Characterization of alphasatellites associated with monopartite begomovirus/betasatellite complexes in Yunnan, China

文献类型： 外文期刊

第一作者： Xie, Yan

作者： Xie, Yan;Wu, Peijun;Liu, Pei;Gong, Huanran;Zhou, Xueping

作者机构：

期刊名称：VIROLOGY JOURNAL （ 影响因子：4.099； 五年影响因子：3.719 ）

ISSN： 1743-422X

年卷期： 2010 年 7 卷

页码：

收录情况： SCI

摘要： Background: Alphasatellites are single-stranded molecules that are associated with monopartite begomovirus/betasatellite complexes. Results: Alphasatellites were identified in begomovirus-infected plant samples in Yunnan, China. All samples that contained alphasatellites also contained betasatellites, but only some samples that contained betasatellites contained alphasatellites. Thirty-three alphasatellites were sequenced, and they ranged from 1360 to 1376 nucleotides. All alphasatellites contain 3 conserved features: a single open reading frame (Rep), a conserved hairpin structure, and an adenine-rich (A-rich) region. On the basis of the phylogenetic tree of the complete nucleotide sequences, the alphasatellites were divided into 3 types with one exception. Type 1 was associated with Tomato yellow leaf curl China virus (TYLCCNV)/Tomato yellow leaf curl China betasatellite (TYLCCNB) complex. Type 2 was associated with Tobacco curly shoot virus (TbCSV)/Tobacco curly shoot betasatellite (TbCSB) complex. Type 3 was associated with TbCSV/Ageratum yellow vein betasatellite (AYVB) complex. Within each type, nucleotide sequence identity ranged from 83.4 to 99.7%, while 63.4-81.3% identity was found between types. Mixed infections of alphasatellites associated with begomovirus/betasatellite complexes were documented. Conclusions: Our results validate that alphasatellites are only associated with begomovirus/ betasatellite complexes. Thirty-three sequenced alphasatellites isolated from Yunnan Province, China were divided into 3 types-each associated with a specific begomovirus/betasatellite complex. Mix-infections of alphasatellite molecules may not be unusual.

分类号： Virology

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