BIOL 1108 Lecture Notes - Lecture 11: Coevolution, Nicotine, Phenols
Document Summary
In the plant body: target for heterotrophs through predation (herbivores, disease) Threats lead to needs for defense: internal: physiological, chemical, external: first line of defense- cuticle, hairs, spines, etc, growth (think of grasses, biotic: recruiting ally such as ants. Threats lead to recognition which leads to a need for defense this all implies costs and hence trade-offs: the same process occurs in the predators too so there"s an arms race. Consequences for the plant: major economic and cultural consequences too. First line of defense= epidermis with its cuticle. How to breach this defense: finds gaps (2 kinds, opens the gate, break it down. Parasites feed on living (biotropic) or dead (necrotropic) cells. Some rely on the living cells to reproduce (use the cells machinery to replicate dna) Parasitic plants tap into the host plant"s tissue to retrieve water and minerals (heteroparasites) or also sugars (holoparasites) Threat defense system: virulent parasites death. Avirulent parasites: containment: containment response from plant recognition.
