Abstract
Lines of potato cv. Pito transformed with the P1 gene ofPotato virus Y (PVYo) in sense or antisense orientation were evaluated for resistance to PVY in the field in 1997 and 1998. The transgenic resistance fully protected the crop from infection with PVYo transmitted by aphids in both years. These plants were not resistant to the field isolates of the PVYN strain group, which is in agreement with our greenhouse experiments. Consequently, several transgenic lines produced higher yields than the nontransgenic cv. Pito plants. These results showed that the P1 gene-mediated resistance provides significant benefits under conditions were the incidence of infections and damage by PVYo are considerable.
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