The abscisic acid signaling controls HrpN-induced drought tolerance in ArabidopsisHrpN, a protein produced by the plant pathogenic bacterium Erwinia amylovora, has been shown to stimulate plant growth and resistance to pathogens and insects. Here we report that HrpN activates abscisic acid (ABA) signaling to induce drought tolerance (DT) in Arabidopsis thaliana (L.) plants grown with water stress. Spraying wild-type plants with HrpN promoted stomatal closure, decreased leaf transpiration rate, increased moi...