百里香营养器官解剖结构的观察

Observation on Anatomical Structure of Vegetative Organs of Thyme

[目的]观察百里香营养器官的解剖结构。[方法]采用石蜡切片方法,在光学显微镜下观察百里香营养器官根、茎、叶的解剖结构。[结果]在光学显微镜下,百里香根的次生结构从外到内依次为周皮、韧皮部、维管形成层、木质部、维管射线。茎的次生结构从外到内依次为周皮、韧皮部、维管形成层、木质部和髓,髓位于茎的中心,全部由薄壁细胞组成。叶为典型的异面叶;表皮由一层紧密的形状不规则的表皮细胞组成,细胞外壁角质膜较厚;表皮上分布着较多的单细胞表皮毛;叶肉组织发达,栅栏组织由2层排列整齐的圆柱形细胞构成;海绵组织排列较为疏松。[结论]该研究为百里香的鉴别提供了理论依据。

[Objective]The aim was to observe the anatomical structure of vegetative organs of thyme.[Method] The anatomical structures of vegetative organs of root,stem and leaf from thyme were observed under the optics microscope by applying paraffin section technique.[Result]Under the optics microscope,the secondary structures of thyme root from the outer to inner were periderm,phloem,vascular cambium,xylem and vascular ray.The secondary structures of thyme stem from the outer to inner were periderm,phloem,vascular cambium,xylem and pith.The pith which was composed of parenchyma cells located in the center of stem.The leaf was a typical bifacial leaf;each epidermis consisted of a row of closely-arranged irregular epidermic cells and the horny layers of the cells were thick;single-cell richomes were distributed on the epidermis.The mesophyll was very rich,the palisade tissue was composed of 2 layers of cylindrical cells and the spongy tissue was arranged loosely.[Conclusion]The research provided theoretical basis for the identification of thyme.