Efficient virus-induced gene silencing in plants using a modified geminivirus DNA1 component

文献类型： 外文期刊

第一作者： Huang, Changjun

作者： Huang, Changjun;Xie, Yan;Zhou, Xueping

作者机构：

关键词： DNA1;geminivirus;vector;virus-induced gene silencing

期刊名称：PLANT BIOTECHNOLOGY JOURNAL （ 影响因子：9.803； 五年影响因子：9.555 ）

ISSN： 1467-7644

年卷期： 2009 年 7 卷 3 期

页码：

收录情况： SCI

摘要： Virus-induced gene silencing (VIGS) is currently recognized as a powerful reverse genetics tool for application in functional genomics. DNA1, a satellite-like and single-stranded DNA molecule associated with begomoviruses (Family Geminiviridae), has been shown to replicate autonomously but requires the helper virus for its dissemination. We developed a VIGS vector based on the DNA1 component of tobacco curly shoot virus (TbCSV), a monopartite begomovirus, by inserting a multiple cloning site between the replication-associated protein open reading frame and the A-rich region for subsequent insertion of DNA fragments of genes targeted for silencing. When a host gene (sulphur, Su) or transgene (green fluorescent protein, GFP) was inserted into the modified DNA1 vector and co-agroinoculated with TbCSV, efficient silencing of the cognate gene was observed in Nicotiana benthamiana plants. More interestingly, we demonstrated that this modified DNA1 could effectively suppress GFP in transgenic N. benthamiana or endogenous Su in tobacco plants when co-agroinoculated with tomato yellow leaf curl China virus (TYLCCNV), another monopartite begomovirus that does not induce any viral symptoms. A gene-silencing system in Nicotiana spp., Solanum lycopersicum and Petunia hybrida plants was then established using TYLCCNV and the modified DNA1 vector. The system can be used to silence genes involved in meristem and flower development. The modified DNA1 vector was used to silence the AtTOM homologous genes (NbTOM1 and NbTOM3) in N. benthamiana. Silencing of NbTOM1 or NbTOM3 can reduce tobamovirus multiplication to a lower level, and silencing of both genes simultaneously can completely inhibit tobamovirus multiplication. Previous studies have reported that DNA1 is associated with both monopartite and bipartite begomoviruses, as well as curtoviruses. This vector system can therefore be applied for the study, analysis and discovery of gene function in a variety of important crop plants.

分类号： Biotechnology & Applied Microbiology; Plant Sciences

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