sistemins
Systemins are plant peptide signals that coordinate systemic defense responses to wounding and herbivory. They are produced as part of larger precursor proteins, typically referred to as prosystemin, in damaged or nearby tissues and are processed into active peptide forms that can move to distant tissues to prime defenses.
The best characterized member is the tomato systemin, an 18‑amino‑acid peptide. Systemins belong to a family
Mechanistically, systemin activates the octadecanoid (jasmonic acid, JA) pathway. This leads to increased JA biosynthesis and
Ecologically, systemin signaling enhances plant protection against chewing herbivores and can influence neighboring plants and subsequent