Infectivity of RYMV isolates with T49 or E49 and RB mutation *52Y after inoculation of rymv1-2 and rymv1-3 rice resistant cultivars.

1ratio of the number of plants infected over the number inoculated; percentage into brackets.2RB genotypes obtained after inoculation of WT isolates to rymv1-3 resistant plants.3RB genotype obtained after inoculation of the WT isolates to rymv1-2 resistant plants.4RB genotype constructed by directed mutagenesis of the infectious clone CIa.