以栽培和野生的三岛柴胡(Bupleurum falcatum)来研究木质化指数的地理变异以及木质化指数与柴胡皂甙含量的相关性。将柴胡木质化指数规定为木质化的木质部面积与根横截面面积之比。实验所用的3个栽培品种在日本的和歌山和北海道种植后,经组织学观察表明,靠近根顶端的木质化指数较高,靠近根尖的较低,而距顶端1.5～2.0cm之间的 The cultivated and wild Bupleurum falcatum was used to study the geographical variation of lignification index and the correlation between lignification index and saikosaponin content. Bupleurum woodiness index is defined as the ratio of lignified xylem area to root cross-sectional area. After the three cultivars were planted in Wakayama and Hokkaido in Japan, the histological observation showed that the lignification index near the root tip was higher, the root near the root tip was lower, and the distance from the tip of 1.5 ~ 2.0cm