Inclusion bodies of bean yellow mosaic virus, some less known closely related viruses and beet mosaic virus

Abstract

A modified simple staining technique readily demonstrated inclusion bodies in cytoplasm and nucleoli. Large amounts of cytoplasmic granular inclusions and abnormal nucleoli were observed with bean yellow mosaic virus. One isolate caused nucleoli to sprout like yeast. With a related pea virus nucleoli were much enlarged and usually covered with radiating crystalline needles. Inclusions produced by clover yellow vein virus were like those of bean yellow mosaic virus but nucleoli were very much enlarged. With beet mosaic virus, granular cytoplasmic inclusions and enlarged and sprouting nucleoli were observed.