity

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