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ICAR 2017 (June 20): Bethany Huot – Concurrent Session 2, Plant Defense & Biotic Interactions
June 20, 2017 @ 3:03 pm - 3:13 pm
Environmental conditions have profound effects on plant disease development; however, the underlying molecular bases are not well understood. We found that elevated temperature significantly increases the susceptibility of Arabidopsis to Pseudomonas syringae pv. tomato (Pst) DC3000 independent of major PIF proteins, which are implicated in thermosensing in Arabidopsis. Instead, elevated temperature promotes translocation of bacterial effector proteins into plant cells and causes a loss of ICS1-mediated salicylic acid (SA) biosynthesis. Global transcriptome analysis identified a major temperature-sensitive node of SA signalling in Arabidopsis, impacting approximately 70% of benzothiadiazole (BTH)-regulated genes, including ICS1 and the canonical SA marker gene, PR1. Remarkably, BTH can effectively protect Arabidopsis against Pst DC3000 infection at elevated temperature despite the lack of ICS1 and PR1 expression. Our results highlight the broad impact of a major climate condition on the enigmatic molecular interplay between temperature, SA defense and function of a central bacterial virulence system.