Official title and information are available only for Plus and Premium subscribers.
Patent Granted Systemin is a plant peptide hormone involved in the wound response in the Solanaceae family. It was the first plant hormone that was proven to be a peptide having been isolated from tomato leaves in 1991 by a group lead by Clarence A. Ryan. Since then other peptides, with similar functions have been identified in tomato and outside of the Solanaceae.