FIGURE 5.

Effects on CChMVd infectivity (indicated by the fraction of symptomatic plants within parentheses) of introducing separately two experimental quadruple mutations disrupting the proposed kissing-loop interaction, and concurrently the eight mutations restoring this interaction. Two experiment series (A, B) were performed. The structure of this region in viroid progeny from one symptomatic plant inoculated with the infectious CChMVd RNA containing eight mutations is shown below. Other details as in the legends to Figures 1 and 3.