The time point for analyzing induced PR1 gene expression (Fig. 4C) and SA levels (Fig. 4D) was 9 h (early response after infection), as values measured at this time point are known to show significant differences in signaling outputs between WT and ald1 plants (Song et al., 2004b; Cecchini et al., 2015a). The gene discussed is ABCD2; the disease is infection.