文献类型： 外文期刊
作者： Han, Zhenhao 1 ; Jiang, Jingjing 1 ; Xu, Wenxing 1 ;
作者机构： 1.Huazhong Agr Univ, Natl Key Lab Germplasm Innovat Utilizat Hort Crops, Wuhan 430070, Peoples R China
2.Huazhong Agr Univ, Hubei Hongshan Lab, Wuhan, Peoples R China
3.Huazhong Agr Univ, Coll Plant Sci & Technol, Wuhan, Peoples R China
4.Key Lab Plant Pathol Hubei Prov, Wuhan, Peoples R China
5.Gansu Acad Agr Sci, Inst Plant Protect, Lanzhou, Peoples R China
关键词： dsRNA virus; mycovirus; polymycovirus; filamentous viral particle; viral morphologies; Pseudopestalotiopsis camelliae-sinensis polymycovirus 1
期刊名称：JOURNAL OF VIROLOGY （ 影响因子：3.8； 五年影响因子：3.9 ）
ISSN： 0022-538X
年卷期： 2025 年 99 卷 1 期
页码：
收录情况： SCI
摘要： Polymycoviridae is a relatively new viral family that was established nearly 5 years ago, but their viral morphologies (naked or encapsidated) remain controversial since only one member namely, Colletotrichum camelliae filamentous virus 1 (CcFV1), was identified as being encapsidated in filamentous virions. Here, three novel double-stranded RNA (dsRNA) viruses belonging to the family Polymycoviridae were identified in three phytopathogenic fungal strains and tentatively named Pseudopestalotiopsis camelliae-sinensis polymycovirus 1 (PcsPmV1), and Phyllosticta capitalensis polymycovirus 1 and 2 (PhcPmV1 and 2), respectively. PcsPmV1 and PhcPmVs have five or six genomic dsRNAs, ranging from 1,055 to 2,405 bp, encoding five or seven putative open reading frames (ORFs), of which ORF1 encodes an RNA-dependent RNA polymerase, ORF5 encodes a prolein-alanine-serine-rich (P-A-S-rich) protein behaving as coat protein (CP); and dsRNAs 4 and 6 encode putative proteins with unknown functions and share no detectable identities with known viral sequences. Upon examination under transmission electron microscopy after purification from fungal mycelia, PcsPmV1 and PhcPmVs were found to be encapsidated in filamentous particles, as was a known polymycovirus, Botryosphaeria dothidea RNA virus 1 (BdRV1), which was previously assumed to likely have no conventional virions. The morphology of PcsPmV1 was further supported by the observation that its particles could be decorated by polyclonal antibodies against its CP and bound by immuno-gold particles conjugated to the specific CP antibody. Together with CcFV1, BdRV1, PcsPmV1, and PhcPmVs, these provide strong evidence to support the notion that polymycoviruses are encapsidated in filamentous virions constituted by P-A-S-rich CPs. Moreover, their biological effects on their fungal hosts were assessed, suggesting that PcsPmV1 infection could enhance growth and virulence.
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