Dual impact of elevated temperature on plant defence and bacterial virulence in Arabidopsis

Bethany Huot, Christian Danve M. Castroverde, André C. Velásquez, Emily Hubbard, Jane A. Pulman, Jian Yao, Kevin L. Childs, Kenichi Tsuda, Beronda L. Montgomery () and Sheng Yang He ()
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Bethany Huot: Michigan State University
Christian Danve M. Castroverde: Michigan State University
André C. Velásquez: Michigan State University
Emily Hubbard: Michigan State University
Jane A. Pulman: Michigan State University
Jian Yao: Western Michigan University
Kevin L. Childs: Michigan State University
Kenichi Tsuda: Max Planck Institute for Plant Breeding Research
Beronda L. Montgomery: Michigan State University
Sheng Yang He: Michigan State University

Nature Communications, 2017, vol. 8, issue 1, 1-12

Abstract: Abstract Environmental conditions profoundly affect plant disease development; however, the underlying molecular bases are not well understood. Here we show that elevated temperature significantly increases the susceptibility of Arabidopsis to Pseudomonas syringae pv. tomato (Pst) DC3000 independently of the phyB/PIF thermosensing pathway. 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 reveals a major temperature-sensitive node of SA signalling, impacting ~60% 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 defence and function of a central bacterial virulence system in the context of a widely studied susceptible plant–pathogen interaction.

Date: 2017
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DOI: 10.1038/s41467-017-01674-2

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