TMEM37 and infection: We also investigated the defence response of wheat towards dead Pst. Dead spores slightly increased the expression of two pathogenesis-related genes, PR1 and PR2 (Supplementary Fig. 29)32,33, but pre-inoculation with dead spores did not significantly change Pst biomass after 12, 24 or 48 h of infection with viable spores (Supplementary Fig. 30, Supplementary Note 2).