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High levels of resistance to Potato virus A (PVA, genus Potyvirus), indicated by absence of detectable infection in inoculated leaves, were attained in Nicotiana benthamiana transformed with a construct expressing the PVA 5'-untranslated region fused with the coat protein (CP)-encoding sequence. Low steady-state levels of the transgene transcripts were detected. Resistance was PVA-specific and did not protect the plants against infection with Potato virus Y (PVY, genus Potyvirus). Consequently, the steady-state levels of the CP-transgene mRNA were greatly elevated in the plants infected with PVY, and plants became susceptible to infection with PVA. These data show that virus resistance obtained by expressing regions of a plant virus genome in transgenic plants may be suppressed following infection with another virus that evades the virus-specific resistance.

Coat protein gene-mediated resistance to Potato virus A in transgenic plants is suppressed following infection with another potyvirus