39 - 39 Plant Responses to Damaging Organisms 39 Plant...

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39 Plant Responses to Damaging Organisms
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39 Plant Responses to Environmental Challenges How Do Plants Deal with Pathogens and with Herbivores? Pathogens evolve mechanisms to attack plants, plants evolve defenses against pathogens. Plants use both mechanical and chemical defenses.
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39.1 How Do Plants Deal with Pathogens? One of plant cell’s first lines of defense is to deposit more polysaccharides on the inside of the cell wall to reinforce this barrier. The polysaccharides block the plasmodesmata, and serve as a base for laying down lignin. Lignin is a mechanical barrier, and the precursors are toxic.
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Figure 39.1 Signaling between Plants and Pathogens
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39.1 How Do Plants Deal with Pathogens? Plants produce many kinds of defensive compounds. Phytoalexins are toxic to many fungi and bacteria. Most are phenolics or terpenes, and protect against herbivores as well. Also toxic plant cells
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Table 39.1 Secondary Plant Metabolites Used in Defense
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39.1 How Do Plants Deal with Pathogens? Enzymes from a pathogenic fungus
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39 - 39 Plant Responses to Damaging Organisms 39 Plant...

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