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Full-length RNA sequencing reveals the mechanisms by which an TSWV-HCRV complex suppresses plant basal resistance

文献类型： 外文期刊

作者： Gui, Min 1 ; Hu, Huaran 2 ; Jia, Zhiqiang 1 ; Gao, Xue 3 ; Tao, Hongzheng 3 ; Li, Yongzhong 4 ; Liu, Yating 4 ;

作者机构： 1.Yunnan Agr Univ, Coll Plant Protect, Kunming, Peoples R China

2.Yunnan Acad Agr Sci, Hort Res Inst, Kunming, Peoples R China

3.Honghe Univ, Coll Life Sci & Technol, Mengzi, Peoples R China

4.Yunnan Agr Univ, Coll Tobacco, Kunming, Peoples R China

关键词： tomato spotted wilt orthotospovirus (TSWV); Hippeastrum chlorotic ringspot orthotospovirus (HCRV); co-infection mechanism; basal resistance; full-length transcriptome; miRNA

期刊名称：FRONTIERS IN PLANT SCIENCE （ 影响因子：5.6； 五年影响因子：6.8 ）

ISSN： 1664-462X

年卷期： 2023 年 14 卷

页码：

收录情况： SCI

摘要： Viruses deploy numerous strategies to infect plants, typically by forming complexes with another virus, leading to more efficient infection. However, the detailed plant responses to viral infection and the underlying mechanisms of co-infection remain unclear. Previously, we found that tomato spotted wilt orthotospovirus (TSWV) and Hippeastrum chlorotic ringspot orthotospovirus (HCRV) could infect plants in the field by forming a complex. In this study, we found that TSWV infected tobacco (Nicotiana benthamiana) plants in cooperation with HCRV, leading to a more efficient infection rate of both viruses. We then used the in-depth full-length transcriptome to analyze the responses of N. benthamiana to complex infection by TSWV-HCRV (TH). We found that infection with individual TSWV and HCRV triggered plant defense responses, including the jasmonic acid signaling pathway, autophagy, and secondary metabolism. However, TH co-infection could not trigger and even suppress some genes that are involved in these basal resistance responses, suggesting that co-infection is advantageous for the virus and not for the plants. Typically, the TH complex inhibits NbPR1 expression to suppress tobacco resistance. Moreover, the TH complex could alter the expression of microRNAs (miRNAs), especially novel-m0782-3p and miR1992-3p, which directly interact with NbSAM and NbWRKY6 and suppress their expression in tobacco, leading to downregulation of NbPR1 and loss of resistance in tobacco to TSWV and HCRV viruses. Overall, our results elucidated the co-infection mechanisms of TH in tobacco by deploying the miRNA of plants to suppress plant basal resistance and contributed to developing a novel strategy to control crop disease caused by this virus complex.

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