Identification and genomic characterization of a novel polymycovirus from Alternaria alternata causing watermelon leaf blight
文献类型： 外文期刊
作者： Ma, Guoping 1 ; Wu, Chunyan 1 ; Li, Yuting 1 ; Mi, Yiran 1 ; Zhou, Tao 1 ; Zhao, Can 1 ; Wu, Xuehong 1 ;
作者机构： 1.China Agr Univ, Coll Plant Protect, 2 Yuanmingyuan West Rd, Beijing 100193, Peoples R China
2.Shandong Acad Agr Sci, Inst Plant Protect, Shandong Key Lab Plant Virol, Jinan 250100, Shandong, Peoples R China
3.China Agr Univ, Coll Hort, Beijing 100193, Peoples R China
期刊名称：ARCHIVES OF VIROLOGY （ 影响因子：2.574； 五年影响因子：2.466 ）
ISSN： 0304-8608
年卷期：
页码：
收录情况： SCI
摘要： A double-stranded RNA (dsRNA) mycovirus from the phytopathogenic fungus Alternaria alternata, which causes watermelon leaf blight, was characterized. The genome of this virus has eight dsRNA segments, ranging from 1039 bp to 2398 bp. DsRNAs 1-6 each contain a single large open reading frame (ORF), while dsRNAs 7 and 8 each dsRNA contain two ORFs. The RNA-dependent RNA polymerase (RdRp) encoded by dsRNA1 and the viral methyltransferase encoded by dsRNA3 share 97.6% and 98.9% amino acid sequence identity, respectively, with the corresponding proteins of Plasmopara viticola lesion associated polymycovirus 1. The dsRNA5-encoded proline-alanine-serine-rich protein shows 48.1% sequence identity to that of Beauveria bassiana polymycovirus 3. The proteins encoded on dsRNAs 2, 4, and 8 have 99.7%, 98.2%, and 65.1% sequence identity, respectively, to the corresponding proteins of a mycovirus identified in Alternaria sp. FA0703 (AltR1). The proteins encoded by dsRNAs 6 and 7 do not match any known proteins of mycoviruses. Phylogenetic analysis of the RdRp domain showed that the virus clustered with members of the family Polymycoviridae. Based on these characteristics, the mycovirus was identified as a polymycovirus and designated as "Alternaria alternata polymycovirus 1" (AaPmV1). This is the first report of a polymycovirus associated with A. alternata.
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