H2O2 sulfenylates CHE to activate systemic acquired resistance
Aziz Ul Ikram1, Huan Chen2, Jian Chen1
1International Genome Center, Jiangsu University, Zhenjiang 212013, China.
Trends in Plant Science
|January 1, 2025
Summary
Hydrogen peroxide (H2O2) acts as a mobile signal in plants, regulating salicylic acid (SA) biosynthesis. This discovery reveals how plants trigger systemic acquired resistance (SAR) in response to pathogens.
Area of Science:
- Plant biology
- Molecular plant pathology
- Biochemistry
Background:
- Salicylic acid (SA) is a crucial signaling molecule for systemic acquired resistance (SAR) in plants.
- The mobile signal regulating systemic SA biosynthesis remained unidentified.
Purpose of the Study:
- To identify the mobile signal that induces systemic salicylic acid biosynthesis.
- To elucidate the mechanism by which this mobile signal operates.
Main Methods:
- Investigated the role of hydrogen peroxide (H2O2) as a mobile signal.
- Examined the sulfenylation of CCA1 HIKING EXPEDITION (CHE) by H2O2.
- Assessed the induction of SA production in systemic tissues.
Main Results:
- Hydrogen peroxide (H2O2) was identified as the mobile signal.
- H2O2 directly induces SA production in systemic tissues.
- Sulfenylation of CHE by H2O2 is a key step in this signaling pathway.
Conclusions:
- Hydrogen peroxide acts as a mobile signal regulating systemic SA biosynthesis.
- This mechanism is critical for activating plant defense responses, specifically SAR.
- Findings provide new insights into plant immunity signaling.
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