FIG. 4.

Competition between ALS-CMV recombinant (ALS-2) and nonrecombinant (ALS-0) isolates upon mixed infection of tobacco and alstroemeria. Total RNA was extracted at various times in days (DPI) or weeks (WPI) postinoculation. (A) RNA gel blot assay using the probes used to produce Fig. 1; (B) products of RT-PCR of the isolated RNA with the primers described in the legend to Fig. 3.