Reference Report for SoyBase8101959
| Title: | Purification, partial characterization, and serology of blackeye cowpea mosaic virus |
| Authors: | Lima, J.A.A., Purcifull, D.E., Hiebert, E. |
| Source: | Phytopath. 1979, 69(12):1252-1258 |
| Abstract: | Blackeye cowpea mosaic virus (BlCMV) was increased in cowpea, Vigna unguiculata 'Knuckle Purple Hull', and infected leaves were used for purification of virus and cytoplasmic inclusion bodies. Either n-butanol or a combination of chloroform and carbon tetrachloride was used in the clarification process. Polyacrylamide gel electrophoresis of sodium dodecyl sulfate (SDS)-dissociated inclusions and virions revealed that the inclusions consisted of a single protein estimated to have a MW of about 70,000 whereas freshly purified BlCMV consisted of a main protein component with a MW and 2 smaller proteins with MW of 29,000 and 27,000. Purified BlCMV had a A260/A280 ratio of 1.2 and a modal length of 753 nm. Freshly purified BlCMV preparations showed a single sedimenting peak with s20 = 157-159S. Storage of purified BlCMV at 4.degree. C for more than 30 days resulted in a reduction of the virion S value, a reduction in the MW of the capsid protein, and a partial loss of antigenic determinants. The purified BlCMV cytoplasmic inclusions had absorption spectra characteristic for proteins. Antisera reactive in SDS-immunodiffusion were obtained against untreated virions, pyrrolidine-dissociated coat protein, and untreated BlCMV cytoplasmic inclusions. Double immunodiffusion tests (with SDS-treated antigens and antiserum to BlCMV) showed that the BlCMV is serologically unrelated to 6 potyviruses and serologically related to, but distinct from, the following potyviruses: bean common mosaic (BCMV), bean yellow mosaic, cowpea aphid-borne mosaic (CAMV), dasheen mosaic, lettuce mosaic, tobacco etch, potato Y, soybean mosaic and watermelon mosaic-2. The intragel cross-absorption technique also was used to distinguish BlCMV from CAMV and BCMV. Five of 20 cowpea cultivars were resistant to BlCMV, whereas all 20 were susceptible to CAMV |
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