Synthesis and Characterization of a Full-Length Infectious cDNA Clone of Tomato Mottle Mosaic Virus

文献类型： 外文期刊

第一作者： Tu, Liqin

作者： Tu, Liqin;Gao, Danna;Zhu, Yuelin;Tu, Liqin;Wu, Shuhua;Ji, Yinghua;Liu, Yong

作者机构：

关键词： tomato mottle mosaic virus; full-length genome sequence; infectious cDNA clone; Agrobacterium-mediated inoculation; infectivity

期刊名称：VIRUSES-BASEL （ 影响因子：5.048； 五年影响因子：5.127 ）

ISSN：

年卷期： 2021 年 13 卷 6 期

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收录情况： SCI

摘要： Tomato mottle mosaic virus (ToMMV) is a noteworthy virus which belongs to the Virgaviridae family and causes serious economic losses in tomato. Here, we isolated and cloned the full-length genome of a ToMMV Chinese isolate (ToMMV-LN) from a naturally infected tomato (Solanum lycopersicum L.). Sequence analysis showed that ToMMV-LN contains 6399 nucleotides (nts) and is most closely related to a ToMMV Mexican isolate with a sequence identity of 99.48%. Next, an infectious cDNA clone of ToMMV was constructed by a homologous recombination approach. Both the model host N. benthamiana and the natural hosts tomato and pepper developed severe symptoms upon agroinfiltration with pToMMV, which had a strong infectivity. Electron micrographs indicated that a large number of rigid rod-shaped ToMMV virions were observed from the agroinfiltrated N. benthamiana leaves. Finally, our results also confirmed that tomato plants inoculated with pToMMV led to a high infection rate of 100% in 4-5 weeks post-infiltration (wpi), while pepper plants inoculated with pToMMV led to an infection rate of 40-47% in 4-5 wpi. This is the first report of the development of a full-length infectious cDNA clone of ToMMV. We believe that this infectious clone will enable further studies of ToMMV genes function, pathogenicity and virus-host interaction.

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