英德
有道
百度
谷歌
图片
维基
百科
凯氏带
casparian strip
- 摘要凯氏带是植物内皮层细胞径向壁和横向壁的带状增厚部分，近年来对其细微结构、化学成分、生理功能以及在植物体的存在部位等方而的研究工作已成为国内、外的研究热点。
Being the thickening of the radial and transverse walls of endodermal cells, Casparian snips are important contents of research at home and abroad, which often focus on the research of its structure, chemical component, function and distribution. - 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。
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 lo 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.
 |
 |
 |
 |
 |
 |
 |
中国词汇量第二的英语词典
更多精彩，登录后发现......
