| 摘要: |
| 植物根被组织是指存在于附生兰科植物、地生兰科植物、一些石蒜科、天南星科、薯蓣科以及百合科植物根部的典型适应性结构特征；成熟根被组织是由1~25层左右死细胞构成的白色鞘，其细胞壁多有螺旋式增厚，呈天鹅绒状或网状、羽毛状结构，具有海绵质地。该组织有六种应用于分类学特征的形态，依据这六种形态可将其分为12种类型；根被组织具有机械保护、保水、吸附营养物质等作用。通过对植物根被组织的分布、外部形态与类型、功能作用等方面研究，发现根被组织还需进一步探究的内容有：明确根被组织的概念，提供关于其功能作用的实验依据；研究根被组织的分布，提供更多数据从而引起对非附生兰科植物中根被组织研究的重视；探究非附生兰科植物中根被组织的发生过程。 |
| 关键词: 根被组织 分布 形态与类型 作用 |
| DOI：10.14188/j.ajsh.2022.01.002 |
| 分类号:Q945 |
| 基金项目:陕西省教育厅重点实验室科研计划项目 （18JS017） |
|
| A review of the studies on velamen radicum of epiphytic orchids |
|
CAO Xiaoyong, ZHANG Na, HU Xuanping, QIN Gongwei, WANG Bin, ZHANG Mengqi
|
|
School of Biological Science and Engineering， Shaanxi Sci-Tech University， Hanzhong 723000， Shaanxi， China
|
| Abstract: |
| Velamen radicum is identified as a typical adaptive structural feature of the roots of epiphytic orchids， terrestrial orchids， some Maryllidaceae plants， Araceae， Dioscoreaceae and Liliaceae. The mature root cover tissue is a white sheath composed of about 1~25 layers of dead cells， of which the cell walls are usually thickened in a spiral pattern， a velvety or reticulate， feathery structure with a spongy texture. The tissue has six morphologies applied to taxonomic teatures， which can be divided into 12 types， and the tissue has the functions of mechanical protection， water conservation and nutrient adsorption. Through the research of the distribution， external morphology and type， and function of velamen radicum， it is found that there are some aspects need to be further explored in the study of velamen radicum： to define the concept of the tissue to provide the experimental basis for the function， to study the distribution of the tissue to provide more data for the study of the tissue in non-epiphytic orchids， and to explore the process of the tissue development in non-epiphytic orchids. |
| Key words: velamen radicum distribution form and type function |
