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Dendrobium viroid, a new monocot-infecting apscaviroid

文献类型： 外文期刊

作者： Yang, Yi 1 ; Xing, Fei 1 ; Li, Shuai 2 ; Che, Hai-Yan 1 ; Wu, Zhi-Gang 4 ; Candresse, Thierry 3 ; Li, Shi-Fang 1 ;

作者机构： 1.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou 571101, Hainan, Peoples R China

2.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pests, Beijing 100193, Peoples R China

3.Univ Bordeaux, UMR BFP, INRAE, Villenave Dornon 33140, France

4.Zhejiang Acad Agr Sci, Zhejiang Inst Subtrop Crops, Wenzhou, Peoples R China

关键词： Dendrobium; Monocotyledonous plant; Transcriptome shotgun assembly; Viroid; Infectivity

期刊名称：VIRUS RESEARCH （ 影响因子：3.303； 五年影响因子：3.445 ）

ISSN： 0168-1702

年卷期： 2020 年 282 卷

页码：

收录情况： SCI

摘要： Viroids are small circular RNA molecules which have been found to infect many dicot species. Only coconut cadang-cadang viroid and coconut tinangaja viroid have been reported so far to infect a monocot (coconut). Data mining in silico has proven an efficient approach to identify new viruses/viroids, and a systematic screen of public transcriptomic data revealed a 648 nucleotides (nt) sequence potentially representing a novel viroid-like RNA in a transcriptome shotgun assembly from Dendrobium officinale. This sequence contained two central conserved regions (CCRs) characteristic of members of the genus Apscaviroid, indicating that the viroid-like RNA is 324 nt in length. The infectivity of dimeric RNA transcripts generated by in vitro transcription of a synthetic cDNA, was demonstrated by directly injecting into the stems of young Dendrobium officinale plants. The presence of this novel viroid, tentatively designated as Dendrobium viroid (DVd), in the inoculated plants was confirmed by 2D-PAGE together with northern hybridization. DVd is predicted to have a rod-like secondary structure containing a CCR and a terminal conserved region (TCR), and phylogenetic analysis shows that it groups with the known members of the genus Apscaviroid. It is most closely related to citrus viroid V (56% nt identity). A field survey revealed a low DVd incidence (0.96%) in Dendrobium species in China. To our best knowledge, DVd is the only viroid known to infect orchids and the third one from monocotyledonous plants.

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