The induction of callus and cell suspension cultures from younger leaves of Cam ptotheca acuminata was observed.Cell lines were selected with improved camptothecin production as 0.02%.

• 以喜树碱高含量的幼叶为材料，进行了愈伤组织的诱导和培养，并通过优良细胞系的筛选，使愈伤组织中喜树碱的含量提高到0.；02%25。