狭叶柴胡各器官结构与其分泌道的分布规律

Structures of different organs of Bupleurum scorzonerifolium and the distribution law of secretory canals in different organs

关键词:  狭叶柴胡  器官  结构  分泌道  分布

Key words:  Bupleurum scorzonerifolium  organs  stucture  secretory canal  distribution

摘要:

采用石蜡切片法对狭叶柴胡全株不同器官的结构及各器官中分泌道的分布特征进行了解剖学观察研究。结果表明:(1)狭叶柴胡的主根从外向内由周皮、中柱鞘薄壁细胞环和次生维管组织组成,其中柱鞘薄壁细胞环是不同于一般双子叶植物根的一种结构; 茎从外到内由表皮、皮层和维管柱组成; 叶为等面叶,其上、下表皮内都具栅栏组织; 花主要由花瓣、雄蕊和雌蕊组成,雌蕊的花柱为实心型花柱,其基部膨大形成花柱基; 果实为双悬果。(2)在狭叶柴胡的根、茎、叶、苞片、花和果实中均有分泌道存在,但种子中没有。这些分泌道均分布在薄壁组织中,主要分布在维管束的韧皮部内,其营养器官与生殖器官中分泌道的上皮细胞的结构存在差异。

Abstract:

It is an observation and research on the structures of different organs of Bupleurum scorzonerifolium and the distribution law of secretory canals in different organs by paraffin section method. It's revealed that:Firstly,the taproot of B.scorzonerifolium was formed by periderm,pericyclic parenchyma tissue and secondary vascular tissue from the exterior to its interior,and the pericyclic parenchyma tissue was a structure which was different from the common structure of herbaceous plants in dicotyledon. The stem was composed of epidermis,cortex and vascular tissues from outside to inside; the leaf was bifacial,and there were palisades inside of the epidermis; the structure of flower was composed of petal,gynoecia and stamen; and the style of the gynoecia was solid and the basis of it bulged into stylar foot; the mericarp was double fruits. Secondly,there were secretory canals in root,stem,leaf,bractlet,flower and mericarp,but not in seed. The secretory canals were distributed in parenchyma tissue and mainly in phloem of vascular bundle,and the structures of secretory cells of secretory canals in vegetative and reproductive organs were different.