Carroll J E, Smith D M, Gray S M
New York State IPM Program and Section of Plant Pathology and Plant Microbe Biology, Cornell University, 630 W. North St., Geneva, NY 14456, USA.
Section of Plant Pathology and Plant-Microbe Biology, School of Plant Sciences, Cornell University, Ithaca, NY 14853, USA.
J Gen Virol. 2016 Mar;97(3):797-802. doi: 10.1099/jgv.0.000374. Epub 2015 Dec 16.
In the past decade, the incidence and distribution of the recombinant, tuber necrotic strain of Potato virus Y (PVYNTN) has been increasing in the US seed potato crop while the ordinary strain (PVYO) has been decreasing. The transmission efficiency of both strains was determined from two potato cultivars when acquired sequentially by the same aphid or when acquired by separate aphids and inoculated to the same plant. PVYNTN was transmitted more efficiently than PVYO and the order of acquisition or inoculation did not affect the preferential transmission of PVYNTN. When a recipient plant became infected with both strains, PVYNTN maintained higher titre than PVYO and would facilitate the acquisition of PVYNTN. Furthermore, the acquisition and transmission of PVYNTN over PVYO was enhanced in the potato cultivar that expressed a strain-specific Ny-like resistance gene that confers partial resistance to PVYO.
在过去十年中，重组马铃薯Y病毒坏死株系（PVYNTN）在美国种薯作物中的发病率和分布一直在增加，而普通株系（PVYO）则在减少。当由同一蚜虫依次获取或由不同蚜虫获取并接种到同一植株上时，测定了这两个株系在两个马铃薯品种中的传播效率。PVYNTN的传播效率高于PVYO，获取或接种顺序不影响PVYNTN的优先传播。当受体植物同时感染这两个株系时，PVYNTN的滴度高于PVYO，并会促进PVYNTN的获取。此外，在表达对PVYO具有部分抗性的株系特异性Ny样抗性基因的马铃薯品种中，PVYNTN相对于PVYO的获取和传播有所增强。
