Multi-Omics Revealed Molecular Mechanisms Underlying Guard Cell Systemic Acquired Resistance
Lisa David1,2, Jianing Kang1,2,3, Daniel Dufresne4
1Department of Biology, University of Florida, Gainesville, FL 32611, USA.
International Journal of Molecular Sciences
|December 30, 2020
Summary
Systemic Acquired Resistance (SAR) primes plant guard cells for enhanced immunity. This priming reduces pathogen entry by altering stomatal aperture and involves fatty acid signaling, like palmitic acid, activating immune receptors.
Area of Science:
- Plant immunity and molecular mechanisms
- Plant-microbe interactions
- Guard cell biology
Background:
- Systemic Acquired Resistance (SAR) enhances plant immunity after pathogen exposure.
- Guard cells recognize pathogens via pattern recognition receptors (e.g., FLS2).
- The effect of SAR on guard cell immunity remains unclear.
Purpose of the Study:
- To elucidate molecular mechanisms of guard cell response to SAR.
- To investigate how SAR primes stomatal immunity against bacterial pathogens.
Main Methods:
- Utilized multi-omics (proteins, metabolites, lipids) in *Arabidopsis*.
- Compared SAR-primed plants with control plants upon secondary pathogen exposure.
- Analyzed stomatal aperture and bacterial load.
Main Results:
- SAR-primed plants showed reduced stomatal apertures, limiting bacterial growth.
- Multi-omics identified guard cell-specific SAR components, including ROS and fatty acid signaling.
- Increased palmitic acid and its derivatives were found in primed guard cells, potentially activating FLS2.
Conclusions:
- SAR significantly alters guard cell function and stomatal immunity.
- Palmitic acid may act as a crucial signaling molecule in SAR-mediated stomatal defense.
- Findings can inform crop biotechnology and breeding for disease resistance.
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