BIOL 220 Study Guide - Final Guide: Pattern Recognition Receptor, Ethylene, Phloem
Document Summary
What are two characteristics all induced defense systems have. There are different types of sensors in the plant"s membrane (pattern recognition receptors; prr). They are the receptors that tell the plant it has been attacked. Enzymes in the saliva of herbivores can bind to these receptors (herbivore associated molecular pattern; hamp) Damage associated molecular pattern; damp; when plant has been bitten. When the receptors are activated, they cause a signal cascade that increases calcium. This calcium coming in starts another signal cascade, which causes an increase in jasmonic acid and ethylene. In response to herbivory, ja and et accumulate within minutes in. Damaged and undamaged leaves of the eaten plant. Signal molecule (systemin) sent everywhere from damaged plant. Plants don"t make systemin, they make something called prosystemin. Once it"s moved into the phloem, it can go everywhere in the plant. plant gets eaten, an enzyme in the saliva will break prosystemin into systemin.
