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Characterization of DNA beta associated with begomoviruses in China and evidence for co-evolution with their cognate viral DNA-A

文献类型： 外文期刊

作者： Zhou, XP 1 ; Xie, Y 2 ; Tao, XR 2 ; Zhang, ZK 2 ; Li, ZH 2 ; Fauquet, CM 2 ;

作者机构： 1.Zhejiang Univ, Inst Biotechnol, Hangzhou 310029, Peoples R China

2.Zhejiang Univ, Inst Biotechnol, Hangzhou 310029, Peoples R China; Yunnan Acad Agr Sci, Yunnan Biotechnol Res Inst, Kunming 650223, Peoples R China; Danforth Plant Sci Ctr, Int Lab Trop Agr Biotechnol, St Louis, MO 63132 USA

关键词： Yellow vein disease;Leaf curl virus;Geminivirus replication;2 strains;New-delhi;Identification;Recombination;Sequence;Protein;Specificity

期刊名称：JOURNAL OF GENERAL VIROLOGY （ 影响因子：3.891； 五年影响因子：3.719 ）

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收录情况： SCI

摘要： Eighteen samples of begonnoviruses isolated from tobacco, tomato and weed species in Yunnan, China were found to be associated with DNAbeta molecules, for which the complete nucleoticle sequences were found to contain 1333-1355 nt. The 18 DNAbeta molecules identified consist of three main types, each associated with a different begonnovirus species: 72-99 % nucleoticle identity was found within one type, but only 39-57 % identity was found between types. All the DNAbeta molecules reported here and elsewhere contain a 115 nt conserved region that has 93-100 % identity with a consensus sequence, and have a common ORF encoding 118 amino acids on the complementary strand (designated Cl). Co-agroinoculation of the DNA-A component of Tomato yellow leaf curl China virus tobacco isolate Y10, with its associated DNAbeta (Y10beta), shows this DNAbeta to be involved in symptom induction in tobacco and tomato. The in-frame ATG mutation of C1 of Y10beta caused much milder symptoms as compared with wild Y10beta, indicating a functional role for this ORF. Pairwise nucleoticle sequence identity comparisons of DNAbeta molecules and their cognate viral DNA-A molecules indicate that DNAbeta molecules have co-evolved with their cognate helper viruses. Recombination between DNAbeta molecules is documented and a DNAbeta species concept is proposed and discussed. [References: 19]

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