Innate Immunity Signaling in Plants

Erika Keshishian

Outline

• Toll-like receptors– Review– Animals vs. plants

• Plant defense– Hypersensitive Response• Phytoalexins

– Systemic Acquired Resistance

Toll-Like Receptors

Plant vs. Animal “TLRs”

How plants cope with pathogens

• Bacteria, viruses, fungi, invertebrates*– Pathogen-Associated Molecular Patterns, PAMPs– Pattern Recognition Receptors, PRRs

Remember, plants cannot move to avoid predators…

Nor can they swat them away…

Pathogen Defense

Pathogen Defense – Hypersensitive Response

Hypersensitive Response

Phytoalexins

Systemic Acquired Resistance

Systemic Acquired Resistance

Questions?