I recently had the opportunity to attend the annual Plant Biology 2026 meeting held from 18 to 22 July 2026 in Ottawa, Canada, and at this meeting, researchers from different parts of the world shared their discoveries ranging from fundamental cellular mechanisms to ecosystem-scale interactions. For the molecular plant-microbe interactions community, the meeting exhibited how dynamic, complex, and interconnected host–microbe communication truly is.
MPMI research spanned from cell-surface immune perception and specialized metabolic defense reprogramming to the multi-species complexity of host interfaces across several concurrent symposia.
Thematic Highlights
The plant-microbe interaction research showcase throughout the meeting covered both the evolutionary conservation and the intricate lineage-specific specialization of immune responses:
- CS8: Biotic: Plant Immunity Receptors, Signals, and Subcellular Programming
Chaired by IS-MPMI president, Jean T. Greenberg, this session showcased presentations on cell type-specific plastid responses to microbe-associated molecular patterns, how temperature affects plant immunity, diversity of NLR receptors in land plants, how plant viruses use lipid droplet biogenesis machinery to facilitate infection, and many other aspects of the plant-microbe interactions.
- CS9: Biochemistry Signals to Synthesis: Metabolic Control of Plant Defense, Symbiosis, and Bioactive Compound Production
This session was chaired by Alain Goossens and focused on unravelling the regulatory networks driving the biosynthesis of specialized defense metabolites, the metabolic trade-offs that balance immunity, symbiosis, and plant growth, including initial signaling events during plant-cyanobacterial symbiosis.
- CS20: Biotic: Plant Defense at Host Interfaces: Integrating Environmental Microbe Interactions
This session included, but was not limited to, talks on plant signaling in pathogenic and mutualistic microbes in various environments, such as how phosphoinositide signatures are modulated by mutualist-pathogen co-colonization, how effector-triggered stomatal immunity prevents leaf invasion by bacterial pathogens, how natural variation and elevated temperature affect plant leaf epidermal responses to microbes, and how endophytic fungi rewire flax stress pathways under cadmium. The session was chaired by Sebastian Schornack.
- CS27: Crossroads of Communication: Plants and Their Microbial Allies and Enemies
Chaired by two scientists, Virginia Miguel and Tia Harrison, researchers discussed their findings on proximity labeling to define the effector repertoires of intracellular plant pathogens and how CPK28 signaling can be used to engineer disease-resistant canola, and several other aspects of signaling during plant-microbe pathogenesis and co-operation.
Looking Ahead
The diversity of MPMI presentations at Plant Biology 2026 emphasizes how transcriptomic, metabolomics, chemical ecology, structural biology, and microbiome studies continue to push the boundaries of molecular plant-microbe interactions.
For the full program visit the Plant Biology 2026 Meeting Portal.