A virus contaminating a culture of pea enation mosaic virus was isolated and studied. The virus, tentatively named pea symptomless virus (PSV), was not aphid-borne but was readily transmitted by sap inoculation of Amaranthaceae, Chenopodiaceae and Leguminosae. Purified preparationsl of PSV contained isometric particles 26 nm in diameter, which sedimented as three components with sedimentation coefficients of 55, 94 and 118S, respectively, and contained ribonucleic acid with a molar base content of G 22 %, A 26 %, C 17 %, U 34 %.PSV is a member of the cowpea mosaic group of plant viruses, is closely related to red clover mottle broad bean stain, and pea green mottle viruses, and protects plants against infection with red clover mottle virus. PSV, the viruses of broad bean stain, red clover mottle and pea green mottle, and possibly MF-virus, probably constitute a subgroup of the cowpea mosaic virus group and may even considered to be members of a single virus species.
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