Systemin

Systemin is a recently discovered plant hormone involved in wound response. It is unique from other plant hormones in that it is a peptide^[1].

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Systemin was first identified in tomato leaves. It was found to be an 18-amino acid peptide processed from the C-terminus of a 200-amino acid precursor, which is called prosystemin^[2].

Genes that presumably code for systemins (or prosystemins) also occur in potato, pepper, and black nightshade^[3]. But so far, systemin-like hormones have not been identified in species outside the Solanaceae family.

References

1. ^ [1]
2. ^ McGurl B, Pearce G, Orozco-Cardenas M, Ryan CA, Science 255 (1992) 1570–1573.
3. ^ Constabel CP, Yip L, Ryan CA, Plant Mol. Biol. 36 (1998) 55-62.