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Random Plant Viral Variants Attain Temporal Advantages During Systemic Infections and in Turn Resist other Variants of the Same Virus

文献类型： 外文期刊

作者： Zhang, Xiao-Feng 1 ; Guo, Jiangbo 1 ; Zhang, Xiuchun 1 ; Meulia, Tea 1 ; Paul, Pierce 1 ; Madden, Laurence V. 1 ; Li, 1 ;

作者机构： 1.Ohio State Univ, Dept Plant Pathol, Ohio Agr Res & Dev Ctr, Wooster, OH 44691 USA

2.China Agr Univ, State Key Lab Agro Biotechnol, Coll Biol Sci, Beijing 100193, Peoples R China

3.Inner Mongolia Univ Sci & Technol, Sch Math Phys & Biol Engn, Qingshan, Baotou, Peoples R China

4.CATAS, ITBB, Key Lab Biol & Genet Resources Trop Crops, Haikou 571101, Peoples R China

5.Ohio State Univ, Mol & Cellular Imaging Ctr, Ohio Agr Res & Dev Ctr,

期刊名称：SCIENTIFIC REPORTS （ 影响因子：4.379； 五年影响因子：5.133 ）

ISSN： 2045-2322

年卷期： 2015 年 5 卷

页码：

收录情况： SCI

摘要： Infection of plants with viruses containing multiple variants frequently leads to dominance by a few random variants in the systemically infected leaves (SLs), for which a plausible explanation is lacking. We show here that SL dominance by a given viral variant is adequately explained by its fortuitous lead in systemic spread, coupled with its resistance to superinfection by other variants. We analyzed the fate of a multi-variant turnip crinkle virus (TCV) population in Arabidopsis and N. benthamiana plants. Both wild-type and RNA silencing-defective plants displayed a similar pattern of random dominance by a few variant genotypes, thus discounting a prominent role for RNA silencing. When introduced to plants sequentially as two subpopulations, a twelve-hour head-start was sufficient for the first set to dominate. Finally, SLs of TCV-infected plants became highly resistant to secondary invasions of another TCV variant. We propose that random distribution of variant foci on inoculated leaves allows different variants to lead systemic movement in different plants. The leading variants then colonize large areas of SLs, and resist the superinfection of lagging variants in the same areas. In conclusion, superinfection resistance is the primary driver of random enrichment of viral variants in systemically infected plants.

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