Host recovery and reduced virus level in the upper leaves after Potato virus Y infection occur in tobacco and tomato but not in potato plants.

In plants infected with PVY N:O -Mb55, PVY N:O -Mb58 and PVY N , a clear trend of symptom-severity attenuation based on veinal and petiole necrosis occurred in the more latterly emerged leaves ( Figure 3 A).

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