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Tomato yellow vein streak virus and Tomato golden vein virus : a reappraisal of the classification status of two South American Begomovirus species based upon genome–wide pairwise identity of multiple isolates
Virus Genes ( IF 1.6 ) Pub Date : 2020-11-19 , DOI: 10.1007/s11262-020-01810-z
Luciane de Nazaré Almeida Dos Reis 1 , Leonardo S Boiteux 1, 2 , Maria Esther N Fonseca 2 , Rita de Cássia Pereira-Carvalho 1
Affiliation  

Tomato yellow vein streak virus (ToYVSV) and tomato golden vein virus (TGVV) are begomoviruses reported infecting tomatoes and other hosts across South America. However, their close phylogenetic relationship has generated uncertainties about their taxonomic status and nomenclature. In fact, genomic DNA–A identity levels of isolates reported with an identical virus name may range from 89–100%. In view of the potential inaccuracy regarding the classification status of these viruses (strains vs. distinct species), we carried out a comprehensive set of analyses employing all 45 available isolates with complete DNA–A sequences with either ToYVSV or TGVV designation. Two clear–cut clusters were identified and they were consistent with the current criteria for Begomovirus species demarcation. Moreover, our reappraisal confirmed a large array of misnamed isolates and recognized a distinctive set of virus species–specific genomic, biological, and ecological features. Hence, the present work gives support to the notion that these viruses are closely–related, but they are distinct and valid Begomovirus species. From the breeding standpoint, this information will be useful in guiding germplasm screening strategies searching for sources of large–spectrum resistance to isolates of both viruses.



中文翻译:

番茄黄脉条纹病毒和番茄金脉病毒:基于多个分离株的全基因组配对同一性重新评估两种南美 Begomovirus 物种的分类状态

番茄黄脉条纹病毒 (ToYVSV) 和番茄金脉病毒 (TGVV) 是据报道感染整个南美洲的番茄和其他宿主的 begomoviruses。然而,它们密切的系统发育关系导致了它们的分类地位和命名的不确定性。事实上,报告的具有相同病毒名称的分离株的基因组 DNA-A 同一性水平可能在 89-100% 之间。鉴于这些病毒(菌株与不同物种)的分类状态可能存在不准确之处,我们使用所有 45 种具有完整 DNA-A 序列且具有 ToYVSV 或 TGVV 名称的可用分离株进行了一组综合分析。确定了两个明确的集群,它们与Begomovirus的当前标准一致物种划分。此外,我们的重新评估确认了大量错误命名的分离株,并识别出一组独特的病毒物种特异性基因组、生物学和生态特征。因此,目前的工作支持这些病毒密切相关的观点,但它们是独特且有效的Begomovirus物种。从育种的角度来看,这些信息将有助于指导种质筛选策略,寻找对两种病毒分离株的大谱抗性来源。

更新日期:2020-11-19
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