Tomato roots exhibit distinct, development-specific responses to bacterial-derived peptides

Area of Science:

• Plant immunity
• Molecular biology
• Plant pathology

Background:

• Plants utilize cell-surface receptors to detect microbial patterns and trigger immune responses.
• Understanding pattern-triggered immunity (PTI) conservation across plant organs and species is vital for disease management.
• Current knowledge on PTI conservation in different plant organs and species is limited.

Purpose of the Study:

• To investigate the activation and immune response patterns of three pattern recognition receptors (PRRs) in tomato roots and leaves.
• To compare PTI responses across different developmental regions of tomato roots and between domesticated and wild tomato accessions.
• To elucidate the specificity and complexity of PRR signaling pathways in tomato root immunity.

Main Methods:

• Biochemical and genetic assays were employed to examine PRR activation and immune responses.
• Experiments were conducted on different developmental regions of roots and leaves of tomato (Solanum lycopersicum and S. pimpinellifolium).
• Analysis focused on three specific PRRs: SlFLS2, SlFLS3, and SlCORE.

Main Results:

• Tomato roots exhibited varying amplitudes and dynamics of immune responses across different accessions.
• All tested roots displayed developmental-specific PTI responses, with the early differentiation zone being most sensitive.
• Distinct yet overlapping downstream signaling pathway responses were observed for each PRR in tomato roots.

Conclusions:

• Each pattern recognition receptor (PRR) initiates a unique pattern-triggered immunity (PTI) pathway.
• The specificity and complexity of tomato root immunity are closely linked to developmental stage.
• Spatial and temporal regulation plays a critical role in plant defense mechanisms.