BI-1 is necessary for successful infection of barley (Hordeum vulgare L.)by the powdery mildew fungus Blumeria graminis, a non-killer (biotrophic) pathogen [21], whereas overexpression of BI-1 reduces plants' susceptibility to killer pathogens such as Fusarium graminearum and B. cinerea[22], [23]. Here, TMBIM6 is linked to infection.