Loss-of-function alleles of MLO (Mildew Resistance Locus O) confer broad-spectrum resistance to foliar infections by powdery mildew pathogens. Like pathogens. microbes that establish mutually beneficial relationships with their plant hosts. trigger the induction of some defense responses. https://www.spidertattooz.com/WAC-4011-LED-Horizontal-Step-Light-Colorscaping/