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在中国从葫芦科叶斑病菌瓜类匍柄霉中分离出一种新型维克托病毒。

A novel victorivirus isolated from the tobacco spot blight fungus Stagonosporopsis cucurbitacearum in China.

作者信息

Yang Mengmeng, Wang Guiyao, Mu Wenjun, Guo Jianhua, Xi Jiaqin, Hu Liwei, Liang Kexin, Xu Qiang, Hu Zongyu, Song Jizhen

机构信息

Key Laboratory of Eco-environment and Leaf Tobacco Quality, Zhengzhou Tobacco Research Institute of CNTC, Zhengzhou, 450001, Henan, China.

China Tobacco Jiangsu Industry Co., Ltd, Nanjing, 210000, Jiangsu, China.

出版信息

Arch Virol. 2022 Dec;167(12):2845-2850. doi: 10.1007/s00705-022-05618-0. Epub 2022 Oct 10.

Abstract

Stagonosporopsis cucurbitacearum is an important plant-pathogenic fungus that causes stem and leaf blight diseases in a variety of crops. Here, we report the characterization of a novel victorivirus, tentatively named "Stagonosporopsis cucurbitacearum victorivirus 1" (ScVV-1), isolated from the S. cucurbitacearum isolate M-7. The ScVV-1 genome is 5,165 bp in length with a predicted GC content of 60.1% and contains two large open reading frames (ORF 1 and ORF2) encoding putative proteins that share significant sequence similarity with coat proteins (CPs) and RNA-dependent RNA polymerases (RdRps) of mycoviruses of the family Totiviridae. The ScVV-1 RdRp appears to be translated using a stop-initiation pentanucleotide UAAUG sequence. Phylogenetic analysis based on CP and RdRp amino acid (aa) sequences both indicated that ScVV-1 belongs to the genus Victorivirus in the family Totiviridae. To our knowledge, this is the first full-length genome sequence of a victorivirus infecting S. cucurbitacearum.

摘要

瓜类刺盘孢是一种重要的植物病原真菌,可导致多种作物发生茎枯病和叶枯病。在此,我们报告了从瓜类刺盘孢分离株M-7中分离出的一种新型病毒,暂命名为“瓜类刺盘孢病毒1”(ScVV-1)的特征。ScVV-1基因组长度为5165 bp,预测GC含量为60.1%,包含两个大的开放阅读框(ORF 1和ORF2),编码的假定蛋白与双链RNA病毒科真菌病毒的衣壳蛋白(CPs)和RNA依赖的RNA聚合酶(RdRps)具有显著的序列相似性。ScVV-1 RdRp似乎是利用终止起始五核苷酸UAAUG序列进行翻译的。基于CP和RdRp氨基酸(aa)序列的系统发育分析均表明,ScVV-1属于双链RNA病毒科中的病毒属。据我们所知,这是感染瓜类刺盘孢的病毒属病毒的首个全长基因组序列。

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