Albugo candidacausing white rust disease decreases the yield ofBrassica rapavegetables greatly. Resistant and susceptible cultivars inB. rapavegetables have different immune responses againstA. candidainoculation, however, the mechanism of how host plants respond toA. candidais still unknown. Using RNA-sequencing, we identified differentially expressed genes (DEGs) betweenA. candidainoculated [48 and 72 h after inoculation (HAI)] and non-inoculated samples in resistant and susceptible cultivars of komatsuna (B. rapavar.perviridis). Functional DEGs differed between the resistant and susceptible cultivars inA. candidainoculated samples. Salicylic acid (SA) responsive genes tended to be changed in their expression levels byA. candidainoculation in both resistant and susceptible cultivars, but different genes were identified in the two cultivars. SA-dependent systemic acquired resistance (SAR) involving genes were upregulated followingA. candidainoculation in the resistant cultivar. Particular genes categorized as SAR that changed expression levels overlapped betweenA. candidaandFusarium oxysporumf. sp.conglutinansinoculated samples in resistant cultivar, suggesting a role for SAR in defense response to both pathogens particularly in the effector-triggered immunity downstream pathway. These findings will be useful for understanding white rust resistance mechanisms inB. rapa.