中文摘要：

目的研究北柴胡茎、叶的个体发育过程。方法应用常规石蜡切片方法对北柴胡（Bupleu-rum chinense DC.）的茎尖、1年生和2年生茎以及叶进行了横向与纵向解剖观察。结果北柴胡茎的发育包括原分生组织、初生分生组织、初生结构和次生生长4个阶段。原分生组织由原套和原体组成,其衍生细胞形成初生分生组织。初生分生组织由原表皮、基本分生组织和原形成层组成。初生分生组织的衍生细胞分化形成茎的初生结构,包括表皮、皮层、维管束、髓和髓射线。随着茎的继续发育,维管形成层开始活动,由束中形成层产生次生韧皮部和次生木质部分子,而束间形成层仅产生薄壁细胞形成宽的射线。茎始终未产生周皮,而叶的发育包括原分生组织、初生分生组织和成熟结构3个阶段。北柴胡的叶为典型的异面叶,由叶片和叶柄两部分组成。分泌道在茎中主要分布在皮层和髓中,在叶中分布在维管束的上、下组织中,且这些分泌道均属初生分泌道。结论北柴胡茎、叶的个体发育过程,类似多年生草本双子叶植物茎、叶的一般发育过程。

英文摘要：

Aim To study the developments of Bupleurum chinense DC. stem and leaf. Methods Paraffin sectioning. Results The development of Bupleurum chinense DC. stems could be divided into four stages ： promeristem, primary meristem, primary structure and secondary growth stage. Promeristem was composed of two layers of tunica cells and a group of corpus cells, with the development of promeristem, the primary meristem including protoderm, procambium and ground meristem, formed at the apex of the shoot. The primary meristem differentiated into primary structure consisting of epidermis, vascular system, cortex and pith. With the progressive development of stem, the activity of vascular cambium began, the fascicular cambium differentiated into secondary xylem and secondary phloem, while the interfascicular cambium only differentiated into wide ray of parenchyma tissue. But the cork was not fount to form in the stem from beginning to end in its whole life. However, the development of Bupleurum chinense DC. leaves could be divided into three stages： promeristem, primary meristem and mature structures. The leaf of Bupleurum chinense DC. was the typical bifacial leaf composed of blade and stipe. The secretory canals mainly were distributed not only in the cortex and pith of the stems, but also in the tissues lying above and under the vascular bundles of the leaves. Moreover, they were all primary ones. Conclusion The developments of Bupleurum chinense DC. stem and leaf were similar to the general developmental laws of the etesiae dicotyledon＇s.