The Relationship Between Bean Yellow Mosaic Virus and Pea Mosaic Virus.

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Abstract
The host range, symptomatology, serology, and electron microscopy of 1 isolate of bean yellow mosaic virus (BYMV) and of 3 isolates of pea mosaic virus (PMV1, PMV2, and PMV3) were compared. All had similar host ranges, but could be differentiated by symptomatology. BYMV, PMVl, and PMV2 were closely related serologically. The normal particle length of PMVl was consistently in the range 787-800 m[mu], whereas with BYMV it varied according to the host plant. From legumes it was within the range 742-756 m[mu] and from Chenopodium amaranticolor 794-800 m[mu]. PMV2 and PMV3 had particles of similar length to PMVl. Morphological differences were observed between some particles of BYMV and PMVl from leguminous hosts, but not from C. amaranticolor. The pitfalls of using particle length measurements as a criterion of strain relationship are discussed. All the isolates should be regarded as strains of BYMV.