摘要
对自然状态下南方红豆杉茎干向下萌生的气生不定根进行解剖学观察．结果表明：气生不定根具有以下结构特征和发育特点：（1）根为二原型，侧根正对着木质部发生；（2）幼根内皮层细胞具凯氏带加厚，维管柱内紧挨中柱鞘内侧具有2～4层大型薄壁细胞；（2）根中无髓和树脂道；（4）次生结构发生于根毛区，维管形成层由初生木质部和初生韧皮部之间的薄壁细胞转化形成；（5）中柱鞘和栓内层细胞富含单宁类物质；（6）次生韧皮部有石细胞，次生木质部射线发达．
The anatomical structure of the aerial adventitious roots of Taxus chinensis var. mairei, was investigated in this paper. We have observed the following characteristics of anatomical structure and development： （1） The primary roots belong to archetype and the lateral roots occur in the position toward the xylem of the vascular cylinder; （2）The root endodermis consists of thicken casparian strips, and there are from two to four layers parenchyma cells near the pericycle ; （3） the pith and resins canals are absent in the toots ; （4） Secondary structure occurs in the root hair zone, and vascular cambium is formed from the parenchyma cells between the primary xylem and primary phloem; （5）Tanning materials are abundant in pericycle cells and phelloderm cells; （6）Sclereids are found in secondary phloem, and rays are rather rich in secondary xylem.
出处
《海南大学学报（自然科学版）》
CAS
2007年第2期152-155,共4页
Natural Science Journal of Hainan University
基金
国家自然科学基金资助项目(39960018)
广西师范大学学科建设专项基金资助项目(XKY2006ZD04)
关键词
南方红豆杉
气生不定根
解剖结构
发育
Taxus chinensis var. mairei
aerial adventitious root
anatomical structure
development
