Because the race-specific stem rust resistance gene Sr12 was previously mapped to the centromeric region of chromosome 3B [12, 29], it is possible that seedling resistance detected by race 98–1,2,(3),(5),6 corresponded to Sr12. The hypothesis was supported by testing the RL population at the seedling stage with the Canadian Pgt race MCCFR which is avirulent on Sr12. The parental lines RL90 and RL6058 showed infection types (IT) of “33+” and “;” respectively, and the susceptible and resistant progeny lines showed ITs of “33-” to “33+” and “;” to “12-” respectively. This evidence concerns the gene SLCO2A1 and infection.