In addition, six genes were found to be upregulated in the clubroot-resistant line DH40R vs. DH199S throughout the entire infection stage, such as the hub gene BraA06g019050.3C (ARF2), which was highly expressed at 0, 2, 5, 8, 13, and 22 dai in DH40R. This evidence concerns the gene ZBP1 and infection.