Multi-Omics Revealed Molecular Mechanisms Underlying Guard Cell Systemic Acquired Resistance.
Lisa DavidJianing KangDaniel DufresneDan ZhuSixue ChenPublished in: International journal of molecular sciences (2020)
Systemic Acquired Resistance (SAR) improves immunity of plant systemic tissue after local exposure to a pathogen. Guard cells that form stomatal pores on leaf surfaces recognize bacterial pathogens via pattern recognition receptors, such as Flagellin Sensitive 2 (FLS2). However, how SAR affects stomatal immunity is not known. In this study, we aim to reveal molecular mechanisms underlying the guard cell response to SAR using multi-omics of proteins, metabolites and lipids. Arabidopsis plants previously exposed to pathogenic bacteria Pseudomonas syringae pv. tomato DC3000 (Pst) exhibit an altered stomatal response compared to control plants when they are later exposed to the bacteria. Reduced stomatal apertures of SAR primed plants lead to decreased number of bacteria in leaves. Multi-omics has revealed molecular components of SAR response specific to guard cells functions, including potential roles of reactive oxygen species (ROS) and fatty acid signaling. Our results show an increase in palmitic acid and its derivative in the primed guard cells. Palmitic acid may play a role as an activator of FLS2, which initiates stomatal immune response. Improved understanding of how SAR signals affect stomatal immunity can aid biotechnology and marker-based breeding of crops for enhanced disease resistance.
Keyphrases
- single cell
- induced apoptosis
- cell cycle arrest
- reactive oxygen species
- immune response
- fatty acid
- cell death
- dendritic cells
- stem cells
- endoplasmic reticulum stress
- gene expression
- signaling pathway
- escherichia coli
- single molecule
- cell proliferation
- cystic fibrosis
- genome wide
- toll like receptor
- pi k akt
- biofilm formation
- ms ms
- risk assessment