Trans-Replication of, and Competition Between, DNA beta Satellites in Plants Inoculated with Tomato yellow leaf curl China virus and Tobacco curly shoot virus

文献类型： 外文期刊

第一作者： Qing, Ling

作者： Qing, Ling;Zhou, Xueping;Qing, Ling

作者机构：

期刊名称：PHYTOPATHOLOGY （ 影响因子：4.025； 五年影响因子：4.394 ）

ISSN： 0031-949X

年卷期： 2009 年 99 卷 6 期

页码：

收录情况： SCI

摘要： Tomato yellow leaf curl China virus (TYLCCNV) Y10 isolate (Y10) and Tobacco curly shoot virus (TbCSV) Y35 isolate (Y35), both obtained from Yunnan Province, were each found to be associated with a distinct species of satellite DNA (DNA beta). Here, we demonstrate that both Y10 DNA beta (Y10 beta) and Y35 DNA beta (Y35 beta) were stably trans-replicated by the noncognate Begomovirus, although the noncognate DNA beta accumulated in plants at a lower level than did the cognate DNA beta. In Nicotiana benthamiana and N. glutinosa plants agroinoculated with Y10+Y10 beta+Y35 beta or with Y35+Y35 beta+Y10 beta, all components accumulated in the early stages of infection but, at later stages, the noncognate DNA beta decreased in relative concentration and was undetectable at 80 to 120 days after inoculation. The helper viruses and cognate DNA beta species persisted at higher levels throughout the experiments. When the initiation codon of the beta C1 gene of the cognate DNA beta was mutated, the dominance of the cognate over the noncognate DNA beta in mixed infections was unimpaired. These results imply that the cognate DNA beta competes with the noncognate DNA beta and that the ability for selective maintenance of DNA beta is not controlled by the beta C1 protein.

分类号： Plant Sciences

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