A novel hexa-segmented dsRNA mycovirus confers hypovirulence in the phytopathogenic fungus Diaporthe pseudophoenicicola
文献类型： 外文期刊
作者： Xu, Gang 1 ; Zhang, Xinchun 3 ; Liang, Xiaofei 4 ; Chen, Daipeng 1 ; Xie, Changping 1 ; Kang, Zhensheng 4 ; Zheng, Li 1 ;
作者机构： 1.Hainan Univ, Key Lab Green Prevent & Control Trop Plant Dis &, Minist Educ, Haikou 570228, Hainan, Peoples R China
2.Hainan Univ, Sch Plant Protect, Haikou 570228, Hainan, Peoples R China
3.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Hainan, Peoples R China
4.Northwest A&F Univ, State Key Lab Crop Stress Biol Arid Areas, Yangling 712100, Shaanxi, Peoples R China
5.Northwest A&F Univ, Coll Plant Protect, Yangling 712100, Shaanxi, Peoples R China
期刊名称：ENVIRONMENTAL MICROBIOLOGY （ 影响因子：5.476； 五年影响因子：6.82 ）
ISSN： 1462-2912
年卷期：
页码：
收录情况： SCI
摘要： A novel hexa-segmented double-stranded RNA (dsRNA) mycovirus was isolated and characterized from the filamentous phytopathogenic fungus Diaporthe pseudophoenicicola and was named Diaporthe pseudophoenicicola chrysovirus 1 (DpCV1). The full-length cDNAs of dsRNA1-6 were 3335, 3030, 3039, 2980, 963, and 780 bp, respectively. Sequence analysis indicated the presence of nine open reading frames (ORFs) in the DpCV1 genome. ORF1 in dsRNA1 putatively encoded the RNA-dependent RNA polymerase (RdRp) and ORF3 in dsRNA2 encoded a capsid protein (CP). The seven remaining ORFs, ORF2 in dsRNA2, ORF4 in dsRNA3, ORF6, seven in dsRNA4, ORF8 in dsRNA5, and ORF9 in dsRNA6, encoded proteins with unknown functions. Phylogenetic analysis revealed that DpCV1 is closely related to members of the cluster I group within the family Chrysoviridae but formed a separate clade. Importantly, all the six segments of DpCV1 were cured successfully through single spore isolation to obtain the isogenic virus-free strains. DpCV1 can confer hypovirulence to the fungal host of Diaporthe pseudophoenicicola. Compared with the virus-free strain, WC02 harbouring the DpCV1 is more sensitive to fungicide prochloraz. Furthermore, the cell wall of DpCV1 infected strain was loose and enlarged. This is the first report of a hexa-segmented tentative chrysovirus in D. pseudophoenicicola.
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