The phenylpropanoid metabolism was significently enhanced by the inducements of both the elicitor prepared from Phytophthora melonis and inducer (K

PO4) with increasing activities of PAL

4CL TAL and PO in culture callus of Cucumis melo L. The synthesis of lignin was also enhanced by the inducements. There were three band differences in resolving proteins of cultured callus among elicitor treatments and corresponding controls which was detected by polyacrylamide gel electrophgresis. The tiochemical mechanism of the different inducements between the elicitor and inducer was discussed.