A new filamentous virus in shallot

Serological analysis (ELISA, immunoblotting, and immunoelectron microscopy) of the partially purified virus preparations obtained from shallot plants (selection sample no. 83) inoculated with the Mongolian isolate of onion yellow dwarf potyvirus (OYDV) revealed neither an OYDV coat protein antigen nor virions decorated by the corresponding antiserum. At the same time, these preparations contained many flexuous filamentous virus particles (FFVP) with a modal length of 780 nm. It is suggested that shallot no. 83 is resistant at least to the Mongolian isolate of OYDV, while the discovered FFVPs are the virions of some other viral agent. The nature and origin of a new virus are now under study in this laboratory