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Identifying And Characterizing Arabidopsis Jasmonate Signaling Components Manipulated By Pseudomonas Syringae, Neva Laurie-Berry

Arts & Sciences Electronic Theses and Dissertations

Jasmonate signaling is critical for susceptibility of Arabidopsis thaliana to the bacterial pathogen Pseudomonas syringae, as demonstrated by the reduced susceptibility of coil mutant plants. The infection responses of another jasmonate-insensitive mutant, jinl, had previously been unknown. This work demonstrates that susceptibility to P. syringae requires activity of the transcription factor JTN1/MYC2. Reduced susceptibility correlates with reduced sensitivity to the P. syringae phytotoxin coronatine, a molecular mimic of the endogenous jasmonate JA-Ile. The reduced susceptibility of jinl mutant plants correlates with increased salicylic acid (SA)-dependent signaling. Analysis of jinl plants carrying the sidl mutation, resulting in decreased S A synthesis …