Abstract
Leaf samples were collected from wheat, barley, oat and rice plants infected with wheat yellow mosaic virus (WYMV) or wheat spindle streak mosaic virus (WSSMV), barley yellow mosaic virus (BYMV), oat mosaic virus (OMV) and rice necrosis mosaic virus (RNMV), respectively, and leaf cells were examined under an electron microscope. Complex membranous bodies, and pinwheel or cylindrical inclusions were developed in the cytoplasm of leaf cells infected with each of these viruses except OMV. OMV produced pinwheel inclusions, but no membranous bodies. Pinwheel inclusions in host cells infected with each of other four viruses than OMV were composed of single-layered plates 11-13nm in thickness. Plates in the OMV infected cells showed 3 layers 9-11nm in thickness. These facts indicate a close relationship among WYMV, WSSMV, BYMV and RNMV. OMV may be rather distantly related to them.
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