Abstract
The VRU strain of alfalfa mosaic virus (AMV) resembles most other strains of this virus in its biological properties, but purified preparations contained a considerable proportion of particles longer than bottom component. The nucleic acid content of the longer particles appeared to be similar to that of the normal AMV components, and no nucleic acid species larger than that normally associated with bottom component was detected. Fractions which consisted predominantly of longer particles were as infectious as unfractionated preparations. Therefore the longer particles must contain several RNA strands, and possibly the full complement of RNA species necessary for infection might be contained in a single particle. Reconstitution experiments indicated that the production of long particles was protein directed. It is suggested that the protein subunits of VRU strain of AMV have a greater propensity to aggregate as hexamers than pentamers.
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