DASHEEN MOSAIC VIRUS FROM THIRTEEN ARACEAE CROPS IN CHINA
我国13种天南星科作物上的芋花叶病毒

Dasheen mosaic virus( DMV) was detected from thirteen Araceae crops from Zhejiang province (Hangzhou, Lingbo, Fenghua and Wenzhou), Shanghai, Beijing, Fujian, Hunan province by using directly negative staining and ISEM Those crops are Colocasia esculenta, Amorphophallus sinesis as vegetable and food crops, Pinellia ternata, P. cordata, P. pedatisecta as Chineses medicienal crops, Zantedeschia aethiopica, Alocasia macrorrhiza, Colocasia gigantea, Syngonium podophyilum, S. podophyilum, Aglanonema modestum and Philodendron oxycadium as ornamental plants. DMV had strong positive reaction with both an antiserum of DMV and two antisera of PVY under imuno-specific electron microscope. Those DMV isolates from infected Araceae crops didn' t infect Nicotiana tobacum and other non-Araceae plants tested, but caused systemic symptoms when inoculated onto Araceae seedlings of Philodendron selloun, Pinelia ternata and P. cordata. The main length of DMV particles detected from natural infected crops is 752nm, and the main distribution of the particles is from 667 to 828nm. Tightly aggregated and loose distributed filamentous virus particles and cylindrical inclusion bodies were observed under ultra-thin sections of infected leaf tissue by DMV. The inclusion bodies consist with pinwheel, scroll-like structures and laminated aggregates simultaneously. The purified virus particles are characterized as typical potyvirus morphologically.The results indicate that dasheen mosaic virus is the main.pathogenic virus on Araceae crops in China Pillenia, Scindapsus and Syngonium are new hosts of DMV.