Of the SIX genes identified in FOP1 EMR (SIX1, SIX6, SIX7, SIX9, SIX10, SIX11, SIX12, and SIX14), F81 (SIX1, SIX6, SIX9, SIX13, and SIX14), and R2 (SIX1, SIX6, and SIX13), the vast majority of those tested (SIX1 in FOP1 EMR was not tested) were expressed in planta, across the early stages of infection (8–96 hpi), following inoculation of pea seedlings (Figure 2). This evidence concerns the gene SIX1 and infection.