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Interaction of Lucerne Transient Streak Virus and the Viroid-like RNA-2 of Solanum nodiflorum Mottle Virus

Scottish Crop Research Institute, Invergowrie, Dundee DD2 5DA, U.K.

The particles of two serologically unrelated viruses, Solanum nodiflorum mottle (SNMV) and lucerne transient streak (LTSV), contain linear single-stranded RNA-1 (mol. wt. approx. 1.4 x 10⁶), and linear and circular RNA molecules of mol. wt. approx. 1.2 x 10⁵ (RNA-2). SNMV RNA-2 is reported to be part of the virus genome, but LTSV RNA-2 is a satellite-like RNA which is not necessary for the replication of LTSV RNA-1 or for the production of virus particles. When inoculated alone, SNMV RNA-2 did not infect plants but when inoculated with LTSV RNA-1 it replicated, modified the symptoms induced by LTSV and was packaged in particles with the serological specificity of LTSV. Thus, SNMV RNA-2 behaves like a satellite RNA in its interactions with LTSV. LTSV cultures containing LTSV RNA-2 or SNMV RNA-2, or lacking RNA-2, were distinguishable by reactions in some plant species but their particles were indistinguishable serologically, in sedimentation rate and in buoyant density in CsCl.

Keywords: Lucerne transient streak virus, Solanum nodiflorum mottle virus, satellite RNA, viroid-like RNA

Received 21 March 1983; accepted 5 May 1983.