Plant peptide signals

Matsubayashi, Y., Yang, H., Sakagaini, Y (2001) Peptide signals and their receptors in higher plants. Trends Plant Sci. 6, 573-577. 

Whereas systemin is a peptide signal involved in the regulation of plant defense responses [14,67], phytosulfokines appear to be the first true plant peptide growth regulators. They clearly display mitogenic... 

Plants do not only possess the tools for the perception of peptide signals, they also have enzymes potentially involved in the processing of peptide prohormones. The existence of such enzymes provides additional indirect evidence for a general role of peptide hormones in plant signal transduction processes. 

Tab. 15.1 Therapeutic antibodies produced in transgenic plants. See Fig. 15.1 for structures of the different antibodies and antibody fragments presented in the second column. Abbreviations TSP, total soluble protein FLW, fresh leafweight MSP, murine signal peptide SP, signal peptide KDEL, ER retention signal. In the column Expression + and - means respectively that the antibody was or was not expressed. 

In tomato and potato plants, two families of Pis have been identified that show wound-inducible expression. Within 48 h after wounding of leaves of these plants, up to 2% of leaf protein content is made up of protease inhibitors. Potato type I (Potl) inhibitors are not only expressed in wounded leaves but also in tissue of leaves away from the site of attack. ° This finding prompted the search for a hormone or inducing factor that carries the signal for enhanced inhibitor expression through the plant system. Systemin, an 18-residue peptide hormone, has since been reported to induce more than 15 genes of defense nature in tomatoes. ... 

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