%0 Journal Article %T The Helper Component-Proteinase ofSweet potato feathery mottle virusFacilitates Systemic Spread ofPotato virus XinIpomoea nil %A Sonoda, S. %A Koiwa, H. %A Kanda, K. %A Kato, H. %A Shimono, M. %A Nishiguchi, M. %A , %J Phytopathology %@ 0031-949X %D 2000-09-01 %I Scientific Societies %~ DeepDyve