Wosula E N, Clark C A, Davis J A
Department of Plant Pathology and Crop Physiology.
Department of Entomology, Louisiana State University Agricultural Center, Baton Rouge 70803.
Plant Dis. 2012 Sep;96(9):1331-1336. doi: 10.1094/PDIS-11-11-0934-RE.
Sweetpotato feathery mottle virus (SPFMV) is a nonpersistently transmitted virus known to infect sweetpotato (Ipomoea batatas) and wild morning glory plants. SPFMV is vectored by various aphid species, among them the green peach aphid, Myzus persicae, and the cotton aphid, Aphis gossypii. Our objective was to determine whether differences in acquisition hosts (sweetpotato and morning glory), aphid species (M. persicae and A. gossypii), and infection status (single versus mixed infection) influenced transmission of SPFMV. SPFMV transmission from I. hederacea with a natural mixed infection by A. gossypii (39%) was significantly greater than in other host-virus combinations. Successful transmissions by A. gossypii were significantly greater compared with M. persicae in all host-virus combinations. Virus titers in source leaves were significantly greater in single- and mixed-infected I. hederacea and single-infected I. cordatotriloba compared with other host-virus combinations. There was a significant positive correlation between virus titer and transmission by both aphid species. These results suggest that, under controlled conditions, SPFMV is more readily transmitted from infected morning glory plants than from sweetpotato. Additionally, mixed-infected plants are better virus sources for transmission than single-infected, and A. gossypii is a more efficient vector than M. persicae under laboratory conditions.
甘薯羽状斑驳病毒（SPFMV）是一种非持久性传播病毒，已知可感染甘薯（Ipomoea batatas）和野生牵牛属植物。SPFMV由多种蚜虫传播，其中包括桃蚜（Myzus persicae）和棉蚜（Aphis gossypii）。我们的目的是确定获取宿主（甘薯和牵牛属植物）、蚜虫种类（桃蚜和棉蚜）以及感染状态（单一感染与混合感染）的差异是否会影响SPFMV的传播。棉蚜对自然混合感染的圆叶牵牛（I. hederacea）的SPFMV传播率（39%）显著高于其他宿主 - 病毒组合。在所有宿主 - 病毒组合中，棉蚜的成功传播率与桃蚜相比均显著更高。与其他宿主 - 病毒组合相比，单一感染和混合感染的圆叶牵牛以及单一感染的心叶牵牛（I. cordatotriloba）的源叶中的病毒滴度显著更高。两种蚜虫的病毒滴度与传播率之间均存在显著正相关。这些结果表明，在受控条件下（实验室条件），SPFMV从受感染的牵牛属植物传播比从甘薯传播更容易。此外，混合感染的植物比单一感染的植物是更好的病毒传播源，并且在实验室条件下棉蚜是比桃蚜更有效的传播媒介。
