Partial Characterization and Grouping of Isolates of Blackeye Cowpea Mosaic and Cowpea Aphidborne Mosaic Viruses

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Abstract
The biological, physical and some biochemical properties of single isolates of blackeye cowpea mosaic virus (BlCMV) from Florida and New York were compared with those of single isolates of cowpea aphid-borne mosaic virus (CAMV) from Cyprus, Morocco, Kenya and Nigeria. On the basis of reactions on selected cowpea lines, the 6 isolates were classified into the BlCMV or CAMV group. No common source of resistance was found for both CAMV and BlCMV, but cowpea lines with resistance to each virus group were identified. These resistant lines were used for differentiating the isolates as BlCMV or CAMV. The BlCMV group consisted of the Florida and New York isolates of BlCMV and the Kenya and Nigeria isolates of CAMV; the CAMV group included the Morocco and Cyprus isolates. In reciprocal cross-protection tests, neither the Kenya nor Florida isolates cross-protected against the Morocco isolate, and vice versa. The size of the capsid protein, the sedimentation rate of the nucleic acid and the length of the particles of the 6 isolates were very similar. The impact of this regrouping on the taxonomic status of BlCMV and CAMV is discussed.

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