Virulence characteristics of P. sojae wild-type strains P6497 and P7074 and Avr3a-transformed strains.

1Two wild-type strains (P6497 and P7074) and four transformed strains, either over-expressing Avr3aP6497 (-O3, -O4, and -O8) or silenced for expression of Avr3aP6497 (-S1) are shown.2A, avirulent; I, intermediate; V, virulent. Results from stem inoculation of light-grown plants, number of surviving plants/total plants shown in parenthesis. Fischer's exact test was performed to compare the outcome on Williams (rps) to that on the Rps3a and Rps5 isolines, for each strain; asterisks indicate significant difference (p