OBJECTIVETo analyze the content of periplocin in different part of the Periploca sepium in vitro plantlet and study its dynamic variation during the process of differentiation.

METHODThe seeds were generated seedling under aseptic condition, and the cut hypocotyl was induced to form the callus and adventitious buds on the MS culture medium with the hormone of IBA 0.1 mg x L(-1) + BA 1 mg x L(-1). The seedling was cut down when the buds grew up to 3 cm and then the root was cultured in the 1/2 MS culture medium with the hormone of IBA 0.5 mg x L(-1) to form intact plantlet. Different parts of it were collected and the content of periplocin was measured during the process of differentiation.

RESULTThe contents of periplocin varied widely in different parts during the process of differentiation, with the highest in the roots and then callus, stem and leaf of intact plantlet, stem and leaf of plantlet without root from high to low.

CONCLUSIONThe periplocin of the secondary metabolite is more likely to be produced and accumulated in root and callus. Periplocin in stem and leaf is probably transported by conducting tissue.