Interspecies Expression of an EF-HAND CALCIUM-BINDING PROTEIN in Leads to Reduced Virulence and Decreased Immune Evasion in Tomato Plants.

Many phytopathogenic bacteria require a type III secretion system (TTSS) to activate effector-triggered immunity (ETI). We identified a calcium-binding protein, EfhX, in the citrus pathogen subsp. that does not require a TTSS to activate reactive oxygen species (ROS) and elicit a hypersensitive reaction (HR) in tomato leaves following infection.