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RNA-dependent RNA polymerase 1 delays the accumulation of viroids in infected plants

文献类型： 外文期刊

作者： Li, Shuai 1 ; Zhang, Zhixiang 1 ; Zhou, Changyong 2 ; Li, Shifang 1 ;

作者机构： 1.Chinese Acad Agr Sci, Inst Plant Protect, State Key Lab Biol Plant Dis & Insect Pests, Beijing, Peoples R China

2.Southwest Univ, Chinese Acad Agr Sci, Citrus Res Inst, Chongqing, Peoples R China

3.Chinese Acad Trop Agr Sci, Environm & Plant Protect Inst, Haikou, Hainan, Peoples R China

关键词： RDR1; resistance; RNA silencing; SA; salicylic acid; tobacco; tomato; viroid

期刊名称：MOLECULAR PLANT PATHOLOGY （ 影响因子：5.663； 五年影响因子：5.626 ）

ISSN： 1464-6722

年卷期： 2021 年 22 卷 10 期

页码：

收录情况： SCI

摘要： RNA-dependent RNA polymerase 1 (RDR1) is essential for plant antiviral defence, but its role in plant defence against viroid infection remains unknown. The present study aimed to identify the function and mechanism of RDR1 in plant resistance to viroid infection. Overexpression of Nicotiana tabacum RDR1 (NtRDR1) delayed the accumulation of potato spindle tuber viroid (PSTVd) genomic RNA and PSTVd-derived small RNA (sRNA) in Nicotiana benthamiana plants at the early invasion stage, but not in the late stage of infection. Conversely, virus-induced gene silencing of tomato RDR1 (SlRDR1a) increased the susceptibility to PSTVd infection (increased viroid accumulation). Salicylic acid (SA) pretreatment induced SlRDR1a expression and enhanced the defence against PSTVd infection in tomato plants. Our study demonstrated that RDR1 is involved in SA-mediated defence and restricts the early systemic invasion by PSTVd in plants. The decreased PSTVd accumulation in N. benthamiana was not caused by efficient accumulation of PSTVd sRNAs. These results deepen our understanding of the mechanism of RDR1 in plant defence responses to viroid attack.

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