狭叶柴胡根的发育解剖学研究  

Anatomical Study on Bupleurum scorzonerifolium Willd. Roots

作　　者：郑丽[1] 蔡霞[1] 胡正海[1] 

机构地区：[1]西北大学生命科学学院,西安710069

出　　处：《植物研究》2009年第6期659-664,共6页Bulletin of Botanical Research

基　　金：国家自然科学基金资助项目(30770122)

摘　　要：应用常规石蜡切片法对狭叶柴胡(Bupleurum scorzonerifolium Willd.)根的发育过程进行了解剖学研究,并对其1年生与多年生根的结构进行了比较。结果表明,狭叶柴胡根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个发育阶段。原分生组织由3群原始细胞组成,其细胞具有典型分生组织的细胞学特征;初生分生组织包括根冠原、表皮原、皮层原和中柱原。初生结构由表皮、皮层和中柱组成。初生木质部多为二原型,少数为三原型。次生结构为:从外到内由周皮、中柱鞘薄壁细胞环和次生维管组织组成,次生生长主要是依靠维管形成层和木栓形成层的活动来完成,其木栓形成层由中柱鞘细胞恢复分裂能力而形成。多年生根与一年生根的结构基本相似,但在各部分的细胞数量和组成上存在差异。分泌道在一年生的根中仅分布在中柱鞘薄壁组织中,而在多年生的根中,在中柱鞘薄壁细胞和次生韧皮部中均有分布。The development of Bupleurum scorzonerifolium Willd. root was studied with paraffin sectioning and the structure of the annual and the perennial taproots were compared and analyzed. It was shown that the development of B. scorzonerifolium root could be divided into four stages： promeristem, primary meristem, primary structure and secondary stages of growth. The promeristems consist of three groups of initial cells,which have the cytological characteristics of typical meristem cells;the primary meristems are composed of calyptrogens, primordial epidermises, periblems and pleromes. The primary structures include epidermis, cortex and stele. The primary xylem is diarch, triarch is few. The secondary structures include periderm, pericyclic parenchymna cycle and secondary vascular tissue, from the outside to the inside. The secondary growth mainly relies on the activities of vascular cambium and cork cambium; the cork cambium formed from pericyclic cells that resumed their dividing capabilities. The perennial root have the similar structure to the annual one, but there were some differences in the quantity of cells and structure of each parts. Secretory canals of annual root are only distributed in the pericyclic parenchymna, but they are distributed both in the pericyclic parenchymna and the secondary phloem in perennial roots.

关 键 词：狭叶柴胡 根 发育解剖 

分 类 号：Q944[生物学—植物学]