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Cross-protection studies between strains of sugarcane mosaic, maize dwarf mosaic, Johnsongrass mosaic, and sorghum mosaic potyviruses



Cross-protection studies between strains of sugarcane mosaic, maize dwarf mosaic, Johnsongrass mosaic, and sorghum mosaic potyviruses



Plant Disease 79(2): 135-138



Cross-protection was studied between strains of viruses comprising the sugarcane mosaic virus (SCMV) subgroup, namely Johnsongrass mosaic, maize dwarf mosaic, sorghum mosaic, and SCMV, in 53 different combinations using differential hosts and Western blot immunoassays. Cross-protection occurred only between SCMV-MDB and SCMV-BC when the former was inoculated first and the latter used as the challenge strain, but neither vice versa nor in any other combinations including the 19 that involved recognized strains of the one virus, SCMV. The unidirectional protection between SCMV-MDB and SCMV-BC and the negative cross-protection results between other strains of SCMV appear to correlate with different sequence motifs present in the hypervariable region of the coat protein N-terminus of the SCMV strains.

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