H2O2 sulfenylates CHE, linking local infection to the establishment of systemic acquired resistance.
In plants, a local infection can lead to systemic acquired resistance (SAR) through increased production of salicylic acid (SA). For many years, the identity of the mobile signal and its direct transduction mechanism for systemic SA synthesis in initiating SAR have been debated. We found that in Arabidopsis thaliana, after a local infection, the conserved cysteine residue of the transcription factor CCA1 HIKING EXPEDITION (CHE) undergoes sulfenylation in systemic tissues, which enhances its binding to the promoter of the SA-synthesis gene ISOCHORISMATE SYNTHASE1 (ICS1) and increases SA production. Furthermore, hydrogen peroxide (H2O2) produced through NADPH oxidases is the mobile signal that sulfenylates CHE in a concentration-dependent manner. Accumulation of SA and the previously reported signal molecules, such as N-hydroxypipecolic acid (NHP), then form a signal amplification loop to establish SAR.
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Related Subject Headings
- Transcription Factors
- Signal Transduction
- Salicylic Acid
- Pseudomonas syringae
- Promoter Regions, Genetic
- Plant Diseases
- NADPH Oxidases
- Intramolecular Transferases
- Hydrogen Peroxide
- General Science & Technology
Citation
Published In
DOI
EISSN
ISSN
Publication Date
Volume
Issue
Start / End Page
Related Subject Headings
- Transcription Factors
- Signal Transduction
- Salicylic Acid
- Pseudomonas syringae
- Promoter Regions, Genetic
- Plant Diseases
- NADPH Oxidases
- Intramolecular Transferases
- Hydrogen Peroxide
- General Science & Technology