Rännäli M, Czekaj V, Jones R A C, Fletcher J D, Davis R I, Mu L, Valkonen J P T
Department of Applied Biology, PO Box 27, FIN-00014 University of Helsinki, Finland.
Agricultural Research Western Australia, Locked Bag No. 4, Bentley Delivery Centre, Perth, WA 6983, and West Australian State Agricultural Biotechnology Centre, Murdoch University, Perth, WA 6150.
Plant Dis. 2009 Sep;93(9):933-939. doi: 10.1094/PDIS-93-9-0933.
Strains of Sweet potato feathery mottle virus (SPFMV; Potyvirus; Potyviridae) infecting sweet-potato (Ipomoea batatas) in Oceania, one of the worlds' earliest sweetpotato-growing areas, and in southern Africa were isolated and characterized phylogenetically by analysis of the coat protein (CP) encoding sequences. Sweetpotato plants from Easter Island were co-infected with SPFMV strains C and EA. The EA strain isolates from this isolated location were related phylogenetically to those from Peru and East Africa. Sweetpotato plants from French Polynesia (Tahiti, Tubuai, and Moorea) were co-infected with SPFMV strains C, O, and RC in different combinations, whereas strains C and RC were detected in New Zealand. Sweetpotato plants from Zimbabwe were infected with strains C and EA and those from Cape Town, South Africa, with strains C, O, and RC. Co-infections with SPFMV strains and Sweet potato virus G (Potyvirus) were common and, additionally, Sweet potato chlorotic fleck virus (Carlavirus) was detected in a sample from Tahiti. Taken together, occurrence of different SPFMV strains was established for the first time in Easter Island, French Polynesia, and New Zealand, and new strains were detected in Zimbabwe and the southernmost part of South Africa. These results from the Southern hemisphere reflect the anticipated global distribution of strains C, O, and RC but reveal a wider distribution of strain EA than was known previously.
在世界上最早种植甘薯的地区之一大洋洲以及南部非洲，对感染甘薯（Ipomoea batatas）的甘薯羽状斑驳病毒（SPFMV；马铃薯Y病毒属；马铃薯Y病毒科）毒株进行了分离，并通过分析外壳蛋白（CP）编码序列进行了系统发育特征分析。来自复活节岛的甘薯植株同时感染了SPFMV毒株C和EA。从这个孤立地点分离出的EA毒株在系统发育上与来自秘鲁和东非的毒株相关。来自法属波利尼西亚（塔希提岛、土布艾岛和莫雷阿岛）的甘薯植株以不同组合同时感染了SPFMV毒株C、O和RC，而在新西兰检测到了毒株C和RC。来自津巴布韦的甘薯植株感染了毒株C和EA，来自南非开普敦的植株感染了毒株C、O和RC。SPFMV毒株与甘薯病毒G（马铃薯Y病毒属）的共同感染很常见，此外，在一份来自塔希提岛的样本中检测到了甘薯褪绿斑点病毒（香石竹潜隐病毒属）。综上所述，首次在复活节岛、法属波利尼西亚和新西兰确定了不同SPFMV毒株的存在，并且在津巴布韦和南非最南端检测到了新的毒株。南半球的这些结果反映了毒株C、O和RC预期的全球分布，但显示出毒株EA的分布比以前所知的更广泛。
