Wounding is a common stress factor which is caused by strong wind, hail and insect feeding. Responses to mechanical damage are either local or systemic. A local response occurs in the vicinity of the wound area and includes healing and repairing of tissues, as well as protection against invasion of pathogens. A systemic response occurs throughout the plant. Signals are mediated especially by jasmonic acid, abscisic acid, ethylene, reactive oxygen species, systemin and sugars.
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