Chapter 39- Plant Responses to Evironmental Challenges

Chapter 39- Plant Responses to Evironmental Challenges -...

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Ch. 39 Plant Responses to Environmental Challenges 39.1 Pathogens and Plants Plants seal off damaged tissue to limit damage - epidermis provides a physical barrier - cuticle is another physical barrier - plants seal off damaged portions of tissue to cut losses - works because plants are modular - can grow new modules - add polysaccharides on inside of cell wall to reinforce - can block plasmodesmata - adds ligin also as a physical barrier o ligin is toxic also Chemical Defenses - phytoalexins o toxic to pathogens o many are phenolics or terpenes - PR proteins (pathogenesis related proteins) signal other cells and other attack pathogens - cell wall detects pathogen, signals nucleus Hypersensitive Response is a localized Strategy - cell around infection site die - necrotic lesion isolates and contains what’s left of microbial infection - include salicylic acid Systemic Acquired Resistance is a Form of Long Term Immunity - systemic acquired resistance accompanied with synthesis of PR proteins - volatile compounds may invoke resistance in other plants
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This note was uploaded on 09/15/2009 for the course BIOE 20B taught by Professor Williams during the Spring '09 term at University of California, Santa Cruz.

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Chapter 39- Plant Responses to Evironmental Challenges -...

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