Jasmonic acid is a hormone produced in plants that is made as a defensive response to necrotrophic pathogens, or pathogens that kill the host plant. It also stimulates an induction of anti-herbviroy responses. The anti-herbivory chemicals can only be produced in the presence of a wound, so after an insect or animal starts eating. Jasmonic acid is transported through plant vasculature, but it can also act locally, meaning that where the wound is will also produce anti-herbivory chemicals. Perception of JA is through the COI1 receptor, which is located inside the cell. Jasomic acid also stimulates the production of volatile signaling compunds, which can the prime other tissues and plants for attack by making them unpalatable, or bad-tasting. These volatiles are recognized by the insect or animal that eats them and turns them away from consuming the plant.
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