摘要
应用石蜡切片法和透射电镜法研究了不同发育时期的五味子根、茎和地下横走茎的解剖结构,旨在分析地下横走茎发育过程,探寻地下横走茎与根、茎在显微结构上的异同。结果显示:①五味子地上茎与地下横走茎在发育过程上有很多相似点,都有原生分生组织、初生生长和次生生长等3个阶段。但在初生生长的超微结构、茎尖形态和次生结构上也有明显差别;地上茎尖第1层细胞外有明显薄膜,核膜发育完整、质体多、液泡相对较少。地下茎茎尖相对于地上茎尖生长缓慢,液泡多,营养多以脂滴形式存在;地下茎尖呈弯钩状,次生维管组织在横切面上的比例较地上茎尖小。②五味子根次生结构包括周皮、次生韧皮部、形成层和次生木质部。在次生生长的过程中,根中央有未木质化的薄壁细胞。地下横走茎初生木质部发育方式属于内始式,从本质上不同于根的初生结构发育方式。
The anatomical structure of root, stem and rhizome of Schisandra chinensis （Turcz.） Baill were studied by using paraffin sections and transmission electron microscope, under the different development stages to analyze their developmental process to find the different microstructures of rhizome from root and stem. The results showed that： （~） the development pro- cess of rhizome was similar to stem which could be divided into three stages of promeristem, primary and secondary growth. However, those two were different in ultrastructure of primary growth, tip type and secondary structure. There was a special membrane clinging on the first layer cell of stem tip, and it was much more developed than rhizome tip with completed enve- lope, more plastids and less vacuoles, while the rhizome tip had more vacuoles and lipid droplets. There had other differences between the two tips, the rhizome tip was bendy, the proportion of secondary growth of rhizome was less than that of stem. （~） Secondary structure of root was composed of merisderm, cambium layer, secondary xylem and secondary phloem with the parenchyma cells of non-lignification during the secondary growth process. The developing patterns of primary structure of rhizome was endarch, which was different from that of root.
出处
《特产研究》
2012年第2期20-29,共10页
Special Wild Economic Animal and Plant Research
基金
吉林省科技发展计划项目(20100249)
关键词
五味子
根
地下横走茎
解剖结构
Schisandra chinensis （Turcz.） Baill
Root
Rhizome
Anatomical structure
