Control plants (PLRV infected) (Fig. 4A; lane 1) and those agroinfiltrated with the empty vector (Fig. 4A; lane 2) showed rolling symptoms of PLRV infection in the upper leaves, whereas plants that were agroinfiltrated with the MP siRNA constructs (pART27-MP) did not show any symptoms of viral infection (Fig. 4A; lane 5). The gene discussed is PPP1CB; the disease is viral infectious disease.