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Chapter 39: Plant Responses to Internal and External Signals Concept 39.5…

- - - - The first line of immune defense
      - depends on the plant's ability to recognize pathogen-associated molecular patterns (PAMPs), molecular sequences that are specific to certain pathogens
    - - The Hypersensitive Response
        
        seals off an infection and destroys both pathogen and host cells in the region
        
        Involves the production of enzymes and chemicals that impair the pathogen's cell wall integrity, metabolism, or reproduction
        
        Is part of a comlex defense
      - Systemic Acquired Resistance
        
        The resulting arise from the plant-wide expression of defense genes
        
        is a generalized defense response in organs distant from the infection site
      - stimulates the formation of lignin and the cross-linking of molecules within plant cell wall
      - responses hinder the spread of the pathogen to other parts of the plant