Journal
MOLECULAR PLANT-MICROBE INTERACTIONS
Volume 20, Issue 10, Pages 1192-1200Publisher
AMER PHYTOPATHOLOGICAL SOC
DOI: 10.1094/MPMI-20-10-1192
Keywords
avirulence; GH3; hypersensitive response; leaf spot disease
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Effector proteins injected by the pathogenic bacteria Pseudomonas syringae into plants can have profound effects on the pathogen-host interaction due to their efficient recognition by plants and the subsequent triggering of defenses. The AvrRpt2 effector triggers strong local and systemic defense (called systemic acquired resistance [SAR]) responses in Arabidopsis thaliana plants that harbor a functional RPS2 gene that encodes an R protein in the coiled-coil, nucleotide-binding domain, leucine-rich repeat class. The newly identified WO-T mutant shows greatly reduced resistance to R syringae carrying avrRpt2. In win3-T plants, RIN4 cleavage, an early AvrRpt2-induced event, is normal. However, salicylic acid accumulation is compromised, as is SAR induction and the local hypersensitive cell death response after infection by P syringae carrying avrRpt2. WIN3 encodes a member of the firefly luciferase protein superfamilly. Expression of WIN3 at an infection site partially requires PAD4, a protein known to play a quantitative role in RPS2-mediated signaling. WIN3 expression in tissue distal to an infection site requires multiple salicylic acid regulatory genes. Finally, win3-T plants show modestly increased susceptibility to virulent P syringae and modestly reduced SAR in response to P syringae carrying avrRpm1. Thus, WIN3 is a key element of the RPS2 defense response pathway and a basal and systemic defense component.
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