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Unformatted text preview: e. Parasitic Plants seeds i. Sources: soil f. Biotroph: Obligate parasite (needs host alive) g. Necrotroph: Kills host 3. How pathogens cause disease a. Toxins (necrotrophic) poisonous compounds produced by fungi and bacteria i. Toxins may produce disease symptoms 1. Active in low concentrations 2. Kill plant cells and allow pathogens to feed b. Growth regulators (biotrophic) compounds that regulate plant growth patterns i. Pathogens may produce hormones that stimulate or retard plant growth c. Plant disease suppressors compounds that suppress plant defense mechanisms d. Proliferation multiplication in host tissues disrupt normal cell function 4. Symptoms of Plant Diseases a. Necrosis collapse and death of plant cells leaving lesions/cankers/blights/etc. b. Hyperplasia/Hypertrophy Overgrowths of tissue c. Hypoplasia/Hypotrophy Undergrowth of tissue...
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- Fall '10