| Abstract: | Formation of Plantlets was achieved when stem apex of Pinellia ternata Brier. Cultured in vitro on MS medium with KT 0. 5 mg/L + NAA 0.2 mg/L (MSI). With petioles of the plantlet as explants callus could be induced after cultured for a week on MS medium with 2, 4-D 2.0 mg/L + KT 0.5 mg/L (MSII). Calli were subcultured once in every month. After 3--4 months a kind of friable calli could be selected, from which the tubercles could be differentiate and the plantlets formed when transfered onto MSI. But before callus differentiation, a lot of roots were formed on callus. The plantlets could be produced directly from the petiole segment. It was found that the stem growing tip was always covered by the leaf primordium and the former leaf primordium was covered by the latter leaf primordium during the differentiation of the apical bud of tubercle. The frenquency of plantlet differentiation from callus and petioles was over 70%. The rate of regeneration of plantlet on liquid static culture was twice as much as that on solid culture. All plantlets grew well after being transfered into the plot. The fresh weight of tuber-plant was 103 % higher than that of control (cultivated plant come from tubers). The alkaloid content of tubers come from tuberplant was 0. 344%, that of control was 0. 203% and 0. 264% for the wild tuber. |
