中国农业科学 ›› 2017, Vol. 50 ›› Issue (20): 4046-4054.doi: 10.3864/j.issn.0578-1752.2017.20.019

• 研究简报 • 上一篇    

番红花种球中虎眼万年青花叶病毒的分子鉴定与序列分析

廖富荣1,林武镇1, 2,陈细红 1,3,陈青1,陈红运1,黄蓬英1,方志鹏1,吴媛1,沈建国3,林石明1

 
  

  1. 1厦门出入境检验检疫局检验检疫技术中心,福建厦门 3610262生物农药与化学生物学教育部重点实验室,福州 3500023福建出入境检验检疫局检验检疫技术中心,福州 350003
  • 收稿日期:2017-05-02 出版日期:2017-10-16 发布日期:2017-10-16
  • 通讯作者: 林石明,Tel:0592-6803996;E-mail:smlink@163.com
  • 作者简介:廖富荣,Tel:0592-6806943;E-mail:lfr005@163.com。
  • 基金资助:
    福建省自然科学基金(2015J01148)、国家质量监督检验检疫总局科技计划(2015IK190)、厦门市科技计划(3502Z20154080)

Molecular identification and sequence analysis of Ornithogalum mosaic virus in saffron (Crocus sativus) corms

LIAO FuRong1, LIN WuZhen1,2, CHEN XiHong1,3, CHEN Qing1, CHEN HongYun1, HUANG PengYing1FANG ZhiPeng1, WU Yuan1, SHEN JianGuo3, LIN ShiMing1   

  1. 1Inspection and Quarantine Technology Center, Xiamen Entry-Exit Inspection and Quarantine Bureau, Xiamen 361026, Fujian; 2Key Laboratory of Biopesticide and Chemical Biology, Ministry of Education, Fuzhou 350002; 3Inspection and Quarantine Technology Center, Fujian Entry-Exit Inspection and Quarantine Bureau, Fuzhou 350003
  • Received:2017-05-02 Online:2017-10-16 Published:2017-10-16

摘要: 【目的】对一批荷兰进境番红花种球(Crocus sativus)进行病毒鉴定,以防止危险性病毒传入危害。【方法】根据已报道的马铃薯Y病毒科(Potyviridae)通用引物(Sprimer和M4T),采用RT-PCR方法对一批番红花种球样品进行检测,取其中一个RT-PCR产物进行克隆测序,利用GenBank上的基本局部比对搜索工具(Basic Local Alignment Search Tool,BLAST)和MEGA 6中的基于对数期望的多重序列比较(Multiple Sequence Comparison by Log-Expectation,MUSCLE)进行序列比对分析,并根据外壳蛋白基因(coat protein,CP)序列利用最大似然法(maximum likelihood method)进行系统发育分析。【结果】RT-PCR检测结果显示该批样品扩增到一条约1.7 kb的预期大小片段,说明该批番红花种球样品中存在Potyviridae科病毒。测序获得长度为1 666 bp的序列(命名为2677-NL),含有部分核内含体b基因(nuclear inclusion b,NIb)、完整的CP和3′端非编码区(3′-UTR),其核苷酸序列与虎眼万年青花叶病毒(Ornithogalum mosaic virus,OrMV)的SW3.3分离物具有最高序列一致性(99.6%),与OrMV参考基因组序列(Reference genomic sequences,RefSeq;NC_019409)的序列一致性为99.1%。该分离物的CP与6个OrMV印度分离物(JQ686722、JQ686720、JN692498、JN692497、JN692496、JF682235)的核苷酸和氨基酸序列一致性分别为71.5%—77.3%和65.7%—79.7%,与其他32个OrMV分离物的核苷酸和氨基酸序列一致性分别为77.9%—99.5%和82.9%—99.2%。基于CP进行的系统发育分析表明,OrMV可分为两个类群,而2677-NL与5个澳大利亚分离物(JQ807995、JQ807996、NC_019409、AF185964、AF185965)相聚成簇,表明其在系统发育关系上与OrMV澳大利亚分离物的亲缘关系最近。【结论】根据国际病毒分类委员会(ICTV)关于Potyviridae科病毒种类的分类标准,2677-NL为OrMV的一个分离物,证实该批番红花种球受到OrMV的侵染。这是世界上首次在番红花中发现OrMV的报道。

关键词: 虎眼万年青花叶病毒, 番红花, RT-PCR, 新寄主

Abstract: 【Objective】The objective of this study is to identify viruses in saffron (Crocus sativus) corms imported from the Netherlands and to prevent the entry of dangerous virus into China. 【Method】Using the Potyviridae universal primers (Sprimer and M4T), the saffron corms samples were detected by reverse transcription polymerase chain reaction (RT-PCR) assay. After cloning and sequencing of the RT-PCR products, the Basic Local Alignment Search Tool (BLAST) and Multiple Sequence Comparison by Log-Expectation (MUSCLE) methods were used for multiple sequence alignment. The maximum likelihood method was used to construct the phylogenetic tree according to the coat protein (CP) nucleotide sequences. 【Result】The about 1.7 kb RT-PCR products were amplified from the samples, indicating a member of Potyviridae virus was present in the samples of saffron corms. A sequence of 1 666 bp segments was obtained from a positive sample (designated 2677-NL) and it contained a portion of nuclear inclusion b gene (NIb), the complete CP and 3′ untranslated region (3′-UTR). This isolate shared the highest nucleotide sequence identity (99.6%) with the SW3.3 isolate of Ornithogalum mosaic virus (OrMV) and shared 99.1% nucleotide sequence identity with the Reference genomic sequences (RefSeq) of OrMV (GenBank accession number: NC_019409). Of those, the CP of the 2677-NL isolate shared 71.5%-77.3% and 65.7%-79.7% nucleotide and amino acid identities, respectively, with those of six OrMV isolates from India (GenBank accession number: JQ686722, JQ686720, JN692498, JN692497, JN692496 and JF682235) whereas 77.9%-99.5% and 82.9%-99.2%, respectively, with the other 32 OrMV isolates. Phylogenetic analysis based on the CP genes showed that the OrMV could be divided into two groups, in which 2677-NL was clustered together with five OrMV isolates from Australia (GenBank accession number: JQ807995, JQ807996, NC_019409, AF185964 and AF185965), suggesting these OrMV were highly homologous in the phylogenetic relationship. 【Conclusion】According to the species demarcation criteria of the family Potyviridae on the International Committee on Taxonomy (ICTV), the 2677-NL was an isolate of OrMV, and it showed that the saffron corms sample was infected by OrMV. this is the first report on OrMV infecting C. sativus in the world.

Key words: Ornithogalum mosaic virus, Crocus sativus, RT-PCR, new host