Molecular identification and phylogenetic analysis of a viral RNA associated with the Chinese tobacco bushy top disease complex

文献类型： 外文期刊

第一作者： Mo, X-H

作者： Mo, X-H;Chen, J-P;Mo, X-H;Chen, J-P;Mo, X-H;Chen, Z-B

作者机构：

关键词： RNA polymerase: 9014-24-8;EC 2.7.7.6;viral RNA;open reading frame 1a: stop codon;molecular identification;BLAST

期刊名称：ANNALS OF APPLIED BIOLOGY （ 影响因子：2.75； 五年影响因子：2.942 ）

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年卷期：

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收录情况： SCI

摘要： Tobacco bushy top disease is caused by a complex of the viruses tobacco bushy top virus (TBTV, a member of the genus Umbravirus) and tobacco vein distorting virus (TVDV, a member of the genus Polerovirus), which acts as a helper virus encapsidating the TBTV genomic RNA. RNA from purified virions is separated as five bands. The two largest (6.0 and 4.2 kb) were shown by Northern blot analysis to be the genomic RNAs of TVDV and TBTV, respectively. A band of about 3 kb was cloned and sequenced and shown to be the RNA of a previously undescribed virus with two open reading frames (ORFs), the second of which is an RNA-dependent RNA polymerase (RdRp) and is probably expressed by readthrough of the ORF1a stop codon. BLAST and phylogenetic analyses of the RdRp show that it is related to two RNAs previously reported in association with the poleroviruses Beet western yellows virus and Carrot red leaf virus. These three RNAs appear to represent species of a new genus of plant viruses dependent upon a helper polerovirus for their transmission.

分类号： Q1-0

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