BISC208 Lecture Notes - Lecture 8: Wilt Disease, Symbiosis, Parasitism
15 Mar 2019
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Document Summary
Cuticle of epidermis is first line of defense- wounds opportunity for pathogens. Can secrete a chemical that prevents stomata from closing. Can secrete enzymes that weaken the cell wall. Vascular system allows pathogens to move long distances. Necrotrophic- eating dead material, kill cells before colonizing them. They can be both broad or specific. Isolate certain portions of infected plants much more successfully than animals can. Send chemical signals to uninfected regions to increase defense and resistance. Basal receptors recognize molecules generated by broad class of pathogens. Causes nearby uninfected cells to rapidly produce reactive oxygen species causing cells to die. Creates barrier of dead tissues that prevents spread of biotrophic pathogens, slows growth. Plants can respond to the presence of xylem transported pathogens by plugging xylem conduits. If caught in time, this can prevent pathogens from spreading. It"s possible for the plant to block its xylem. Hairs are often armed with chemical irritant.
