Figure 4

Fitness assay of parental MSV genomes and recombinant MSV viruses. The viability of recombinant viruses compared to that of their chimaeric parents, and the wild-type viruses MSV-MatA and MSV-VW. Recombinants recovered from MSV-sensitive plants (cv. Golden Bantam) after agroinoculation with the pair MatMPCPVW+VWMPCPMat (A) and MatMPCPLIRVW+VWMPCPLIRMat (B) were tested in moderately-resistant maize (cv. STAR 7714). Mean chlorotic leaf areas (and the 95% confidence intervals of these estimates indicated by error bars) observed on leaves 4, 5 and 6 of symptomatic plants. Shown in blue and pink on the genome schematic are regions derived from MSV-VW and MSV-MatA, respectively. The genome regions are as indicated in the legend of Figure 1.