1887

Abstract

In the past decade, the incidence and distribution of the recombinant, tuber necrotic strain of Potato virus Y (PVY) has been increasing in the US seed potato crop while the ordinary strain (PVY) 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. PVY was transmitted more efficiently than PVY and the order of acquisition or inoculation did not affect the preferential transmission of PVY. When a recipient plant became infected with both strains, PVY maintained higher titre than PVY and would facilitate the acquisition of PVY. Furthermore, the acquisition and transmission of PVY over PVY was enhanced in the potato cultivar that expressed a strain-specific -like resistance gene that confers partial resistance to PVY.

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2016-03-01
2019-12-15
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