Department of Plant Biology and Forest Genetics, Box 7080, SLU, SE-750 07 Uppsala, Sweden.
Mol Plant Pathol. 2005 Mar 1;6(2):199-211. doi: 10.1111/j.1364-3703.2005.00267.x.
SUMMARY Sweetpotato (Ipomoea batatas) is a widely grown food crop, in which the most important diseases are caused by viruses. Genetic variability of three widely distributed sweetpotato viruses was analysed using data from 46 isolates of Sweet potato feathery mottle virus (SPFMV), 16 isolates of Sweet potato mild mottle virus (SPMMV) and 25 isolates of Sweet potato chlorotic stunt virus (SPCSV), of which 19, seven and six isolates, respectively, are newly characterized. Division of SPFMV into four genetic groups (strains) according to phylogenetic analysis of coat protein (CP) encoding sequences revealed that strain EA contained the East African isolates of SPFMV but none from elsewhere. In contrast, strain RC contained ten isolates from Australia, Africa, Asia and North America. Strain O contained six heterogeneous isolates from Africa, Asia and South America. The seven strain C isolates from Australia, Africa, Asia, and North and South America formed a group that was genetically distant from the other SPFMV strains. SPMMV isolates showed a high level of variability with no discrete strain groupings. SPCSV isolates from East Africa were phylogenetically distant to SPCSV isolates from elsewhere. Only from East Africa were adequate data available for different isolates of the three viruses to estimate the genetic variability of their local populations. The implications of the current sequence information and the need for more such information from most sweetpotato-growing regions of the world are discussed in relation to virus diagnostics and breeding for virus resistance.
摘要 番薯（Ipomoea batatas）是一种广泛种植的粮食作物，其中最重要的病害是由病毒引起的。利用 46 个甘薯羽状斑驳病毒（SPFMV）、16 个甘薯轻斑驳病毒（SPMMV）和 25 个甘薯黄脉病毒（SPCSV）的分离物的数据分析了这三种广泛分布的甘薯病毒的遗传变异，其中 19、7 和 6 个分离物分别为新鉴定的。根据外壳蛋白（CP）编码序列的系统进化分析，将 SPFMV 分为 4 个遗传群（株系），结果表明，株系 EA 含有东非的 SPFMV 分离物，但没有其他地方的分离物。相比之下，株系 RC 含有来自澳大利亚、非洲、亚洲和北美的 10 个分离物。株系 O 含有来自非洲、亚洲和南美洲的 6 个异质分离物。来自澳大利亚、非洲、亚洲和北美及南美 7 个株系 C 的分离物形成一个与其他 SPFMV 株系遗传上有差异的群体。SPMMV 分离物表现出高度的变异性，没有离散的株系分组。来自东非的 SPCSV 分离物与其他地方的 SPCSV 分离物在系统进化上相距甚远。只有来自东非的三个病毒的不同分离物才有足够的数据来估计其当地种群的遗传变异。目前序列信息的意义以及从世界上大多数甘薯种植地区获得更多此类信息的必要性，在病毒诊断和抗病性育种方面进行了讨论。
