NPR1 and infection: Previously, it was reported that the npr1 mutant showed stronger HR than the WT after infection with P. syringae carrying AvrRpm1 (OD600 = 0.03 or 0.1), but exhibited a WT-like response to P. syringae carrying AvrRpt2 (OD600 = 0.03) (Rate and Greenberg, 2001).