Relative infectivities of the recombinant R4 and the parental clones TYX and TOX in tomato.

The infectivities were determined 30 days after co-inoculation of tomato plants with Tomato yellow leaf curl virus (TYX) and Tomato leaf curl Comoros virus (TOX) (A) or with TYX, TOX and recombinant R4 (B). Infectivity (number of infected plants/number of inoculated plants) was determined from four independent tests (1–4) comprising 30 to 45 plants each in (A) and 60 to 90 plants each in (B). In both graphs, the infectivity of TYX is arbitrarily set to 1 (blue line).