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Two transgenic potato clones of cv. Achat, denominated 1P and 63P were challenged with two Potato virus Y strains (PVY O and PVY N), under greenhouse conditions, to be evaluated for resistance to these strains. Optical density values of the Elisa readings of samples from the transgenic plants were compared to readings from samples of the inoculated non-transformed plants. Clone 1P was extremely resistant to both PVY strains, reflected by not being systemically infected. Clone 63P, however, presented partial resistance to both PVY strains as local or systemic infection was delayed in some days. These results confirm the previously reported extreme resistance to PVY of clone 1P. Dois clones transgênicos de batata, derivados da cv. Achat, denominados 1P e 63P foram desafiados com duas estirpes do Potato virus Y (PVY O PVY N), em condições de casa-de-vegetação, para avaliação do nível de resistência dos clones ao vírus. Os valores de densidade óptica das leituras dos testes de Elisa foram comparados a leituras dos clones não transformados e inoculados. O clone 1P apresentou extrema resistência a ambas as estirpes, não tendo sido observada infecção sistêmica nos dois ensaios. O Clone 63P apresentou resistência parcial às duas estirpes, refletida no retardo do aparecimento de infecções sistêmicas por duas semanas. Os resultados obtidos confirmam o alto nível de resistência do clone 1P, relatado anteriormente

Resistance levels to two strains of Potato virus Y (PVY) in transgenic potatoes cv. Achat