TMEM37 and infection: At 12 h post inoculation (h.p.i.), arlpk1-1 arlpk2-1 showed higher PR1 protein expression compared with Col-0 WT after infection with Pst (EV) and Pst (avrRpt2) (Fig. 4c), indicating that ARLPK1 and ARLPK2 are functionally redundant and negatively regulate plant immune responses.