Abstract
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.
Highlights
Preferential acquisition and inoculation of PVYNTN over PVYO in potato by the green peach aphid Myzus persicae (Sulzer)
Further exacerbating the situation is the emergence of recombinant Potato virus Y (PVY) strains (e.g. PVYNTN) that induce tuber necrosis and attenuated foliar symptoms in many popular North American potato cultivars (Gray et al, 2010)
In the past ten years, PVYNTN has become widespread and incidence is increasing in US seed potato production areas, though it still only accounts for about 20 % of the total PVY incidence (Gray et al, 2010 and unpublished)
Summary
Preferential acquisition and inoculation of PVYNTN over PVYO in potato by the green peach aphid Myzus persicae (Sulzer). 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. Further exacerbating the situation is the emergence of recombinant PVY strains (e.g. PVYNTN) that induce tuber necrosis and attenuated foliar symptoms in many popular North American potato cultivars (Gray et al, 2010). The sequential acquisition experiments, designated O/NTN and NTN/O, used a single M. persicae given an AAP on a leaf infected with one strain and moved immediately to a leaf infected with the other strain for the second AAP before being placed on the recipient plant (Fig. 1). Source leaves and a subset of plants infected with PVYO and/or PVYNTN were tested by immunocapture multiplex reverse transcription (RT)PCR (Lorenzen et al, 2006)
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