Abstract
Pluchea lanceolata (DC.) C.B. Clarke is a threatened native medicinal plant. Increasing the propagation of this plant will preserve the wild population and provide material for medicinal use. In vitro and field-collected shoots and leaves were tested for response to 2,4-dichlorophenoxyacetic acid (2,4-D) and thidiazuron (TDZ), for initiation of direct shoot regeneration (DSR), or direct somatic embryogenesis (DSE). Leaves and internodes collected from field-grown plants produced only callus, while in vitro–raised shoots exhibited DSR and DSE on Murashige and Skoog (MS) medium with 2,4-D and TDZ. Direct shoot regeneration occurred on medium with TDZ from internode and leaf segments obtained from in vitro–developed shoots. In vitro–grown shoots were rooted on half-strength MS medium with 2 mg L−1 indole-3-butyric acid and acclimatized. Survival in natural conditions was 62.5% for DSE and 79% for DSR plantlets.
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